Method and apparatus for suppressing interference using active shielding techniques
CA 2331155 A1 · Owner: Bethea, Clyde George · Inventors: Bethea, Clyde George; Pernell, Timothy Lloyd; Franey, John Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus are disclosed for suppressing interference in a radio frequency (RF) communication system using active shielding techniques. An, opposing neutralizing signal is applied to actively neutralize stray signals in a microwave, communication environment. An interfering or stray signal is detected using a sensing, antenna, and the opposing neutralizing signal is generated in response thereto. The, opposing neutralizing signal is applied to a signal neutralizing shield to shield any desired, components or devices. The opposing neutralizing signal is approximately 180 degrees, out of phase, and of equal magnitude to the detected interfering signal. A phase, shifter/ …
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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 January 16, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 16, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2023.
- 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.