Surface acoustic wave device
CA 2234513 C · Owner: Ikada, Katsuhiro · Inventors: Ikada, Katsuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A surface acoustic wave device includes first and second SAW filters and first, second and third SAW resonators. The first SAW filter has first and second ends and a first pass band in a first frequency region, and the second SAW filter has first and second ends and a second pass band in a second frequency region which is lower than the first frequency region. The second end of the second SAW filter is connected to the second end of the first SAW filter in parallel to form a connection point. The first and second one-port SAW resonators are connected in series between the second end of the first SAW filter and the connection point, and have an antiresonant frequency higher than the …
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 April 9, 1998 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2020.
- 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.