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Expired European patentEurope

Process for the preparation of beta-hydroxybutyric acid and its salts by means of hydrolysis of oligomers of beta-hydroxybutyric acid in a basic medium

EP 0266815 B1 · Applicant: SOLVAY & Cie (Société Anonyme)

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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 9, 1987 and granted March 6, 1991. A European patent lasts at most 20 years from filing, so its term ended October 9, 2007.
  • 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 9, 2013.
  • 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 9, 1987
PublishedMay 11, 1988
GrantedMarch 6, 1991
Term endedOctober 9, 2007
Application numberEP 87201935
Classification (CPC)C07C51/09

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedOct 9, 1987PublishedMay 11, 1988Patent grantedMarch 6, 1991Term endedOct 9, 2007

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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