System for the detection of moving objects within a survey area by microwave diffraction
CA 1052884 A · Owner: Hansen, Hans B. · Inventors: Sorensen, Erik T.; Pontoppidan, Jorgen; Nielsen, Erik K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microwave transmitter and receiver are placed at a distance from each other to define between them a survey area in which the field of transmission ismodified by reflection and/or absorption by objects in the survey area. A modulation generator is used for controlling modulation in the transmitter and for controlling the cycling period of a commutative filter in the receiver in according with themodulation period thereby automatically tuning the receiver to the transmitter.The receiver further comprises an alarm unit which analyses the signal admitted through the commutative filter and strikes an alarm in response to such changes of that signal as are caused by the presence of moving …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.