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Expired European patentEurope

Process for the preparation of 1,2-epoxy-5,9-cyclododecadiene

EP 0033763 B1 · Applicant: Degussa Aktiengesellschaft

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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 12, 1980 and granted August 31, 1983. A European patent lasts at most 20 years from filing, so its term ended November 12, 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 May 12, 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.
FiledNovember 12, 1980
PublishedAugust 19, 1981
GrantedAugust 31, 1983
Term endedNovember 12, 2000
Application numberEP 80106975
Classification (CPC)C07D303/04 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 12, 1980PublishedAug 19, 1981Patent grantedAug 31, 1983Term endedNov 12, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.