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Expired European patentEurope

Process for preparing overbased oil soluble magnesium salts

EP 0011069 B1 · Applicant: Surpass Chemicals Limited

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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 14, 1978 and granted November 3, 1982. A European patent lasts at most 20 years from filing, so its term ended November 14, 1998.
  • 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 14, 2004.
  • 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 14, 1978
PublishedMay 28, 1980
GrantedNovember 3, 1982
Term endedNovember 14, 1998
Application numberEP 78300625
Classification (CPC)C10M159/24

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedNov 14, 1978PublishedMay 28, 1980Patent grantedNov 3, 1982Term endedNov 14, 1998

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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