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Expired European patentEurope

Method for the production of acetylene and synthesis gas or reduction gas from carbon in an electric arc process

EP 0133982 B1 · Applicant: HÜLS AKTIENGESELLSCHAFT

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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 July 31, 1984 and granted May 20, 1987. A European patent lasts at most 20 years from filing, so its term ended July 31, 2004.
  • 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 January 31, 2010.
  • 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.
FiledJuly 31, 1984
PublishedMarch 13, 1985
GrantedMay 20, 1987
Term endedJuly 31, 2004
Application numberEP 84109029
Classification (CPC)C07C1/00 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJuly 31, 1984PublishedMarch 13, 1985Patent grantedMay 20, 1987Term endedJuly 31, 2004

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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