Microwave antennas
CA 2085131 A1 · Owner: Collins, John L. F. C. · Inventors: Collins, John L. F. C.; Collins, John L. F. C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Various modifications and improvements are described relating to planar microwave antennas of the type formed from a plurality of moulded planar layers. The antennas comprise a first layer (10) forming an array of horn elements, and one or more underlying layers (12, 14) define guide channels (62 64) communicating with the, horn elements. The improvements include the following: the channels formed in the underlying layers are open-topped being closed, along the majority of their length by abutment with the lower surface of the previous layer; the surfaces of the channels and the horn elements being metallised; the abutting surfaces are formed with complementary locating ribs and grooves …
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 June 14, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 2013.
- 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.