Silicon carbide fibre and production thereof
CA 2000221 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Clegg, William J.; Birchall, Jame D.; Clegg, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
ICI Case No. QM 34939, ABSTRACT, "SILICON CARBIDE FIBRE AND PRODUCTION THEREOF" A silicon carbide fibre, which may have a mean crystallite size of greater than 500A, in which the silicon carbide constitutes greater than 90% by weight of the fibre, and in which the fibre is substantially homogeneous across a transverse section of the fibre. The fibre may be produced by a process which comprises forming a fibre from a homogeneous mixture comprising particulate silicon carbide dispersed in a solution of an organic polymeric material in a liquid medium and, heating the fibre at elevated temperature in order to decompose the organic polymeric material and to sinter the particles of silicon …
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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 October 5, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2011.
- 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.