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Expired Canadian patentCanada

High purity bone mineral

CA 1339302 C · Owner: Ed Geistlich Soehne Ag Fuer Chemische Industrie · Inventors: Lussi, Heinz; Geistlich, Peter

CIPO record

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

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Abstract From the Canadian patent

The invention relates to an artificial bone mineral for use in medicine and to a process for preparing the same. The bone mineral has a crystal structure and mineral microstructure substantially the same as natural bone and thus permits physiologically controlled cell, mediated remodelling on implantation. The bone mineral however, has an organic impurity content below 150 parts per million. The bone mineral is produced by degrading and solubilizing degreased bone by heating with ammonia or a primary amine, and extracting the solubilized degradation products by washing with flowing water at temperatures below 60°C. If necessary the degrading and washing steps may be repeated to remove …

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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 August 19, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 19, 2014.
  • 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 30, 1989
GrantedAugust 19, 1997
Term endedAugust 19, 2014
Patent numberCA 1339302 C
Classification (IPC)A61L27/00 +2 more

Timeline

Timeline From CIPO dates

199019931996199920022005200820112014Application filedMay 30, 1989Patent grantedAug 19, 1997Term endedAug 19, 2014

Sources & verification

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