Waveguide phased array antenna apparatus
CA 2254748 A1 · Owner: Chen, Shuguang · Inventors: Chen, Shuguang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A phase shifter for controlling a phase of a propagating wave from a distributing waveguide to an array of radiating waveguides is disclosed. The phase shifter includes a distributed-constant line coupling the distributing waveguide to the radiating waveguide and a plurality of distributed-constant circuits each providing a different phase-shift characteristic. A micro machine switch selectively connects the distributed-constant circuits to the distributed-constant line depending on a control signal received from outside.
Read the whole patent
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 1, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2020.
- 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.