Patent Yard Sign in
Expired European patentEurope

Tolane derivatives, liquid crystal compositions containing the derivatives and liquid crystal display device using the compositions

EP 0581272 B1 · Applicant: SEIKO EPSON CORPORATION

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed July 28, 1993 and granted May 8, 1996. A European patent lasts at most 20 years from filing, so its term ended July 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 January 28, 2019.
  • 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.
FiledJuly 28, 1993
PublishedFebruary 2, 1994
GrantedMay 8, 1996
Term endedJuly 28, 2013
Application numberEP 93112087
Classification (CPC)C09K19/42 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJuly 28, 1993PublishedFeb 2, 1994Patent grantedMay 8, 1996Term endedJuly 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

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