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Expired European patentEurope

Bis-(3-sulfopropyl)ethers, process for their preparation and their use as alkylating agents for organic bases

EP 0055428 B1 · Applicant: Agfa-Gevaert AG

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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 December 18, 1981 and granted March 14, 1984. A European patent lasts at most 20 years from filing, so its term ended December 18, 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 June 18, 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.
FiledDecember 18, 1981
PublishedJuly 7, 1982
GrantedMarch 14, 1984
Term endedDecember 18, 2001
Application numberEP 81110566
Classification (CPC)C07D293/12 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedDec 18, 1981PublishedJuly 7, 1982Patent grantedMarch 14, 1984Term endedDec 18, 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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