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Expired European patentEurope

Process for removal of hydrogen cyanide from synthesis gas

EP 0958237 B1 · Applicant: ExxonMobil 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 April 23, 1997 and granted June 26, 2002. A European patent lasts at most 20 years from filing, so its term ended April 23, 2017.
  • 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 October 23, 2022.
  • 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.
FiledApril 23, 1997
PublishedNovember 24, 1999
GrantedJune 26, 2002
Term endedApril 23, 2017
Application numberEP 97922432
Classification (CPC)B01D53/14 +2 more

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedApril 23, 1997PublishedNov 24, 1999Patent grantedJune 26, 2002Term endedApril 23, 2017

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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