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Expired European patentEurope

Bleach solution for colour photographic process

EP 0534086 B1 · Applicant: KONICA CORPORATION

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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 July 24, 1992 and granted March 25, 1998. A European patent lasts at most 20 years from filing, so its term ended July 24, 2012.
  • 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 January 24, 2018.
  • 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.
FiledJuly 24, 1992
PublishedMarch 31, 1993
GrantedMarch 25, 1998
Term endedJuly 24, 2012
Application numberEP 92112723
Classification (CPC)G03C7/42 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedJuly 24, 1992PublishedMarch 31, 1993Patent grantedMarch 25, 1998Term endedJuly 24, 2012

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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