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European application, no grantEurope

Triarylmethane compounds and pressure sensitive recording material

EP 0486749 A1 · Applicant: HODOGAYA CHEMICAL CO., LTD.

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 April 11, 1991 and never granted as a European patent. Had it been granted, its 20-year term would have ended April 11, 2011.
  • 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 October 11, 2016.
  • 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.
FiledApril 11, 1991
PublishedMay 27, 1992
GrantedNever granted
Term endedApril 11, 2011
Application numberEP 91105774
Classification (CPC)C07C229/60 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 11, 1991PublishedMay 27, 1992Term endedApril 11, 2011

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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