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Expired European patentEurope

Process for the preparation of a basic salt, such a salt and lubricating oil compositions containing such a salt

EP 0248465 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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 14, 1987 and granted April 10, 1991. A European patent lasts at most 20 years from filing, so its term ended May 14, 2007.
  • 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 14, 2012.
  • 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 14, 1987
PublishedDecember 9, 1987
GrantedApril 10, 1991
Term endedMay 14, 2007
Application numberEP 87200906
Classification (CPC)C07C51/412 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 14, 1987PublishedDec 9, 1987Patent grantedApril 10, 1991Term endedMay 14, 2007

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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