Chemical vapor deposition silicon and silicon carbide having improved optical properties
CA 2058809 A1 · Owner: Taylor, Raymond L. · Inventors: Taylor, Raymond L.; Goela, Jitendra S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, The optical transmission of chemical vapor deposition-produced silicon is dramatically enhanced by annealing at temperatures in the range of from about 1300°C to about 1500°C. Chemical vapor deposited silicon carbide which, is not ordinarily transmitting of infrared light may be made, transmitting through annealing at temperatures in the range of from about 1800°C to about 2600°C.
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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 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 2014.
- 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.