The Film & More Reference Primary Source Documents | Further Reading This complete list of Edison's patents is courtesy of The Thomas A. Edison Papers, a project sponsored by Rutgers University. To see this list organized by execution date, patent number, and subject, and to access PDF files of every one of the 1,093 patents, visit the site's Thomas Edison's Patents pages. This list is organized by patent number. No. Executed Applied Issued Patent Title 481. 10/17/83 10/18/83 02/12/84 293,432 Electrical Generator or Motor 198. 08/06/80 08/09/80 02/12/84 293,433 Insulation of Railroad-Tracks Used for Electrical Circuits 314. 12/05/81 08/07/82 02/12/84 293,434 Incandescent Electric Lamp 378. 07/07/82 08/14/82 02/12/84 293,435 Electrical Meter 155. 12/04/78 12/09/78 04/01/84 295,990 Type-Writer 306. 11/07/81 11/28/81 04/29/84 297,580 Electric-Arc Light 390. 09/12/82 09/22/82 04/29/84 297,581 Incandescent Electric Lamp 465. 06/25/83 06/29/83 04/29/84 297,582 Dynamo-Electric Machine 469. 07/27/83 10/10/83 04/29/84 297,583 Dynamo-Electric Machine 474. 08/08/83 10/10/83 04/29/84 297,584 Dynamo-Electric Machine 477. 09/14/83 10/10/83 04/29/84 297,585 Incandescing Conductor for Electric Lamps 478. 09/14/83 10/10/83 04/29/84 297,586 Electrical Conductor 484. 11/15/83 12/12/83 04/29/84 297,587 Dynamo-Electric Machine 184. 06/15/80 07/03/80 05/13/84 298,679 Method of Treating Carbons for Electric Lights 485. 11/15/83 12/12/83 05/20/84 298,954 Dynamo-Electric Machine 486. 11/15/83 12/12/83 05/20/84 298,955 Dynamo-Electric Machine 492. 01/05/84 01/24/84 05/20/84 298,956 Mode of Operating Dynamo-Electric Machines 369. 06/24/82 08/14/82 08/26/84 304,082 Electrical Meter 470. 07/27/83 10/10/83 08/26/84 304,083 Dynamo-Electric Machine 471. 07/27/83 10/10/83 08/26/84 304,084 Device for Protecting Electric-Light Systems from Lightning 487. 11/15/83 12/12/83 08/26/84 304,085 System of Electrical Distribution 491. 12/15/83 01/24/84 08/26/84 304,086 Incandescent Electric Lamp 493. 01/12/84 01/24/84 08/26/84 304,087 Electrical Conductor 394. 10/09/82 10/12/82 10/21/84 307,029 Filament for Incandescent Lamps 475. 08/08/83 10/10/83 10/21/84 307,030 Electrical Meter 482. 11/02/83 11/15/83 10/21/84 307,031 Electrical Indicator 497. 02/09/84 03/19/84 03/17/85 314,115 Chemical Stock Quotation Telegraph 308. 11/22/81 11/29/81 05/12/85 317,631 Incandescent Electric Lamp 410. 10/26/82 11/09/82 05/12/85 317,632 Incandescent Electric Lamp 411. 10/26/82 11/09/82 05/12/85 317,633 Incandescent Electric Lamp 466. 06/25/83 06/29/83 10/20/85 328,572 Commutator for Dynamo-Electric Machines 503. 09/12/84 10/02/84 10/20/85 328,573 System of Electric Lighting 504. 09/12/84 10/02/84 10/20/85 328,574 System of Electric Lighting 505. 09/12/84 10/02/84 10/20/85 328,575 System of Electric Lighting 509. 12/03/84 12/15/84 10/27/85 329,030 Telephone 522. 04/27/85 05/08/85 12/29/85 333,289 Telegraphy 523. 04/30/85 05/08/85 12/29/85 333,290 Duplex Telegraphy 524. 05/06/85 05/16/85 12/29/85 333,291 Way-Station Quadruplex Telegraphy 379. 07/07/82 08/14/82 01/26/86 334,853 Mold for Carbonizing 483. 11/10/83 11/13/83 03/02/86 337,254 Telephone 380. 