Polymeric hydridochlorosilazanes, process for their preparation, ceramic materials containing silicon nitride which can be manufactured therefrom, and their manufacture
CA 2004399 A1 · Owner: Gerdau, Thomas · Inventors: Bruck, Martin; Kleiner, Hans-Jerg; Vaahs, Tilo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Polymeric hydridochlorosilazanes, process for their preparation, ceramic materials containing silicon nitride which can be manufactured therefrom, and their manufacture, The invention relates to novel polymeric hydridochlorosilazanes, to their preparation, to their processing to form ceramic materials containing silicon nitride and to, said materials themselves. The polymeric hydridochlorosilazanes are prepared by reacting oligohydridoorganosilazanes of the general formula (R1SiHNH)n in which n is, about 3 to about 12, with at least one of the chlorosilanes R2SiHCl2, R3SiCl3, Cl2R4Si-CH2CH2-SiR4Cl2 or Cl3Si-CH2CH2-SiR5Cl2 at 30°C to 300°C, where the radicals independently of one another …
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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 December 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2011.
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