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Expired European patentEurope

A method of preparing 2-(difluoromethoxy)-1,1,1,2-tetrafluoroethane

EP 0341004 B1 · Applicant: Anaquest, Inc.

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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 28, 1989 and granted November 25, 1992. A European patent lasts at most 20 years from filing, so its term ended April 28, 2009.
  • 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 28, 2014.
  • 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 28, 1989
PublishedNovember 8, 1989
GrantedNovember 25, 1992
Term endedApril 28, 2009
Application numberEP 89304363
Classification (CPC)C07C41/22 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 28, 1989PublishedNov 8, 1989Patent grantedNov 25, 1992Term endedApril 28, 2009

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.