07/07/82 08/14/82 04/06/86 339,278 Electric Railway 496. 02/08/84 04/05/84 04/06/86 339,279 System of Electrical Distribution 510. 12/09/84 12/15/84 04/27/86 340,707 Telephonic Repeater 513. 12/19/84 01/12/85 04/27/86 340,708 Electrical Signaling Apparatus 516. 01/02/85 10/14/85 04/27/86 340,709 Telephone-Circuit 261. 05/20/81 05/31/81 05/11/86 341,644 Incandescent Electric Lamp 450. 05/08/83 05/14/83 05/11/86 341,839 Incandescing Electric Lamp 501. 06/27/84 08/07/84 06/01/86 343,017 System of Electrical Distribution 514. 12/19/84 01/12/85 08/10/86 347,097 Electrical Signaling Apparatus 518. 01/12/85 10/14/85 08/24/86 348,114 Electrode for Telephone-Transmitters 520. 03/27/85 04/07/85 10/05/86 350,234 System of Railway Signaling 532. 12/28/85 01/13/86 10/05/86 350,235 Railway-Telegraphy 204. 08/11/80 08/27/80 11/02/86 351,855 Electric Lamp 541. 09/30/86 10/05/86 11/02/86 351,856 Incandescent Electric Lamp 413. 11/03/82 11/09/82 12/07/86 353,783 Incandescent Electric Lamp 445. 04/06/83 04/17/83 12/14/86 354,310 Manufacture of Carbon Conductors 302. 10/29/81 11/28/81 03/01/87 358,599 Incandescent Electric Lamp 318. 12/13/81 08/07/82 03/01/87 358,600 Incandescing Electric Lamp 393. 10/05/82 10/12/82 06/28/87 365,465 Valve-Gear 354. 06/03/82 08/07/82 06/28/87 365,509 Filament for Incandescent Electric Lamps 548. 11/22/86 11/29/86 07/05/87 365,978 System of Electrical Distribution 173. 01/28/80 02/05/80 08/30/87 369,280 System of Electrical Distribution 549. 11/22/86 12/06/86 09/06/87 369,439 System of Electrical Distribution 556. 12/10/86 12/16/86 09/06/87 369,441 System of Electrical Distribution 557. 12/16/86 12/22/86 09/06/87 369,442 System of Electrical Distribution 558. 12/16/86 12/27/86 09/06/87 369,443 System of Electrical Distribution 446. 04/06/83 04/17/83 09/20/87 370,123 Electric Meter 448. 04/12/83 04/20/83 09/20/87 370,124 Manufacture of Filaments for Incandescing Electric Lights 452. 06/01/83 06/07/83 09/20/87 370,125 Electrical Transmission of Power 453. 06/01/83 06/07/83 09/20/87 370,126 Electrical Transmission of Power 454. 06/01/83 06/07/83 09/20/87 370,127 Electrical Transmission of Power 455. 06/01/83 06/07/83 09/20/87 370,128 Electrical Transmission of Power 456. 06/01/83 06/07/83 09/20/87 370,129 Electrical Transmission of Power 457. 06/01/83 06/07/83 09/20/87 370,130 Electrical Transmission of Power 458. 06/01/83 06/07/83 09/20/87 370,131 Electrical Transmission of Power 535. 05/11/86 05/15/86 09/20/87 370,132 Telegraphy 561. 12/21/86 12/28/86 11/22/87 373,584 Dynamo-Electric Machine 130. 05/08/77 05/14/77 02/07/88 377,374 Telegraphy 566. 06/30/87 07/06/87 02/07/88 377,518 Magnetic Separator 517. 01/09/85 10/14/85 02/14/88 378,044 Telephone-Transmitter 312. 12/05/81 12/09/81 03/20/88 379,770 Incandescent Electric Lamp 335. 02/28/82 08/07/82 03/20/88 379,771 Regulator for Dynamo-Electric Machines 352. 05/22/82 08/07/82 03/20/88 379,772 System of Electrical Distribution 551. 11/26/86 12/06/86 03/27/88 379,944 Commutator for Dynamo-Electric Machines 563. 05/24/87 06/13/87 03/27/88 380,100 Pyromagnetic Motor 569. 09/13/87 09/23/87 03/27/88 380,101 System of Electrical Distribution 570. 