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Browse by Date |
| Patent Number |
Title Of Patent |
Date Issued |
| 4292521 |
Radiographic device and method for recovering information from over-exposed radiographs |
Sep. 29, 1981 |
| 4292520 |
Liquid scintillation spectrometry process and apparatus |
Sep. 29, 1981 |
| 4292519 |
Device for contact-free potential measurements |
Sep. 29, 1981 |
| 4292518 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
Sep. 29, 1981 |
| 4292517 |
Photo-optical keyboard providing tactile feel |
Sep. 29, 1981 |
| 4292516 |
Photo-optical keyboard having debris protection |
Sep. 29, 1981 |
| 4292515 |
Reconfigurable photo-electric keyboard having removable keys |
Sep. 29, 1981 |
| 4292514 |
Apparatus for, and method for, achieving a temperature compensation of an avalanche photodiode |
Sep. 29, 1981 |
| 4292513 |
Heat detector circuit |
Sep. 29, 1981 |
| 4292512 |
Optical monitoring photodiode system |
Sep. 29, 1981 |
| 4292511 |
Apparatus and method for reading an identifying label on an information record |
Sep. 29, 1981 |
| 4292510 |
Keyboard for a miniature calculator |
Sep. 29, 1981 |
| 4292509 |
Indicator for tape running direction and tape remnant amount |
Sep. 29, 1981 |
| 4292508 |
Trading system |
Sep. 29, 1981 |
| 4292507 |
Football statistic pegboard |
Sep. 29, 1981 |
| 4292506 |
Fuel pump computer price variator |
Sep. 29, 1981 |
| 4292505 |
Furnace for generating heat by electrical resistance |
Sep. 29, 1981 |
| 4292504 |
Expanded metal electric heating element with edge support |
Sep. 29, 1981 |
| 4292503 |
Split-band electric heater |
Sep. 29, 1981 |
| 4292502 |
Helicopter deicer control system |
Sep. 29, 1981 |
| 4292501 |
Pyrolytic oven with a variable heating speed |
Sep. 29, 1981 |
| 4292500 |
Modular, constructional heating unit |
Sep. 29, 1981 |
| 4292499 |
Electronic calcification indicator for flow heaters heated by PTC resistors |
Sep. 29, 1981 |
| 4292498 |
High voltage electrode steam boiler and electrode assembly therefor |
Sep. 29, 1981 |
| 4292497 |
Pulsed arc welding and surfacing apparatus |
Sep. 29, 1981 |
| 4292496 |
Vertical plate welding using double bevel joint |
Sep. 29, 1981 |
| 4292495 |
Welding torch weaving device |
Sep. 29, 1981 |
| 4292494 |
Electric spark building-up of metal on the working surface of rolls |
Sep. 29, 1981 |
| 4292493 |
Method for decomposing ozone |
Sep. 29, 1981 |
| 4292492 |
Seam welding of pipes |
Sep. 29, 1981 |
| 4292491 |
Wire electrode electric discharge machine with controlled electrical parameters |
Sep. 29, 1981 |
| 4292490 |
Electrical discharge machining power supply with digitally controlled on and off time and protec... |
Sep. 29, 1981 |
| 4292489 |
Tab heating and applying apparatus |
Sep. 29, 1981 |
| 4292488 |
Microwave oven door having a conformable screen |
Sep. 29, 1981 |
| 4292487 |
Method for initiating the float zone melting of semiconductors |
Sep. 29, 1981 |
| 4292486 |
Apparatus for delivery of melting rings and valves to an inductor heater |
Sep. 29, 1981 |
| 4292485 |
Lever switch with improved actuating member |
Sep. 29, 1981 |
| 4292484 |
Responsive device for a vehicle tire |
Sep. 29, 1981 |
| 4292483 |
Ignition switch with starter lockout |
Sep. 29, 1981 |
| 4292482 |
Circuit controller for anti-wrinkle control |
Sep. 29, 1981 |
| 4292481 |
Decorative applique and decorative faceplate assembly for push-button telephones |
Sep. 29, 1981 |
| 4292480 |
Method and apparatus for locating telephones |
Sep. 29, 1981 |
| 4292479 |
Separation and balance device for telephone exchanges |
Sep. 29, 1981 |
| 4292478 |
Interface circuits |
Sep. 29, 1981 |
| 4292477 |
Telephone set base for both wall and desk mounting |
Sep. 29, 1981 |
| 4292476 |
Speech channel switching networks suitable for use in combination with electronic key telephone ... |
Sep. 29, 1981 |
| 4292475 |
Expandable link telephone intercom system |
Sep. 29, 1981 |
| 4292474 |
Electronic key telephone system with bi-directional serial data stream station control |
Sep. 29, 1981 |
| 4292473 |
Loop supervision circuit |
Sep. 29, 1981 |
| 4292472 |
Electronic artificial larynx |
Sep. 29, 1981 |
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