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Expired European patentEurope

Heat-resistant positive photoresist composition, photosensitive substrate, and process for preparing heat-resistant positive pattern

EP 0502400 B1 · Applicant: NITTO DENKO 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 February 24, 1992 and granted September 17, 1997. A European patent lasts at most 20 years from filing, so its term ended February 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 August 24, 2017.
  • 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.
FiledFebruary 24, 1992
PublishedSeptember 9, 1992
GrantedSeptember 17, 1997
Term endedFebruary 24, 2012
Application numberEP 92103100
Classification (CPC)G03F7/039 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedFeb 24, 1992PublishedSep 9, 1992Patent grantedSep 17, 1997Term endedFeb 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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