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Expired European patentEurope

Improved method of preparing an intermediate for the manufacture of bambuterol

EP 0456799 B1 · Applicant: AKTIEBOLAGET ASTRA

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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 November 29, 1990 and granted June 1, 1994. A European patent lasts at most 20 years from filing, so its term ended November 29, 2010.
  • 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 May 29, 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.
FiledNovember 29, 1990
PublishedNovember 21, 1991
GrantedJune 1, 1994
Term endedNovember 29, 2010
Application numberEP 91900394
Classification (CPC)C07C269/04

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedNov 29, 1990PublishedNov 21, 1991Patent grantedJune 1, 1994Term endedNov 29, 2010

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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