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Expired Canadian patentCanada

Metal denture base

CA 1320654 C · Owner: Nakano, Kazuyuki · Inventors: Shida, Yoshiaki; Kato, Isamu; Nishikawa, Tomio

CIPO record

Overview

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

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Abstract From the Canadian patent

A denture base of a pressure-formed superplastic alloy, plate, and a method of making a metal denture base includes, providing a superplastic alloy plate and a female die having a finishing surface, and pressure-forming the alloy plate on the finishing surface of the female die at a temperature where the alloy exhibits superplasticity.

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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 July 27, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 27, 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.
FiledOctober 7, 1987
GrantedJuly 27, 1993
Term endedJuly 27, 2010
Patent numberCA 1320654 C
Classification (IPC)A61C13/20 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedOct 7, 1987Patent grantedJuly 27, 1993Term endedJuly 27, 2010

Sources & verification

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