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Class Information
Number: 250/221
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Controlled by article, person, or animal
Description: Subject matter in which the optical path between the light source and the photocell is directly affected by an object which is movable with respect to, is not part of and is not continuously associated with the photocell device.










Sub-classes under this class:

Class Number Class Name Patents
250/222.1 Inanimate article 508


Patents under this class:
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Patent Number Title Of Patent Date Issued
6523417 End of line seat function and motion tester Feb. 25, 2003
6525306 Computer mouse with integral digital camera and method for using the same Feb. 25, 2003
6518561 User detection circuit with environmental light detector Feb. 11, 2003
6518565 Sensor assembly Feb. 11, 2003
6504143 Device for inputting data Jan. 7, 2003
6498338 Device and method for automatically milking cows Dec. 24, 2002
6492633 Optical scanning-type touch panel Dec. 10, 2002
6492634 Optical monitor for sudden infant death syndrome Dec. 10, 2002
6492650 Sensor unit for use in a multiple sensor unit array Dec. 10, 2002
6492775 Pre-fabricated stage incorporating light-actuated triggering means Dec. 10, 2002
6489603 Method for calibrating a photoelectric cell Dec. 3, 2002
6489605 Device to aid the orientation of blind and partially sighted people Dec. 3, 2002
6486463 Computer input device with encoders having flexible shafts and conical rollers Nov. 26, 2002
6483102 Method and apparatus for inspection of misplaced integrated circuits in a tray stack Nov. 19, 2002
6479823 Apparatus and method for lens adjustment Nov. 12, 2002
6474860 Alignment of optical interfaces for data communication Nov. 5, 2002
6476375 Optical sensor for pointing device with conical disks and single photodetector Nov. 5, 2002
6476376 Two dimensional object position sensor Nov. 5, 2002
6464554 Non-mechanical contact trigger for an article Oct. 15, 2002
6465770 Device for positioning objects Oct. 15, 2002
6455839 Obstacle detection sensor using synchronous detection Sep. 24, 2002
6456095 Generator interior cooling gas monitor and monitor system Sep. 24, 2002
6452155 Obstruction detection system and method having an alternating signal representative of a velocity of an object Sep. 17, 2002
6448548 Vehicle signal control module and system Sep. 10, 2002
6444973 Method and apparatus for improving the accuracy of a region-based light detector Sep. 3, 2002
6441361 Mounting bracket for product sensor Aug. 27, 2002
6441362 Stylus for optical digitizer Aug. 27, 2002
6441363 Vehicle occupant sensing system Aug. 27, 2002
6441364 Learned behavior optical power source controller Aug. 27, 2002
6437314 Coordinate input pen, and electronic board, coordinate input system and electronic board system using the coordinate input pen Aug. 20, 2002
6437315 Radiation-based contactless position reference system and method for elevators Aug. 20, 2002
6437317 Method and apparatus for inspecting cigarette heads Aug. 20, 2002
6433329 Optical position sensor with threshold updated dynamically by interpolation between minimum and maximum levels of output signal Aug. 13, 2002
6429420 Reversing aid Aug. 6, 2002
6420693 Foreign object insertion detector device Jul. 16, 2002
6420694 Steerable retroreflective system and method Jul. 16, 2002
6420704 Method and system for improving camera infrared sensitivity using digital zoom Jul. 16, 2002
6421045 Snap-on lens carrier assembly for integrated chip optical sensor Jul. 16, 2002
RE37777 Switch apparatus requiring the hand of the operator to activate the switch by breaking a light beam Jul. 2, 2002
6414293 Optical position sensing device and method using a contoured transparent sheet Jul. 2, 2002
6414603 Method for displaying state of multi-optical-axis photoswitch and multi-optical-axis photoswitch adapted to the method Jul. 2, 2002
6411215 Optical methods for detecting the position or state of an object Jun. 25, 2002
6406348 Musical drinks vessels Jun. 18, 2002
6402521 Apparatus for demonstrating changes in motion with respect to time Jun. 11, 2002
6403945 Device and method for detecting and distinguishing shelf-forming supports in cassettes and disk-shaped objects deposited thereon Jun. 11, 2002
6392222 Machine system having optical endpoint control and associated method May. 21, 2002
6392223 Tilt sensing device and method for its operation May. 21, 2002
6392539 Object detection apparatus May. 21, 2002
6386390 Automatic soap dispenser May. 14, 2002
6388246 System and method for detecting underwater objects having a shifted frequency May. 14, 2002

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