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:
Jun. 17, 1980
Filed:
Sep. 01, 1977
Charles G Kalt, Williamstown, MA (US);
Thomas F Kalt, Williamstown, MA (US);
Dielectric Systems International, North Adams, MA (US);
Abstract
An electrostatic display device has a closed opaque chamber with one or more transparent windows in a side thereof. Mounted within the chamber adjacent to each window is a resilient electrode that is capable of moving so as to block the adjacent window or to withdraw from the window in response to a signal voltage that is applied between the resilient electrode and a fixed electrode. The total window area is less than about 20% of the exterior surface area of the chamber so that an 'open' window functions optically as a light sink and appears dark. The outer surface of the resilient electrode may be of a bright hue for optical contrast in a normally bright 'day time' ambient. Alternatively a lamp within the chamber provides an electrically actuated display that is visible in a dark ambient.