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Expired European patentEurope

Process for the purification of 2,6-dimethylnaphthalene and its use in the production of 2,6-naphthalenedicarboxylic acid

EP 1151981 B1 · Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.

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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 January 29, 1997 and granted August 18, 2004. A European patent lasts at most 20 years from filing, so its term ended January 29, 2017.
  • 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 July 29, 2022.
  • 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.
FiledJanuary 29, 1997
PublishedNovember 7, 2001
GrantedAugust 18, 2004
Term endedJanuary 29, 2017
Application numberEP 01115667
Classification (CPC)C07C7/14 +2 more

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedJan 29, 1997PublishedNov 7, 2001Patent grantedAug 18, 2004Term endedJan 29, 2017

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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