09/14/87 09/23/87 03/27/88 380,102 System of Electrical Distribution 575. 11/22/87 11/26/87 05/08/88 382,414 Burnishing Attachment for Phonographs 579. 12/04/87 12/27/87 05/08/88 382,415 System of Electrical Distribution 578. 11/29/87 01/05/88 05/08/88 382,416 Feed and Return Mechanism for Phonographs 584. 01/30/88 02/04/88 05/08/88 382,417 Process of Making Phonogram-Blanks 586. 02/20/88 03/02/88 05/08/88 382,418 Phonogram-Blank 590. 03/03/88 03/08/88 05/08/88 382,419 Process of Duplicating Phonograms 580. 12/05/87 01/05/88 05/08/88 382,462 Phonogram-Blank 550. 11/24/86 11/29/86 06/19/88 384,830 Railway Signaling 573. 11/05/87 12/09/87 06/26/88 385,173 System of Electrical Distribution 576. 11/22/87 11/26/87 07/31/88 386,974 Phonograph 585. 02/02/88 02/06/88 09/11/88 389,369 Incandescing Electric Lamp 587. 02/20/88 03/02/88 10/02/88 390,462 Process of Making Carbon Filaments 502. 07/16/84 08/07/84 10/23/88 391,595 System of Electric Lighting 506. 09/24/84 10/02/84 10/23/88 391,596 Incandescent Electric Lamp 593. 04/28/88 05/07/88 11/27/88 393,462 Process of Making Phonogram-Blanks 594. 04/28/88 05/07/88 11/27/88 393,463 Machine for Making Phonogram-Blanks 595. 04/28/88 05/07/88 11/27/88 393,464 Machine for Making Phonogram-Blanks 602. 06/30/88 07/07/88 11/27/88 393,465 Method of Preparing Phonograph Recording-Surfaces 605. 07/14/88 07/17/88 11/27/88 393,466 Phonograph-Recorder 606. 07/14/88 07/17/88 12/04/88 393,966 Method of Recording and Reproducing Sounds 607. 07/14/88 07/17/88 12/04/88 393,967 Method of Recording and Reproducing Sounds 625. 10/31/88 11/05/88 12/04/88 393,968 Phonograph-Recorder 588. 02/20/88 03/02/88 12/04/88 394,105 Phonograph-Recorder 589. 02/20/88 03/02/88 12/04/88 394,106 Phonograph-Reproducer 435. 02/13/83 03/16/83 12/25/88 395,123 Circuit-Controller for Dynamo-Electric Machines 391. 09/16/82 09/22/82 01/08/89 395,962 Method of Manufacturing Electric Lamps 495. 01/22/84 04/05/84 01/08/89 395,963 Incandescent-Lamp Filament 592. 03/19/88 03/29/88 01/15/89 396,356 Magnetic Separator 619. 09/19/88 09/27/88 02/05/89 397,280 Phonograph Recorder and Reproducer 615. 08/31/88 09/15/88 02/12/89 397,705 Method of Winding Field-Magnets 620. 09/29/88 10/11/88 02/12/89 397,706 Phonograph 451. 05/08/83 05/14/83 02/26/89 398,774 Incandescent Electric Lamp 281. 08/11/81 08/25/82 03/26/89 400,317 Ore-Separator 598. 05/22/88 06/07/88 04/02/89 400,646 Phonograph Recorder and Reproducer 603. 06/30/88 07/07/88 04/02/89 400,647 Phonograph 613. 07/27/88 07/30/88 04/02/89 400,648 Phonogram-Blank 621. 09/29/88 10/11/88 04/02/89 400,649 Method of Making Phonogram-Blanks 622. 10/15/88 10/17/88 04/02/89 400,650 Method of Making Phonogram-Blanks 364. 06/12/82 08/07/82 04/16/89 401,486 System of Electric Lighting 329. 02/10/82 08/07/82 04/16/89 401,646 Incandescing Electric Lamp 285. 08/24/81 10/04/81 06/11/89 404,902 Electrical-Distribution System 540. 08/06/86 08/11/86 07/02/89 406,130 Manufacture of Incandescent Electric Lamps 533. 01/28/86 02/19/86 07/09/89 406,567 Telephone 623. 10/15/88 10/17/88 07/09/89 406,568 Phonograph 626. 01/10/89 01/19/89 07/09/89 406,569 Phonogram-Blank 629. 