Microstrip antenna device
CA 2181887 C · Owner: Tsunekawa, Koichi · Inventors: Hagiwara, Seiji; Tsunekawa, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a microstrip antenna device which has a radiating patch 11 and a ground plate disposed opposite and in parallel to each other, a metal plate 21 is provided on the ground plate in the vicinity of at least one of opposite marginal edges of the radiating patch 11 in the direction of resonance to form an additional capacitance between an open end of the radiating patch in the direction of resonance and the ground plate, thereby permitting reduction of the antenna length.
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 March 8, 1996 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2018.
- 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.