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:
Oct. 04, 1988
Filed:
Jun. 03, 1986
Jack Silver, London, GB;
National Research Development Corporation, London, GB;
Abstract
An electrochromic device consists of the layers: tin-oxide-coated glass; rare earth diphthalocyanine (REDPC); membrane electrolyte; REDPC; tin-oxide-coated glass. The REDPC is the electrochromic layer and contains a mixture of rare earths as obtained from a natural deposit without being individually separated. The REDPC is preheated to purify it and then sublimed into position as the device is assembled. The device is driven by a controller which is limited to the voltage range +2V to -1V, whereby only the colors red, green and blue are obtainable, that is, although the REDPC at -1.5V would show purple, this is deliberately foregone to prolong its life. The REDPC may be further mixed with tin phthalocyanine chloride or ruthenium, iron, zinc or cobalt phthalocyanine.