02/01/89 02/11/89 07/09/89 406,570 Phonograph 630. 02/01/89 02/11/89 07/09/89 406,571 Process of Treating Phonogram-Blanks 631. 02/01/89 02/11/89 07/09/89 406,572 Automatic Determining Device for Phonographs 632. 02/01/89 02/11/89 07/09/89 406,573 Automatic Determining Device for Phonographs 633. 02/01/89 02/11/89 07/09/89 406,574 Automatic Determining Device for Phonographs 634. 02/01/89 02/11/89 07/09/89 406,575 Automatic Determining Device for Phonographs 637. 02/01/89 02/16/89 07/09/89 406,576 Phonogram-Blank 235. 01/19/81 01/31/81 07/09/89 406,824 Electric Meter 387. 08/25/82 09/13/82 07/09/89 406,825 Electric Meter 404. 10/19/82 10/20/82 09/17/89 411,016 Manufacture of Carbon Filaments 447. 04/06/83 04/17/83 09/17/89 411,017 Carbonizing-Flask 536. 07/15/86 07/17/86 09/17/89 411,018 Manufacture of Incandescent Electric Lamps 539. 07/20/86 07/29/86 09/17/89 411,019 Manufacture of Incandescent Electric Lamps 552. 11/26/86 12/06/86 09/17/89 411,020 Manufacture of Carbon Filaments 638. 03/22/89 03/25/89 11/12/89 414,759 Phonogram-Blank 640. 03/22/89 03/30/89 11/12/89 414,760 Phonograph 647. 07/16/89 08/10/89 11/12/89 414,761 Phonogram-Blank 137. 08/16/77 08/22/77 02/04/90 420,594 Quadruplex Telegraph 526. 10/07/85 10/23/85 02/25/90 422,072 Telegraphy 528. 11/12/85 11/24/85 02/25/90 422,073 Telegraphy 529. 11/24/85 02/19/86 02/25/90 422,074 Telegraphy 508. 10/21/84 12/01/84 03/04/90 422,577 Apparatus for Speaking-Telephones 511. 12/09/84 12/15/84 03/04/90 422,578 Telephonic Repeater 512. 12/09/84 12/15/84 03/04/90 422,579 Telephonic Repeater 643. 06/15/89 07/02/89 03/11/90 423,039 Phonograph for Dolls or other Toys 272. 06/03/81 06/22/81 04/15/90 425,760 Measurement of Electricity in Distribution Systems 489. 11/20/83 11/22/83 04/15/90 425,761 Incandescent Lamp 591. 03/03/88 03/08/88 04/15/90 425,762 Cut-Out for Incandescent Electric Lamps 282. 08/20/81 11/15/81 04/15/90 425,763 Commutator for Dynamo-Electric Machines 644. 06/15/89 07/02/89 04/29/90 426,527 Automatic Determining Device for Phonographs 611. 07/14/88 07/30/88 06/17/90 430,274 Phonogram-Blank 617. 09/12/88 09/20/88 06/17/90 430,275 Magnetic Separator 628. 01/12/89 01/15/89 06/17/90 430,276 Phonograph 635. 02/01/89 02/11/89 06/17/90 430,277 Automatic Determining Device for Phonographs 641. 04/08/89 04/10/89 06/17/90 430,278 Phonograph 645. 06/15/89 07/02/89 06/17/90 430,279 Voltaic Battery 648. 07/20/89 07/29/89 06/17/90 430,280 Magnetic Separator 577. 11/22/87 11/26/87 06/17/90 430,570 Phonogram-Blank 399. 10/14/82 10/20/82 06/24/90 430,932 Manufacture of Incandescent Lamps 414. 11/03/82 11/09/82 06/24/90 430,933 Filament for Incandescent Lamps 467. 06/25/83 06/29/83 06/24/90 430,934 Electric-Lighting System 237. 02/03/81 02/21/81 06/24/90 431,018 Dynamo or Magneto-Electric Machine 192. 07/29/80 08/09/80 08/19/90 434,585 Telegraph-Relay 582. 01/21/88 01/30/88 08/19/90 434,586 Electric Generator 583. 01/21/88 01/30/88 08/19/90 434,587 Thermo-Electric Battery 653. 01/16/90 01/20/90 08/19/90 434,588 Magnetic Ore-Separator 656. 02/14/90 02/20/90 08/19/90 434,589 Propelling Mechanism for Electric Vehicles 274. 