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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 |
| 7385170 |
Ambient light suppression circuit for photodiode receiver applications |
Jun. 10, 2008 |
| 7381939 |
Optical cargo detection |
Jun. 3, 2008 |
| 7372571 |
Color sensing apparatus |
May. 13, 2008 |
| 7351947 |
System and method for ambient light sensor testing for an information handling system display |
Apr. 1, 2008 |
| 7180047 |
Eye-protection device having dual high voltage switching |
Feb. 20, 2007 |
| 7161135 |
Multi-stage sensor for an auto-darkening lens for use in welding and method |
Jan. 9, 2007 |
| 7026593 |
Eye-protection device having dual high voltage switching |
Apr. 11, 2006 |
| 7002480 |
Deposit detector and control device using it |
Feb. 21, 2006 |
| 6927385 |
Optical sensor and method of suppressing interference light therefor |
Aug. 9, 2005 |
| 6841772 |
Eye-protection device having dual high voltage switching |
Jan. 11, 2005 |
| 6815652 |
Low power phototransistor-based welding helmet providing reduced sensitivity to low intensity light and sharp phototransistor response to high intensity light |
Nov. 9, 2004 |
| 6580064 |
Background rejection circuit |
Jun. 17, 2003 |
| 6574425 |
Reflectometer |
Jun. 3, 2003 |
| 6483090 |
Glare protecting device and method of controlling thereof |
Nov. 19, 2002 |
| 6429416 |
Apparatus and method of controlling a gated power supply in an image intensifier with a micro-channel plate |
Aug. 6, 2002 |
| 6414298 |
Reduced smearing optronic transceiver |
Jul. 2, 2002 |
| 6317043 |
Perimeter monitoring system |
Nov. 13, 2001 |
| 6317200 |
Positional measurement with normalized signal processing |
Nov. 13, 2001 |
| 6222177 |
Electrochromic element driver with negative output resistance |
Apr. 24, 2001 |
| 6172353 |
System and method for measuring low power signals |
Jan. 9, 2001 |
| 6037580 |
Safety device for cooking appliance |
Mar. 14, 2000 |
| 6028516 |
Trigger circuit |
Feb. 22, 2000 |
| 5990628 |
Light level sensor for detecting the level of incident light and discriminating between natural and artificial light |
Nov. 23, 1999 |
| 5991467 |
Image reading apparatus containing light receiving transistors and switching transistors |
Nov. 23, 1999 |
| 5959291 |
Method and apparatus for measuring low power signals |
Sep. 28, 1999 |
| 5910653 |
Shelf tag with ambient light detector |
Jun. 8, 1999 |
| 5892240 |
Wafer sensing apparatus for sensing wafer insertion |
Apr. 6, 1999 |
| 5874731 |
Ambient light filter |
Feb. 23, 1999 |
| 5852292 |
Method of operating an optical light sensor |
Dec. 22, 1998 |
| 5763873 |
Photodetector circuit for an electronic sprayer |
Jun. 9, 1998 |
| 5747798 |
Photocell checker |
May. 5, 1998 |
| 5717484 |
Position detecting system |
Feb. 10, 1998 |
| 5710424 |
Multiple field of view detector with background cancellation |
Jan. 20, 1998 |
| 5705807 |
Photo detecting apparatus for detecting reflected light from an object and excluding an external light componet from the reflected light |
Jan. 6, 1998 |
| 5698845 |
Optical detection apparatus for detecting light interruption |
Dec. 16, 1997 |
| 5665961 |
Photoelectric switch for use with a machine control circuit |
Sep. 9, 1997 |
| 5665975 |
Optical detectior including an optical alignment block and method |
Sep. 9, 1997 |
| 5640006 |
Control circuit for a fail-safe multi-axis light beam type sensor |
Jun. 17, 1997 |
| 5600125 |
Compensation and status monitoring devices for fiber optic intensity-modulated sensors |
Feb. 4, 1997 |
| 5594238 |
Touchless switch which discriminates between motion intended to toggle the switch and other forms of motion |
Jan. 14, 1997 |
| 5567931 |
Variable beam detection using a dynamic detection threshold |
Oct. 22, 1996 |
| 5532472 |
Photoelectric switch monitoring the duration of pulsed light to prevent false signals due to ambient conditions |
Jul. 2, 1996 |
| 5516293 |
Gaming machine coin hopper coin sensor |
May. 14, 1996 |
| 5508511 |
Arrangement for and method of detecting an object in an area subject to environmental variations |
Apr. 16, 1996 |
| 5506715 |
Lighting system having a remotely controlled electric lamp and an infrared remote controller with improved infrared filter |
Apr. 9, 1996 |
| 5489983 |
Sensor for vehicle alignment system and apparatus using same |
Feb. 6, 1996 |
| 5481104 |
Photodetector circuit with actively damped tuned input |
Jan. 2, 1996 |
| 5473461 |
Wide dynamic range optical receiver |
Dec. 5, 1995 |
| 5449899 |
Apparatus and method for highlighting returns from optically augmented targets |
Sep. 12, 1995 |
| 5422716 |
Method for on-site measurement of strobe light intensity on aircraft |
Jun. 6, 1995 |
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