Method of making fused silica
CA 2062882 A1 · Owner: Corning Incorporated · Inventors: Truesdale, Carlton M.; Mclay, Robert E.; Dobbins, Michael S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to the production of high purity fused silica glass through oxidation and/or flame hydrolysis of a halide-free, organosilicon-R compound in vapor form having the following properties: (a) producing a gas stream of a halide-free siliconcontaining compound in vapor form capable of being converted through thermal decomposition with oxidation or flame hydrolysis to SiO2;, (b) passing said gas stream into the flame of a combustion burner to form amorphous particles of fused SiO2;, (c) depositing said amorphous particles onto a support; and, (d) either essentially simultaneously with said deposition or subsequently thereto consolidating said deposit of amorphous particles …
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 March 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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
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.