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Expired European patentEurope

Compounds for ferroelectric liquid crystal devices

EP 0201554 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 November 8, 1985 and granted February 8, 1989. A European patent lasts at most 20 years from filing, so its term ended November 8, 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 May 8, 2011.
  • 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 8, 1985
PublishedNovember 20, 1986
GrantedFebruary 8, 1989
Term endedNovember 8, 2005
Application numberEP 85905639
Classification (CPC)C09K19/42 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedNov 8, 1985PublishedNov 20, 1986Patent grantedFeb 8, 1989Term endedNov 8, 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

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