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:
Jan. 24, 1984
Filed:
Oct. 02, 1981
Applicant:
Inventors:
Gilbert C Collins, Southampton, GB;
David J Schiffrin, Southampton, GB;
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
350357 ; 2524081 ; 252600 ;
Abstract
The lifetime of a metal diphthalocyanine electrochromic display can be substantially extended by employing a predominantly non-aqueous low hydroxyl ion electrolyte. A preferred electrolyte solvent is ethylene glycol and preferred conductivity salts are tetraethyl ammonium fluoride and sodium chloride. In the case of sodium chloride, conductivity is improved by the addition of up to 25% water to the electrolyte.