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Expired European patentEurope

Method for controlling catalytic distillation etherifications

EP 0664778 B1 · Applicant: CHEMICAL RESEARCH & LICENSING COMPANY

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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 14, 1993 and granted February 25, 1998. A European patent lasts at most 20 years from filing, so its term ended October 14, 2013.
  • 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 14, 2019.
  • 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 14, 1993
PublishedAugust 2, 1995
GrantedFebruary 25, 1998
Term endedOctober 14, 2013
Application numberEP 93924318
Classification (CPC)C07C41/06 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedOct 14, 1993PublishedAug 2, 1995Patent grantedFeb 25, 1998Term endedOct 14, 2013

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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