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Expired Canadian patentCanada

Magnesia partially-stabilized zirconia ceramics and process for making the same

CA 1313035 C · Owner: Sibold, Jack D. · Inventors: Sibold, Jack D.; Seegmiller, Brian; Wirth, David G.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A method for producing a magnesia partiallystabilized zirconia ceramics is provided. The method preferably consists of combining zirconium dioxide having a silica content of up to 0.5 weight percent with a magnesium-containing component. This mixture is then compacted, heated, and cooled at a controlled rate without aging, to form said zirconia ceramics.

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.

Why it's free to use

  • Granted January 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 27, 1988
GrantedJanuary 26, 1993
Term endedJanuary 26, 2010
Patent numberCA 1313035 C
Classification (IPC)F42B8/00 +1 more

Timeline

Timeline From CIPO dates

19891992199519982001200420072010Application filedApril 27, 1988Patent grantedJan 26, 1993Term endedJan 26, 2010

Sources & verification

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