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Expired European patentEurope

Layered compounds of mixed oxides and Lewis bases

EP 0051997 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 November 6, 1981 and granted June 6, 1984. A European patent lasts at most 20 years from filing, so its term ended November 6, 2001.
  • 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 May 6, 2007.
  • 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.
FiledNovember 6, 1981
PublishedMay 19, 1982
GrantedJune 6, 1984
Term endedNovember 6, 2001
Application numberEP 81305296
Classification (CPC)C07F9/02 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedNov 6, 1981PublishedMay 19, 1982Patent grantedJune 6, 1984Term endedNov 6, 2001

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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