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Expired European patentEurope

Diastereomeric salts of malic acid and 2-amino-1-butanol and process for the scission of racemic malic acid

EP 0025841 B1 · Applicant: BASF Aktiengesellschaft

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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 July 30, 1980 and granted February 23, 1983. A European patent lasts at most 20 years from filing, so its term ended July 30, 2000.
  • 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 January 30, 2006.
  • 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.
FiledJuly 30, 1980
PublishedApril 1, 1981
GrantedFebruary 23, 1983
Term endedJuly 30, 2000
Application numberEP 80104499
Classification (CPC)C07C51/487

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJuly 30, 1980PublishedApril 1, 1981Patent grantedFeb 23, 1983Term endedJuly 30, 2000

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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