Apparatus and method for electronic polarization correction
CA 2179210 C · Owner: At&T Ipm Corp. · Inventors: Blodgett, James Russell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a cross-polarization cancellation apparatus and method particularly useful in a frequency reuse system including a dual-polarized, receiving system that receives a first electromagnetic signal having frequencieswithin a given frequency channel which signal is transmitted from an external source at a first polarization. The receiving system also receives a second signal having frequency components within the given frequency channel which was transmitted at a second, different polarization. Received cross polarized energy of the second signal is cancelled by employing an antenna for receiving the first and second signals and for providing first and second antenna output signals …
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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 June 17, 1996 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2018.
- 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.