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Expired European patentEurope

Thermodevelopable diazotype materials containing an activator precursor releasing during heating a strong base

EP 0074950 B1 · Applicant: RHONE-POULENC SYSTEMES

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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 November 19, 1981 and granted March 26, 1986. A European patent lasts at most 20 years from filing, so its term ended November 19, 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 19, 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 19, 1981
PublishedMarch 30, 1983
GrantedMarch 26, 1986
Term endedNovember 19, 2001
Application numberEP 81903099
Classification (CPC)G03C1/61 +1 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedNov 19, 1981PublishedMarch 30, 1983Patent grantedMarch 26, 1986Term endedNov 19, 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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