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Expired European patentEurope

Electrochemical cell having a safety vent closure and method for assembling same

EP 0049080 B1 · Applicant: UNION CARBIDE CORPORATION

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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 September 22, 1981 and granted May 21, 1986. A European patent lasts at most 20 years from filing, so its term ended September 22, 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 March 22, 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.
FiledSeptember 22, 1981
PublishedApril 7, 1982
GrantedMay 21, 1986
Term endedSeptember 22, 2001
Application numberEP 81304336
Classification (CPC)H01M50/342

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedSep 22, 1981PublishedApril 7, 1982Patent grantedMay 21, 1986Term endedSep 22, 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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