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Expired European patentEurope

Charging method for maintenance-free batteries with an immobilized electrolyte

EP 0308653 B1 · Applicant: VARTA Batterie Aktiengesellschaft

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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 August 19, 1988 and granted March 24, 1993. A European patent lasts at most 20 years from filing, so its term ended August 19, 2008.
  • 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 February 19, 2014.
  • 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.
FiledAugust 19, 1988
PublishedMarch 29, 1989
GrantedMarch 24, 1993
Term endedAugust 19, 2008
Application numberEP 88113473
Classification (CPC)H02J7/977

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedAug 19, 1988PublishedMarch 29, 1989Patent grantedMarch 24, 1993Term endedAug 19, 2008

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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