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Expired European patentEurope

Oxygen enriched claus system with sulfuric acid injection

EP 0195447 B1 · Applicant: AIR PRODUCTS AND CHEMICALS, INC.

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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 March 20, 1986 and granted October 18, 1989. A European patent lasts at most 20 years from filing, so its term ended March 20, 2006.
  • 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 September 20, 2011.
  • 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.
FiledMarch 20, 1986
PublishedSeptember 24, 1986
GrantedOctober 18, 1989
Term endedMarch 20, 2006
Application numberEP 86103797
Classification (CPC)C01B17/0413

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedMarch 20, 1986PublishedSep 24, 1986Patent grantedOct 18, 1989Term endedMarch 20, 2006

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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