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Expired European patentEurope

Improved method for synthesis

EP 0533752 B1 · Applicant: Astra Aktiebolag

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Overview

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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 June 5, 1991 and granted January 28, 1998. A European patent lasts at most 20 years from filing, so its term ended June 5, 2011.
  • 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 December 5, 2016.
  • 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.
FiledJune 5, 1991
PublishedMarch 31, 1993
GrantedJanuary 28, 1998
Term endedJune 5, 2011
Application numberEP 91910929
Classification (CPC)C07D401/12

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJune 5, 1991PublishedMarch 31, 1993Patent grantedJan 28, 1998Term endedJune 5, 2011

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.