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Expired Canadian patentCanada

Gold free palladium-silver alloys for dental prostheses

CA 1330475 C · Owner: Degudent Gmbh · Inventors: Hathaway, Doris; Schock, Gernot; Stumke, Manfred

CIPO record

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Abstract From the Canadian patent

Gold free palladium silver alloys for dental prostheses which can blend with dental ceramics without any change in colour and can be removed easily from the bed after casting containing 45 to 80% wt palladium, 7 to 50% wt silver 0 to, 5%-wt gold, 0 to 2% wt platinum, 0 to 5% wt tin 0 to 5% wt, indium, 0 to 3% wt zinc, 0 to 2% wt copper 0 to 1% wt, wolfram, molybdenum and/or tantalum 0 to 1% wt ruthenium, iridium and/or rhenium 0 to 7% wt gallium, 0 to 5% wt, cobalt and 0 to 3% wt germanium, of which the elements gallium, cobalt, and germanium, at least two are present at a content of 2 to 9%-wt in the alloy.

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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 5, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 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.
FiledFebruary 24, 1989
GrantedJuly 5, 1994
Term endedJuly 5, 2011
Patent numberCA 1330475 C
Classification (IPC)A61K6/04 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedFeb 24, 1989Patent grantedJuly 5, 1994Term endedJuly 5, 2011

Sources & verification

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