Expired Canadian patentCanada
Composite waveguide coupling aperture having a thickness dimension
CA 1259401 A · Owner: Ems Technologies Canada, Ltd. · Inventors: Wood, Peter J.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite coupling aperture for coupling energy between two waveguides having a thickness dimension t perpendicular to the aperture-plane C H A R A C T E R I Z E D B Y a non-uniform cross-section along the thickness dimension.
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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
- Granted September 12, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 12, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 18, 1985
GrantedSeptember 12, 1989
Term endedSeptember 12, 2006
Patent numberCA 1259401 A
Classification (IPC)H01Q13/10 +2 more
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.