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Expired European patentEurope

Removal of sulfur and/or sulfur compound from industrial process streams using metal alumina spinel

EP 0033424 B1 · Applicant: EXXON RESEARCH AND ENGINEERING COMPANY

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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 29, 1980 and granted May 11, 1988. A European patent lasts at most 20 years from filing, so its term ended December 29, 2000.
  • 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 29, 2006.
  • 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 29, 1980
PublishedAugust 12, 1981
GrantedMay 11, 1988
Term endedDecember 29, 2000
Application numberEP 80304734
Classification (CPC)B01D53/02

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedDec 29, 1980PublishedAug 12, 1981Patent grantedMay 11, 1988Term endedDec 29, 2000

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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