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Expired European patentEurope

Inhibiting formation of foulants in acrylonitrile manufacture or recovery

EP 0872475 B1 · Applicant: NALCO/EXXON ENERGY CHEMICALS, L.P.

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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 27, 1998 and granted October 22, 2003. A European patent lasts at most 20 years from filing, so its term ended March 27, 2018.
  • 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 27, 2023.
  • 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 27, 1998
PublishedOctober 21, 1998
GrantedOctober 22, 2003
Term endedMarch 27, 2018
Application numberEP 98302381
Classification (CPC)C07C253/32

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedMarch 27, 1998PublishedOct 21, 1998Patent grantedOct 22, 2003Term endedMarch 27, 2018

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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