The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2004
Filed:
Dec. 04, 2001
Applicant:
Inventors:
Thierry Chuard, Les Geneveys-sur-Coffrane, CH;
Robert Deschenaux, La Chaux-de-Fonds, CH;
Rolf Klappert, Neuchâtel, CH;
Séverine Meyer, Neuchâtel, CH;
Assignee:
Asulab S.A., Marin, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K 1/958 ;
U.S. Cl.
CPC ...
C09K 1/958 ;
Abstract
The present invention concerns chiral doping agents allowing a modification to be induced in the spiral pitch of a cholesteric liquid crystal, said doping agents including a biactivated chiral unit at least one of whose functions allows a chemical link to be established with an isomerisable group, for example by radiation, said group possibly having a polymerisable or co-polymerisable end chain. These new chiral doping agents find application in particular in a color display.