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Expired European patentEurope

Organic compound showing a smectic phase A, mixture containing this compound and process for making it

EP 0157679 B1 · Applicant: THOMSON-CSF

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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 March 12, 1985 and granted May 18, 1988. A European patent lasts at most 20 years from filing, so its term ended March 12, 2005.
  • 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 September 12, 2010.
  • 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.
FiledMarch 12, 1985
PublishedOctober 9, 1985
GrantedMay 18, 1988
Term endedMarch 12, 2005
Application numberEP 85400476
Classification (CPC)C07C65/21 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMarch 12, 1985PublishedOct 9, 1985Patent grantedMay 18, 1988Term endedMarch 12, 2005

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.