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Expired European patentEurope

Photographic emulsions and elements capable of forming direct-positive images

EP 0050558 B1 · Applicant: EASTMAN KODAK COMPANY (a New Jersey 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 October 14, 1981 and granted July 17, 1985. A European patent lasts at most 20 years from filing, so its term ended October 14, 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 April 14, 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.
FiledOctober 14, 1981
PublishedApril 28, 1982
GrantedJuly 17, 1985
Term endedOctober 14, 2001
Application numberEP 81401589
Classification (CPC)C07D215/12 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedOct 14, 1981PublishedApril 28, 1982Patent grantedJuly 17, 1985Term endedOct 14, 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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