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. 16, 1992
Filed:
Sep. 28, 1989
Applicant:
Inventors:
Assignee:
K.K. Sankyo Seiki Seisakusho, Nagano, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
359273 ; 359268 ; 359269 ;
Abstract
An electrochromic display device uses a metal-phthalocyanine derivative as an electrochromic material at the display electrode side and a metal-phthalocyanine derivative being preliminarily held in a reduced state or a redox material being stable in an oxidized state at the counter electrode side.