Expired European patentEurope
N-substituted amino acid derivatives for use in liquid crystal materials and devices
EP 0241502 B1 · Applicant: Secretary of State for Defence in Her Britannic Majesty's Gov. of the United Kingdom of Great Britain and Northern Ireland
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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.
Why it's free to use
- Filed October 6, 1986 and granted May 23, 1990. A European patent lasts at most 20 years from filing, so its term ended October 6, 2006.
- 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 April 6, 2012.
- 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.
FiledOctober 6, 1986
PublishedOctober 21, 1987
GrantedMay 23, 1990
Term endedOctober 6, 2006
Application numberEP 86905900
Classification (CPC)C09K19/42 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.