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Expired European patentEurope

Process for periodically heating the product separator of a plant for the production of phthalic anhydride and maleic anhydride

EP 0158747 B1 · Applicant: METALLGESELLSCHAFT AG

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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 December 24, 1984 and granted January 12, 1994. A European patent lasts at most 20 years from filing, so its term ended December 24, 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 June 24, 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.
FiledDecember 24, 1984
PublishedOctober 23, 1985
GrantedJanuary 12, 1994
Term endedDecember 24, 2004
Application numberEP 84201933
Classification (CPC)C07C51/573

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedDec 24, 1984PublishedOct 23, 1985Patent grantedJan 12, 1994Term endedDec 24, 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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