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:
Sep. 22, 1987
Filed:
Mar. 07, 1984
Applicant:
Inventor:
Charles G Kalt, Williamstown, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340763 ; 340764 ; 34081527 ; 350269 ;
Abstract
An electrostatic display device of the type which includes a fixed electrode (16) of first reflective properties and a movable flapper (30) of different reflective properties has an improved fixed electrode. In particular, the fixed electrode (16) includes structure for defining venting regions or passages (44) which allow air from the atmosphere to communicate with the underside of a mechanical flapper (30) in the display device.