06/21/81 09/03/81 09/02/90 435,687 Means for Charging and Using Secondary Batteries 476. 09/14/83 09/19/83 09/02/90 435,688 Process of and Apparatus for Generating Electricity 530. 11/30/85 02/19/86 09/02/90 435,689 Telegraphy 616. 08/31/88 09/15/88 09/02/90 435,690 Method of Making Armatures for Dynamo-Electric Machines 661. 05/17/90 05/24/90 09/09/90 436,127 Electric Motor 498. 06/02/84 06/10/84 09/23/90 436,968 Method of and Apparatus for Drawing Wire 499. 06/02/84 06/10/84 09/23/90 436,969 Method of and Apparatus for Drawing Wire 664. 06/02/90 06/10/90 09/23/90 436,970 Apparatus for Transmitting Power 527. 10/07/85 10/23/85 09/30/90 437,422 Telegraphy 608. 07/14/88 07/17/88 09/30/90 437,423 Phonograph 624. 10/15/88 10/17/88 09/30/90 437,424 Phonograph 636. 02/01/89 02/11/89 09/30/90 437,425 Phonograph-Recorder 649. 07/20/89 08/10/89 09/30/90 437,426 Phonograph 654. 02/08/90 02/17/90 09/30/90 437,427 Method of Making Phonogram-Blanks 658. 04/29/90 05/05/90 09/30/90 437,428 Propelling Device for Electric Cars 659. 04/29/90 05/09/90 09/30/90 437,429 Phonogram-Blank 425. 11/28/82 12/08/82 10/14/90 438,298 Manufacture of Incandescent Electric Lamps 438. 02/17/83 03/16/83 10/14/90 438,299 Manufacture of Carbon Filaments 459. 06/01/83 06/07/83 10/14/90 438,300 Gage for Testing Fibers for Incandescent-Lamp Carbons 468. 06/25/83 06/29/83 10/14/90 438,301 System of Electric Lighting 472. 07/27/83 10/10/83 10/14/90 438,302 Commutator for Dynamo-Electric Machines 500. 06/02/84 06/10/84 10/14/90 438,303 Arc Lamp 507. 09/24/84 12/15/84 10/14/90 438,304 Electric Signaling Apparatus 519. 01/14/85 10/14/85 10/14/90 438,305 Fuse-Block 531. 12/22/85 02/19/86 10/14/90 438,306 Telephone 537. 07/15/86 07/17/86 10/14/90 438,307 Manufacture of Incandescent Electric Lamps 546. 11/09/86 12/06/86 10/14/90 438,308 System of Electrical Distribution 642. 04/25/89 05/11/89 10/14/90 438,309 Method of Insulating Electrical Conductors 657. 04/25/90 05/05/90 10/14/90 438,310 Lamp-Base 278. 07/01/81 08/30/81 10/28/90 439,389 Electric-Lighting System 366. 06/19/82 06/26/82 10/28/90 439,390 System of Electric Lighting 315. 12/05/81 08/07/82 10/28/90 439,391 Junction-Box for Electric Wires 384. 08/12/82 08/22/82 10/28/90 439,392 Electric-Lighting System 388. 08/25/82 09/13/82 10/28/90 439,393 Carbonizing-Chamber 651. 12/11/89 12/27/89 12/30/90 443,507 Phonograph 673. 09/12/90 09/15/90 01/13/91 444,530 Leading-In Wire for Incandescent Lamps 367. 06/19/82 06/26/82 02/17/91 446,666 System of Electric Lighting 296. 10/11/81 08/07/82 02/17/91 446,667 Locomotive for Electric Railways 355. 06/03/82 08/07/82 02/17/91 446,668 Electric-Arc Light 439. 02/17/83 03/16/83 02/17/91 446,669 Manufacture of Filaments for Incandescent Electric Lamps 383. 08/05/82 08/07/82 03/24/91 448,778 Electric Railway 538. 07/15/86 07/19/86 03/24/91 448,779 Telegraph 604. 06/30/88 07/07/88 03/24/91 448,780 Device for Turning Off Phonogram-Blanks 612. 07/16/88 07/30/88 03/24/91 448,781 Turning-Off Device for Phonographs 609. 07/14/88 07/17/88 04/21/91 450,740 Phonograph-Recorder 131. 05/31/77 06/02/77 05/26/91 452,913 Sextuplex Telegraph 132. 