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Expired European patentEurope

Method for the removal of H2S and/or ash from molten sulfur

EP 0045636 B1 · Applicant: EXXON RESEARCH AND ENGINEERING 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 July 31, 1981 and granted March 27, 1985. A European patent lasts at most 20 years from filing, so its term ended July 31, 2001.
  • 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, 2007.
  • 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, 1981
PublishedFebruary 10, 1982
GrantedMarch 27, 1985
Term endedJuly 31, 2001
Application numberEP 81303510
Classification (CPC)C01B17/0232

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJuly 31, 1981PublishedFeb 10, 1982Patent grantedMarch 27, 1985Term endedJuly 31, 2001

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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