Antenna assembly for radio circuit and method therefor
CA 2117561 C · Owner: Motorola, Inc. · Inventors: Moller, Paul John; Schwinghammer, Patrick Allen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nondirectional antenna assembly, and associated method for, a radio operative at high frequencies such as at frequencies of, approximately 1.8 Gigahertz. A first antenna portion formed of a, one-half wavelength, helical winding is supported at a distal side of a nonconductive whip. A second antenna portion comprised of a, helical winding supported at a proximal side of the nonconductive whip, and a one-quarter wave helical winding connected to radio, circuitry of the radio transceiver couples the first antenna portion to, the radio circuitry. Because the first antenna portion is positioned at a distal side of the nonconductive whip, shadowing occurring as a result of positioning the radio …
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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
- Filed December 29, 1993 and granted April 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 2015.
- 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.