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European application, no grantEurope

Improved double layer energy storage device

EP 0093539 A2 · Applicant: THE STANDARD OIL COMPANY

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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 April 19, 1983 and never granted as a European patent. Had it been granted, its 20-year term would have ended April 19, 2003.
  • 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 October 19, 2008.
  • 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.
FiledApril 19, 1983
PublishedNovember 9, 1983
GrantedNever granted
Term endedApril 19, 2003
Application numberEP 83302224
Classification (CPC)H01M14/00 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedApril 19, 1983PublishedNov 9, 1983Term endedApril 19, 2003

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.