Expired Canadian patentCanada
Alumina - zirconia ceramics reinforced with silicon carbide whiskers having a protective coating thereon and methods of making the same
CA 1331879 C · Owner: Hale, Thomas E. · Inventors: Hale, Thomas E.; Jun, Choll K.; Exner, Edward L.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ceramic composites containing a matrix of alumina and zirconia reinforced with silicon carbide whiskers, said composite coated with a material which is non-reactive with the workpiece.
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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 September 6, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 6, 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.
FiledJanuary 16, 1989
GrantedSeptember 6, 1994
Term endedSeptember 6, 2011
Patent numberCA 1331879 C
Classification (IPC)C04B35/80 +2 more
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.