Surface acoustic wave device and method for manufacturing the same
CA 2114334 C · Owner: Shikata, Shinichi · Inventors: Shikata, Shinichi; Higaki, Kenjiro; Nakahata, Hideaki
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 of the present invention comprises a hard layer comprising diamond or a diamond-like carbon film and a piezoelectric layer formed on the hard layer. It further comprises a pair of a interdigital transducer and a grounding electrode which perform an electro-mechanical conversion placed with the piezoelectric layer between. Then the feature of the present invention is to form the grounding electrode of a conductive oxide. It is preferred that the conductive oxide is formed by doping an impurity into piezoelectric material of ZnO namely. Therefore, the adhesive between the piezoelectric layer and the hard layer and the grounding electrodes is increased so that …
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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 January 27, 1994 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2016.
- 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
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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.