05/31/77 06/02/77 06/02/91 453,601 Sextuplex Telegraph 665. 07/05/90 07/30/90 06/09/91 453,741 Phonograph 542. 10/26/86 10/27/86 06/16/91 454,262 Incandescent-Lamp Filament 316. 12/05/81 08/07/82 06/23/91 454,558 Incandescent Electric Lamp 660. 05/06/90 05/24/90 06/30/91 454,941 Phonograph Recorder or Reproducer 666. 07/05/90 07/30/90 06/30/91 454,942 Phonograph 667. 07/05/90 07/30/90 07/21/91 456,301 Phonograph-Doll 669. 08/04/90 08/12/90 07/21/91 456,302 Phonograph 672. 09/06/90 09/10/90 08/11/91 457,343 Magnetic Belting 678. 11/17/90 11/21/90 08/11/91 457,344 Smoothing-Tool for Phonogram-Blanks 432. 01/13/83 01/22/83 09/22/91 459,835 Manufacture of Incandescent Electric Lamps 345. 05/19/82 05/26/82 09/29/91 460,122 Process of and Apparatus for Generating Electricity 679. 11/17/90 11/21/90 09/29/91 460,123 Phonogram-Blank Carrier 639. 03/22/89 03/25/89 11/03/91 462,540 Incandescent Electric Lamp 368. 06/19/82 06/28/82 12/08/91 464,822 System of Distributing Electricity 655. 02/08/90 02/17/90 12/15/91 465,250 Process of Extracting Copper Pyrites 705. 07/31/91 08/24/91 12/15/91 465,251 Method of Bricking Fine Ores 696. 03/20/91 03/26/91 12/29/91 465,970 Armature Connection for Motors or Generators 525. 05/14/85 05/23/85 12/29/91 465,971 Means for Transmitting Signals Electrically 650. 11/14/89 11/18/89 12/29/91 465,972 Phonograph 694. 03/04/91 03/23/91 12/29/91 465,973 Armature for Dynamos or Motors 543. 10/26/86 10/27/86 01/05/92 466,400 Cut-Out for Incandescent Lamps 346. 05/19/82 05/26/82 01/05/92 466,460 Art of Electrolytic Decomposition 562. 02/07/87 03/08/87 02/16/92 468,949 Converter System for Electric Railways 697. 03/20/91 04/04/91 02/16/92 468,950 Commutator-Brush for Electric Motors and Dynamos 479. 09/14/83 10/10/83 03/15/92 470,922 Manufacture of Filaments for Incandescent Lamps 567. 08/09/87 08/19/87 03/15/92 470,923 Railway-Signaling 571. 09/26/87 09/30/87 03/15/92 470,924 Electric Conductor 601. 06/21/88 07/02/88 03/15/92 470,925 Manufacture of Filaments for Incandescent Lamps 691. 02/04/91 02/24/91 03/15/92 470,926 Dynamo-Electric Machine or Motor 695. 03/04/91 03/26/91 03/15/92 470,927 Driving Mechanism for Cars 709. 07/31/91 08/25/91 03/15/92 470,928 Alternating-Current Generator 713. 08/28/91 10/01/91 03/15/92 470,929 Magnetic Separator 721. 10/08/91 10/10/91 03/15/92 470,930 Dynamo-Electric Machine 714. 08/28/91 10/01/91 03/22/92 471,268 Ore-Conveyer and Method of Arranging Ore Thereon 715. 08/28/91 10/01/91 04/05/92 472,288 Dust-Proof Bearing for Shafts 716. 08/28/91 10/01/91 04/12/92 472,752 Dust-Proof Journal-Bearing 717. 08/28/91 10/01/91 04/12/92 472,753 Ore-Screening Apparatus 127. 04/18/77 04/27/77 05/03/92 474,230 Speaking-Telegraph 134. 07/09/77 07/20/77 05/03/92 474,231 Speaking-Telegraph 534. 02/17/86 02/18/86 05/03/92 474,232 Speaking-Telegraph 618. 09/12/88 09/20/88 05/10/92 474,591 Process of Extracting Gold from Sulphide Ores 718. 08/28/91 10/01/91 05/10/92 474,592 Ore-Conveying Apparatus 720. 08/28/91 10/08/91 05/10/92 474,593 Dust-Proof Swivel Shaft-Bearing 698. 06/03/91 06/09/91 05/24/92 475,491 Electric Locomotive 699. 06/03/91 06/09/91 05/24/92 475,492 Electric Locomotive 700. 