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Expired European patentEurope

Maleic acid derivatives of 2,5-dimercapto-1,3,4-thiadiazoles and lubricating compositions containing same

EP 0289964 B1 · Applicant: R.T. VANDERBILT COMPANY, INC.

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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 April 30, 1988 and granted July 28, 1993. A European patent lasts at most 20 years from filing, so its term ended April 30, 2008.
  • 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 October 30, 2013.
  • 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.
FiledApril 30, 1988
PublishedNovember 9, 1988
GrantedJuly 28, 1993
Term endedApril 30, 2008
Application numberEP 88106956
Classification (CPC)C10M173/00 +2 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedApril 30, 1988PublishedNov 9, 1988Patent grantedJuly 28, 1993Term endedApril 30, 2008

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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