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Expired European patentEurope

Process for dimerizing or codimerizing an alpha-olefin

EP 0498857 B1 · Applicant: EXXON CHEMICAL PATENTS INC.

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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 October 30, 1990 and granted May 29, 1996. A European patent lasts at most 20 years from filing, so its term ended October 30, 2010.
  • 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 April 30, 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.
FiledOctober 30, 1990
PublishedAugust 19, 1992
GrantedMay 29, 1996
Term endedOctober 30, 2010
Application numberEP 91900622
Classification (CPC)B01J31/1805 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedOct 30, 1990PublishedAug 19, 1992Patent grantedMay 29, 1996Term endedOct 30, 2010

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.