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Expired European patentEurope

Liquid crystal compounds, mixtures and devices

EP 0705318 B1 · Applicant: SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOV. OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND

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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 28, 1993 and granted April 16, 1997. A European patent lasts at most 20 years from filing, so its term ended May 28, 2013.
  • 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 28, 2018.
  • 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 28, 1993
PublishedApril 10, 1996
GrantedApril 16, 1997
Term endedMay 28, 2013
Application numberEP 93913240
Classification (CPC)C07C69/96 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedMay 28, 1993PublishedApril 10, 1996Patent grantedApril 16, 1997Term endedMay 28, 2013

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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