Semiconductor strain sensor and manufacturing method thereof
CA 2024338 C · Owner: Imai, Masahito · Inventors: Narita, Ryoichi; Imai, Masahito; Maeda, Takushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor strain sensor comprising a substrate having a lead hole in which a lead terminal is installed so as to be electrically coupled to an external circuit and a sensor chip joined with the substrate and having piezo-resistors to a bridge circuit. A shell is joined with the front surface of the substrate by means of a projection welding technique after the back surface of the substrate is flattened, said sensor chip being covered by the shell and a space formed by the shell and the substrate being filled with a damping liquid. The substrate is integrally coupled to the sensor chip through an adhesive and spacers are, added to the adhesive so as to keep the thickness of the …
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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 August 30, 1990 and granted September 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2012.
- 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.