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. 27, 1991
Filed:
Jun. 05, 1989
Applicant:
Inventor:
Charles Rydel, Paris, FR;
Assignee:
Jaeger, Levallois Perret, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ; G09G / ; G09G / ;
U.S. Cl.
CPC ...
340712 ; 340711 ; 340765 ; 340784 ; 340794 ;
Abstract
A touch sensor comprises a liquid crystal cell (10) and detector means (40, 50A, 50B) responsive to a change in the dielectric constant of the liquid crystal. The detector means comprise an HF electrical signal generator (40) together with integration means (50A, 50B) suitable for integrating the charge created by any change in the dielectric constant of the liquid crystal (14).