A field-twisting waveguide junction
CA 2014161 C · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Lagerlof, Rolf Owe Esbjorn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A field-twisting waveguide junction for electromagnetic microwaves has a rectangle-like cross-section at one end thereof. This cross-section deviates from a true rectangular shape by, virtue of an inwardly projecting ridge. The other end of the, junction 20 has a rectangular cross-sectional shape and the, cross- section of a central section of the junction has an L-shape. The junction comprises sections in the illustrated, embodiment sip sections the cross-sectional shapes of which are changed step-wise between the sections. The width direction of the rectangular cross-section has the same directional sense as the height direction of the inwardly projecting ridge. The junction is intended …
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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 9, 1990 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2012.
- 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.