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Expired European patentEurope

Process for producing hydrogen cyanide

EP 0657384 B1 · Applicant: MITSUBISHI GAS CHEMICAL COMPANY, 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 November 4, 1994 and granted February 24, 1999. A European patent lasts at most 20 years from filing, so its term ended November 4, 2014.
  • 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 May 4, 2020.
  • 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.
FiledNovember 4, 1994
PublishedJune 14, 1995
GrantedFebruary 24, 1999
Term endedNovember 4, 2014
Application numberEP 94117415
Classification (CPC)C01C3/0204

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedNov 4, 1994PublishedJune 14, 1995Patent grantedFeb 24, 1999Term endedNov 4, 2014

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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