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Expired European patentEurope

A non-hydrous electrolyte lithium primary cell and a method for manufacturing manganese dioxide therefor.

EP 0373791 B1 · Applicant: MITSUI MINING & SMELTING CO., LTD.

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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 29, 1989 and granted April 27, 1994. A European patent lasts at most 20 years from filing, so its term ended November 29, 2009.
  • 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 29, 2015.
  • 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 29, 1989
PublishedJune 20, 1990
GrantedApril 27, 1994
Term endedNovember 29, 2009
Application numberEP 89312439
Classification (CPC)H01M4/131 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 29, 1989PublishedJune 20, 1990Patent grantedApril 27, 1994Term endedNov 29, 2009

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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