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:
Mar. 24, 1981
Filed:
Mar. 13, 1979
Applicant:
Inventors:
Assignee:
Thomson-CSF, Paris, FR;
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; G02F / ;
U.S. Cl.
CPC ...
252299 ; 252408 ; 2604 / ; 350346 ; 3503 / ; 3503 / ;
Abstract
The invention concerns a substance of diester type, i.e. an organic compound with three benzene nuclei joined by --COO-- groups, exhibiting at least one mesomorphic phase of smectic type. The substance of the invention answers to the formula: ##STR1## where R.sub.1 is an alkyl or alkoxy radical and R.sub.2 an alkyl. In the case where R.sub.1 is an octyl and R.sub.2 a pentyl there is a dielectric isotropy frequency of 30 kHz, i.e. a frequency where the dielectric anistropy changes sign. Application to field-effect display devices with dual-frequency memory.