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Expired European patentEurope

Reversible electrochemical cell using conjugated polymer as electrode-active material

EP 0167321 B1 · Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED

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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 June 17, 1985 and granted August 23, 1989. A European patent lasts at most 20 years from filing, so its term ended June 17, 2005.
  • 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 December 17, 2010.
  • 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.
FiledJune 17, 1985
PublishedJanuary 8, 1986
GrantedAugust 23, 1989
Term endedJune 17, 2005
Application numberEP 85304304
Classification (CPC)C08G61/02 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJune 17, 1985PublishedJan 8, 1986Patent grantedAug 23, 1989Term endedJune 17, 2005

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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