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Expired Canadian patentCanada

Nitride bonded silicon carbide composition and method of making same

CA 1202987 A · Owner: Dresser Industries Inc. · Inventors: Winkelbauer, Howard M.; Wang, Ke-Chin

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Abstract From the Canadian patent

Nitride Bonded Silicon Carbide Composition and Method of Making Same Abstract, This invention relates to a silicon nitride bonded silicon carbide shape and a method of making same from a batch including a small amount of carbon or carbon yielding material. The bonded shape when examined by Xray diffraction includes no silicon oxynitride and the shape has excellent resistance to alkali attack. The shape would have application for example, in the bosh lining of a blast furnace.

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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

  • Granted April 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 8, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 2, 1983
GrantedApril 8, 1986
Term endedApril 8, 2003
Patent numberCA 1202987 A
Classification (IPC)C04B35/56 +1 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedMay 2, 1983Patent grantedApril 8, 1986Term endedApril 8, 2003

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.