06/03/91 06/09/91 05/24/92 475,493 Electric Locomotive 701. 06/03/91 06/09/91 05/24/92 475,494 Electric Railway 365. 06/12/82 08/07/82 06/07/92 476,527 System of Electric Lighting 440. 02/17/83 03/16/83 06/07/92 476,528 Incandescent Electric Lamp 473. 07/27/83 10/10/83 06/07/92 476,529 System of Electrical Distribution 565. 06/01/87 06/04/87 06/07/92 476,530 Incandescent Electric Lamp 253. 04/22/81 04/26/81 06/07/92 476,531 Electric-Lighting System 722. 10/08/91 10/15/91 06/07/92 476,532 Ore-Screening Apparatus 564. 05/24/87 06/13/87 06/14/92 476,983 Pyromagnetic Generator 670. 08/09/90 08/28/90 06/14/92 476,984 Expansible Pulley 675. 10/27/90 11/21/90 06/14/92 476,985 Trolley for Electric Railways 692. 02/24/91 03/02/91 06/14/92 476,986 Means for Propelling Electric Cars 693. 02/24/91 03/02/91 06/14/92 476,987 Electric Locomotive 702. 07/31/91 08/14/91 06/14/92 476,988 Lightning-Arrester 703. 07/31/91 08/14/91 06/14/92 476,989 Conductor for Electric Railways 710. 07/31/91 08/25/91 06/14/92 476,990 Electric Meter 597. 05/09/88 05/21/88 06/14/92 476,991 Method of and Apparatus for Separating Ores 689. 01/20/91 01/24/91 06/14/92 476,992 Incandescent Electric Lamp 712. 07/31/91 10/01/91 06/14/92 476,993 Electric-Arc Lamp 515. 12/31/84 10/14/85 07/12/92 478,743 Telephone-Repeater 280. 07/26/81 12/06/81 07/19/92 479,184 Fac-simile Telegraph 99. 08/19/74 09/01/74 08/09/92 480,567 Duplex Telegraph 243. 03/02/81 03/12/81 09/13/92 482,549 Means for Controlling Electric Generation 711. 07/31/91 09/02/91 10/11/92 484,183 Electrical Depositing-Meter 544. 10/26/86 10/27/86 10/11/92 484,184 Manufacture of Carbon Filaments 559. 12/20/86 12/27/86 10/11/92 484,185 Manufacture of Carbon Filaments 581. 01/17/88 01/30/88 10/18/92 484,582 Duplicating Phonograms 662. 05/24/90 05/27/90 10/18/92 484,583 Phonograph Cutting-Tool 663. 05/24/90 05/27/90 10/18/92 484,584 Phonograph-Reproducer 668. 07/05/90 07/30/90 10/18/92 484,585 Phonograph 553. 12/06/86 12/15/86 11/08/92 485,615 Manufacture of Carbon Filaments 554. 12/06/86 12/15/86 11/08/92 485,616 Manufacture of Carbon Filaments 610. 07/14/88 07/17/88 11/08/92 485,617 Incandescent-Lamp Filament 706. 07/31/91 08/24/91 11/08/92 485,840 Method of Bricking Fine Iron Ores 726. 07/09/92 07/20/92 11/08/92 485,841 Method of Magnetically Separating Ores 727. 07/09/92 07/20/92 11/08/92 485,842 Method of Magnetic-Ore Separation 521. 03/27/85 04/07/85 11/22/92 486,634 System of Railway Signaling 600. 05/26/88 05/29/88 12/20/92 488,189 Phonograph 599. 05/22/88 06/07/88 12/20/92 488,190 Phonograph-Reproducer 627. 01/10/89 01/19/89 12/20/92 488,191 Phonogram-Blank 480. 10/09/83 11/01/83 01/31/93 490,953 Art of Generating Electricity 545. 11/02/86 11/06/86 01/31/93 490,954 Manufacture of Carbon Filaments for Electric Lamps 723. 11/10/91 11/12/91 02/21/93 491,992 Cut-Out for Incandescent Electric Lamps 724. 04/05/92 04/11/92 02/21/93 491,993 Stop Device 407. 10/19/82 10/26/82 02/21/93 492,150 Process of Coating Conductors for Incandescent Lamps 139. 08/31/77 09/05/77 03/07/93 492,789 Speaking-Telegraph 688. 12/20/90 01/19/91 03/14/93 493,425 Electric Locomotive 707. 