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:
Aug. 04, 1981
Filed:
Feb. 01, 1979
Applicant:
Inventor:
Fereydoun Gharadjedaghi, Neuchatel, CH;
Assignee:
Ebauches S.A., Neuchatel, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
350349 ; 3503 / ; 2522991 ; 25229968 ;
Abstract
An electro-optic passive display device comprising a pair of plates having, as an active component between the plates, a mixture comprising a nematic liquid crystal possessing negative dielectric anisotropy, dichroic molecules and a chiralic compound capable of providing a helical structure to the active component, the chiralic compound concentration being selected to produce a pitch of the helix between 0.9d and 3d, 'd' being the distance between plates, critical to ensure the formation of a helical structure only under the effect of an electric field and to provide a high contrast display.