Sintered silicon carbide ceramic body of high electrical resistivity
CA 1267915 C · Owner: Kennecott Corporation · Inventors: Boecker, Wolfgang D.G.; Mcmurtry, Carl H.; Hailey, Laurence N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sintered silicon carbide body having a D.C. electrical resistivity of at least 108 Ohm cm at 25°C a density of at least 2.95 g/cm3 is formed upon sintering in a nitrogenous atmosphere at a temperature of about 2250°C or greater, a shaped body composed essentially of carbon or carbon source material an amount sufficient to provide up to 2.5 percent uncombined carbon; from about 0.4 to about 2.0 percent boron carbide up to 25 percent of temporary binder and a balance of silicon carbide which is predominately alpha-phase. The shaped body may additionally include other sintering aids such as BN or Al without destruction of desired high electrical resistivity.
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
- Granted April 17, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 2007.
- 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.