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Expired European patentEurope

Method of desensitizing hypersensitive dentin employing compositions containing potassium salts

EP 0187757 B1 · Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed January 24, 1985 and granted April 8, 1992. A European patent lasts at most 20 years from filing, so its term ended January 24, 2005.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by July 24, 2010.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJanuary 24, 1985
PublishedJuly 23, 1986
GrantedApril 8, 1992
Term endedJanuary 24, 2005
Application numberEP 85900916
Classification (CPC)A61P1/02 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJan 24, 1985PublishedJuly 23, 1986Patent grantedApril 8, 1992Term endedJan 24, 2005

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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