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Expired European patentEurope

A process for the production of basic magnesium sulphonates and the products obtained by this process

EP 0013808 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 December 7, 1979 and granted June 15, 1983. A European patent lasts at most 20 years from filing, so its term ended December 7, 1999.
  • 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 June 7, 2005.
  • 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.
FiledDecember 7, 1979
PublishedAugust 6, 1980
GrantedJune 15, 1983
Term endedDecember 7, 1999
Application numberEP 79302824
Classification (CPC)C07G99/0024 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedDec 7, 1979PublishedAug 6, 1980Patent grantedJune 15, 1983Term endedDec 7, 1999

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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