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Expired European patentEurope

Process for preparing dinitrobenzophenones

EP 0098677 B1 · Applicant: CHEVRON RESEARCH COMPANY

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 21, 1983 and granted June 14, 1989. A European patent lasts at most 20 years from filing, so its term ended March 21, 2003.
  • 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 21, 2008.
  • 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 21, 1983
PublishedJanuary 18, 1984
GrantedJune 14, 1989
Term endedMarch 21, 2003
Application numberEP 83301556
Classification (CPC)C07C201/08 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMarch 21, 1983PublishedJan 18, 1984Patent grantedJune 14, 1989Term endedMarch 21, 2003

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.