Direction finding apparatus
CA 1112342 A · Owner: Hollandse Signaalapparaten B.V. · Inventors: Langeraar, Huibert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio direction finding apparatus comprising an omnidirectional receiving element, an array of directional receiving elements two log video detectors suited for separate connection to two contiguous elements of said array and a subtraction circuit for generating a signal containing the azimuth data of an r.f. transmitter. In order to select echoes received through the main lobes of the two connected receiving element from those received through the main lobe of the one element and a side lobe of the other element, the radio direction finding apparatus is provided with a threshold circuit and two gate circuits separately inserted between the log video detectors and the subtraction circuit. …
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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 November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 1998.
- 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
Timeline From CIPO dates
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.