Motion discontinuance detection system and method
Patent 4450351 Issued on May 22, 1984. Estimated Expiration Date: 
February 24, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 24, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2016036 3459961 Switch for controlling the operation of a light source in response to the presence of a moving person or object and in response to the magnitude of ambient light not provided by the light souce Patent #: 4305021 InventorAssigneeApplicationNo. 06/469467 filed on 02/24/1983US Classes:250/221, Controlled by article, person, or animal307/117, Light, heat, vibratory or radiant energy315/159, Electric switch controlled by the radiant energy responsive device315/360, TIME-CONTROLLED340/527, Time delay340/530, Capacitor362/276, Condition responsive362/802POSITION OR CONDITION RESPONSIVE SWITCHExaminersPrimary: Nelms, David C.Assistant: Westin, Edward P. Attorney, Agent or FirmInternational ClassesG01V 8/12 (20060101)G08B 13/194 (20060101) AbstractA motion detection system is disclosed which utilizes a lens or other imaging device to be responsive to motion in a particular field of view in a room, for example, and pass illumination to a photocell. The photocell or a screen in front thereof establishes image distortion so that there is a nonuniform electrical output from the photocell upon motion of objects in the given field of view. The nonuniform electrical output establishes pulses which are passed to a timer and continually resets the timer so long as there is motion detected. Upon discontinuance of any motion in the field of view, no further pulses are passed to reset the timer, and the timer times out to de-energize an electrical load. This may be an electrical lamp illuminating the field of view, or it may be an electric soldering iron or typewriter which is de-energized when the person has left the room. | |
