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Expired European patentEurope

Process for producing methacrylic acid

EP 0471853 B1 · Applicant: NIPPON SHOKUBAI CO., LTD.

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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 March 11, 1991 and granted July 24, 1996. A European patent lasts at most 20 years from filing, so its term ended March 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 September 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.
FiledMarch 11, 1991
PublishedFebruary 26, 1992
GrantedJuly 24, 1996
Term endedMarch 11, 2011
Application numberEP 91905438
Classification (CPC)B01J23/002 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 11, 1991PublishedFeb 26, 1992Patent grantedJuly 24, 1996Term endedMarch 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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