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Expired European patentEurope

Process for the purification of caprolactam

EP 0022161 B1 · Applicant: BASF 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 May 21, 1980 and granted November 10, 1982. A European patent lasts at most 20 years from filing, so its term ended May 21, 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 November 21, 2005.
  • 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.
FiledMay 21, 1980
PublishedJanuary 14, 1981
GrantedNovember 10, 1982
Term endedMay 21, 2000
Application numberEP 80102814
Classification (CPC)C07D201/16

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMay 21, 1980PublishedJan 14, 1981Patent grantedNov 10, 1982Term endedMay 21, 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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