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Expired European patentEurope

Improved zeolite L

EP 0167755 B1 · Applicant: EXXON RESEARCH AND ENGINEERING COMPANY

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Overview

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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 May 13, 1983 and granted March 1, 1989. A European patent lasts at most 20 years from filing, so its term ended May 13, 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 November 13, 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.
FiledMay 13, 1983
PublishedJanuary 15, 1986
GrantedMarch 1, 1989
Term endedMay 13, 2003
Application numberEP 85105928
Classification (CPC)C07C5/226 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMay 13, 1983PublishedJan 15, 1986Patent grantedMarch 1, 1989Term endedMay 13, 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

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