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Expired European patentEurope

A method for preparing a thromboplastin reagent from cultured cells that is suitable for use in the prothrombin time test

EP 0538951 B1 · Applicant: Akzo Nobel N.V.

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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 October 20, 1992 and granted July 29, 1998. A European patent lasts at most 20 years from filing, so its term ended October 20, 2012.
  • 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 April 20, 2018.
  • 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.
FiledOctober 20, 1992
PublishedApril 28, 1993
GrantedJuly 29, 1998
Term endedOctober 20, 2012
Application numberEP 92203216
Classification (CPC)C07K14/745

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedOct 20, 1992PublishedApril 28, 1993Patent grantedJuly 29, 1998Term endedOct 20, 2012

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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