| |
 |
|
Class Information
Number: 250/214B
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controlled circuit > Special photocell or electron tube circuits > Ambient light desensitizing means
Description:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4897538 |
Light pulse detecting system with highly reduced false alarm rate, usable for laser detection |
Jan. 30, 1990 |
| 4855590 |
Infrared touch input device having ambient compensation |
Aug. 8, 1989 |
| 4850692 |
Semiconductor light position detector for rangefinder |
Jul. 25, 1989 |
| 4851689 |
Photodetecting circuit |
Jul. 25, 1989 |
| 4840069 |
Electro-optic space positioner with background compensator |
Jun. 20, 1989 |
| 4821338 |
Optical signal receiving apparatus with compensation for peripheral light |
Apr. 11, 1989 |
| 4799044 |
Phototransistor apparatus with current injection ambient compensation |
Jan. 17, 1989 |
| 4778986 |
Electric control arrangement for use in object detecting system with high and low intensity light |
Oct. 18, 1988 |
| 4743856 |
Digital optical receiver circuit |
May. 10, 1988 |
| 4736097 |
Optical motion sensor |
Apr. 5, 1988 |
| 4724312 |
Proximity detection and warning system having a light pulse sensor and circuit responsive only to particular select frequencies |
Feb. 9, 1988 |
| 4713534 |
Phototransistor apparatus with current injection ambient compensation |
Dec. 15, 1987 |
| 4708482 |
Method and apparatus for measuring wear in the lining of refractory furnaces |
Nov. 24, 1987 |
| 4707689 |
Adaptive thresholding scheme for optically-based touch screens |
Nov. 17, 1987 |
| 4694182 |
Hand held bar code reader with modulated laser diode and detector |
Sep. 15, 1987 |
| 4681432 |
Photo-electric converting device |
Jul. 21, 1987 |
| 4672189 |
Device for sensing light and providing electrical readout |
Jun. 9, 1987 |
| 4645919 |
Photosensitive motion detector apparatus |
Feb. 24, 1987 |
| 4629877 |
Photo-electric conversion device |
Dec. 16, 1986 |
| 4601574 |
Distance measuring apparatus |
Jul. 22, 1986 |
| 4531078 |
Control circuit for electronic flash |
Jul. 23, 1985 |
| 4518253 |
Distance measurement system |
May. 21, 1985 |
| 4464048 |
Laser rangefinders |
Aug. 7, 1984 |
| 4443057 |
Automatic rearview mirror for automotive vehicles |
Apr. 17, 1984 |
| 4436427 |
Photoelectric measurement of moving filamentary material |
Mar. 13, 1984 |
| 4434363 |
Photoelectric switching apparatus |
Feb. 28, 1984 |
| 4425031 |
Automatic focus adjusting apparatus for camera |
Jan. 10, 1984 |
| 4419012 |
Position measuring system |
Dec. 6, 1983 |
| 4417148 |
Photodetector device for detecting the front and rear ends of a moving sheet |
Nov. 22, 1983 |
| 4388528 |
Photoelectronic apparatus |
Jun. 14, 1983 |
| 4366378 |
Laser light detection system |
Dec. 28, 1982 |
| 4319133 |
Photoelectric detection system |
Mar. 9, 1982 |
| 4315159 |
Optical sensor device with reduction of ambient light effects |
Feb. 9, 1982 |
| 4306500 |
Optical backscatter reduction technique |
Dec. 22, 1981 |
| 4276472 |
Detector for Q-switched laser radiation |
Jun. 30, 1981 |
| 4274735 |
Distance measuring device |
Jun. 23, 1981 |
| 4243879 |
Touch panel with ambient light sampling |
Jan. 6, 1981 |
| 4240727 |
Focussing system |
Dec. 23, 1980 |
| 4241456 |
Remote-controlled receiver |
Dec. 23, 1980 |
| 4227076 |
Optical position determining or tracking device |
Oct. 7, 1980 |
| 4219737 |
Self regulating microfilm frame detection circuit |
Aug. 26, 1980 |
| 4174177 |
False target warning system |
Nov. 13, 1979 |
| 4166948 |
Seed sensor |
Sep. 4, 1979 |
| 4162052 |
Night guidance of self-propelled missiles |
Jul. 24, 1979 |
| 4156134 |
Remote control device for operation by radiation |
May. 22, 1979 |
| 4143264 |
Highway line detector |
Mar. 6, 1979 |
| 4128760 |
Ambient light compensating circuit |
Dec. 5, 1978 |
| 4115006 |
Arrangement for detecting light sources |
Sep. 19, 1978 |
| 4109114 |
Programmable phonograph device |
Aug. 22, 1978 |
| 4097731 |
Automatic gain control for photosensing devices |
Jun. 27, 1978 |
|
|
|
