High frequency filter
CA 2197841 C · Owner: Miyazaki, Moriyasu · Inventors: Nishino, Tamotsu; Miyazaki, Moriyasu; Yoneda, Naofumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high frequency filter includes a dielectric plate 8 an outer conductor 9 formed on the one surface of the dielectric plate 8, a plurality of strip conductors 10a - 10d formed approximately in parallel on the other surface of the dielectric plate 8, a strip conductor 15 formed in a direction crossing the strip conductors 10a - 10d short-circuiting, portions 11 and 16 connecting the one ends of the strip conductors 10a - 10d and the strip conductor to the outer conductor 9, respectively, and further comprises a plurality of resonators 110a - 110d constructed by the strip conductors 10 a plurality of capacitors (gaps) 12 coupling the resonators to each other to be connected in series, …
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 February 18, 1997 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2019.
- 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.