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Expired European patentEurope

Density adjusting method in image recording

EP 0051978 B1 · Applicant: FUJI PHOTO FILM 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 4, 1981 and granted March 12, 1986. A European patent lasts at most 20 years from filing, so its term ended November 4, 2001.
  • 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 4, 2007.
  • 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 4, 1981
PublishedMay 19, 1982
GrantedMarch 12, 1986
Term endedNovember 4, 2001
Application numberEP 81305243
Classification (CPC)H04N1/407

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedNov 4, 1981PublishedMay 19, 1982Patent grantedMarch 12, 1986Term endedNov 4, 2001

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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