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Expired European patentEurope

Water soluble form of retinoids

EP 0056056 B1 · Applicant: THE UNITED STATES OF AMERICA as represented by the Secretary United States Department of Commerce

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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 July 21, 1981 and granted October 16, 1985. A European patent lasts at most 20 years from filing, so its term ended July 21, 2001.
  • 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 21, 2007.
  • 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 21, 1981
PublishedJuly 21, 1982
GrantedOctober 16, 1985
Term endedJuly 21, 2001
Application numberEP 81902165
Classification (CPC)C08B37/0021 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJuly 21, 1981PublishedJuly 21, 1982Patent grantedOct 16, 1985Term endedJuly 21, 2001

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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