07/31/91 08/24/91 03/14/93 493,426 Apparatus for Exhibiting Photographs of Moving Objects 671. 08/09/90 08/28/90 03/21/93 493,858 Transmission of Power 690. 02/04/91 02/09/91 04/25/93 496,191 Phonograph 719. 08/28/91 10/01/91 05/30/93 498,385 Roller for Crushing Ore or Other Material 614. 07/27/88 07/30/88 06/20/93 499,879 Phonograph 676. 10/27/90 11/21/90 06/27/93 500,280 Phonograph 680. 11/17/90 11/21/90 06/27/93 500,281 Phonograph 682. 12/01/90 12/03/90 06/27/93 500,282 Phonograph 574. 11/09/87 11/11/87 10/10/93 506,215 Method of Making Plate Glass 646. 06/29/89 07/02/89 10/10/93 506,216 Apparatus for Making Glass 729. 03/15/93 03/17/93 11/28/93 509,428 Composition Brick and Method of Making Same 488. 11/15/83 12/12/83 11/28/93 509,517 System of Electrical Distribution 704. 07/31/91 08/14/91 11/28/93 509,518 Electric Railway 133. 05/31/77 06/02/77 01/16/94 512,872 Sextuplex Telegraph 728. 08/24/92 08/29/92 01/23/94 513,096 Method of and Apparatus for Mixing Materials 730. 05/22/93 05/24/93 01/23/94 513,097 Phonograph 652. 12/11/89 12/27/89 03/23/94 513,095 Phonograph 293. 09/27/81 11/11/81 08/07/94 524,136 Regulator for Dynamo-Electric Machines 547. 11/09/86 12/06/86 08/14/94 524,378 System of Electrical Distribution 555. 12/06/86 12/15/86 08/28/94 525,007 Manufacture of Carbon Filaments 177. 03/10/80 03/20/80 09/11/94 525,888 Manufacture of Carbons for Electric Lamps 494. 01/22/84 01/28/84 09/18/94 526,147 Art of Plating One Material with Another 490. 12/15/83 01/04/84 02/12/95 534,206 Filament for Incandescent Lamps 560. 12/20/86 12/27/86 02/12/95 534,207 Manufacture of Carbon Filaments 596. 05/07/88 05/21/88 02/12/95 534,208 Induction-Converter 674. 09/13/90 09/17/90 02/12/95 534,209 Incandescent Electric Lamp 677. 10/27/90 11/21/90 07/02/95 541,923 Phonograph 681. 11/17/90 12/03/90 07/02/95 541,924 Phonograph 356. 06/03/82 08/07/82 08/06/95 543,985 Incandescent Conductor for Electric Lamps 401. 10/17/82 10/20/82 08/06/95 543,986 Process of Treating and Products Derived from Vegetable Fibers 402. 10/17/82 10/20/82 08/06/95 543,987 Filament for Incandescent Lamps 568. 08/26/87 08/29/87 08/27/95 545,405 System of Electrical Distribution 572. 10/17/87 10/21/87 07/07/96 563,462 Method of and Apparatus for Drawing Wire 725. 06/27/92 07/02/92 07/21/96 564,423 Process of Separating Ores 731. 12/13/93 12/19/93 09/08/96 567,187 Crushing-Roll 683. 12/01/90 12/03/90 01/12/97 575,151 Phonograph 708. 07/31/91 08/24/91 08/31/97 589,168 Kinetographic Camera 732. 12/13/93 12/19/93 04/12/98 602,064 Conveyer 734. 01/25/97 01/27/97 05/31/98 604,740 Governor for Motors 740. 06/10/97 06/29/97 06/14/98 605,475 Drying Apparatus 684. 12/01/90 12/03/90 06/14/98 605,667 Phonograph 741. 06/10/97 06/29/97 06/14/98 605,668 Mixer 735. 01/25/97 01/27/97 07/19/98 607,588 Phonograph 687. 12/06/90 12/15/90 08/16/98 609,268 Phonograph 685. 12/01/90 12/03/90 09/13/98 610,706 Phonograph go to page 3 Program Description | Enhanced Transcript | Reference The Film & More | Special Features | Timeline | Gallery | Teacher's Guide The American Experience | Kids | Feedback | Search | Shop | Subscribe ©  New content 1999-2000 PBS Online / WGBH