Tandem cavity thermal compensation
CA 2121744 C · Owner: Bennett, Richard L. · Inventors: Kich, Rolf; Bennett, Richard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plural cavity structure (10), suitable for use as a microwave filter (34, 34A, 34B), has plural cavities (24, 26, 28, 30) disposed within a cylindrical aluminum housing (12) and having a central planar transverse wall (18) including an iris (38) for coupling of electromagnetic power between two successive ones of the cavities (28 26), the transverse planar wall being centrally located in the case of the four-cavity structure. Additional transverse walls (14 16, 20, 22) are, constructed as discs and serve as end walls of the cavities and, in the case of the inboard discs the discs are provided with apertures (36 40) to, serve as coupling irises for coupling electromagnetic power between …
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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 April 20, 1994 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2016.
- 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.