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. 20, 1981
Filed:
Apr. 02, 1980
Jean-Paul Randin, Neuchatel, CH;
Ebauches S.A., Neuchatel, CH;
Abstract
In preparing an electrolyte comprising a mixture of poly[2-acrylamido-2-methyl-propanesulfphonic acid] and water in which a pigment is distributed substantially homogeneously, monomer of the formula CH.sub.2 .dbd.CH--CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 --SO.sub.3 H is first dissolved in water with a pigment suspended in it. A polymerization initiator, such as 2,2'-azo-bisisobutyronitrile, is added to the mixture and the polymerization reaction is carried out with agitation, at a temperature in the range from room temperature to 60.degree. C. Finally, part of the water is evaporated from the viscous mass obtained, to give the desired mix. The pigmented electrolyte may be used in electro-optical devices such as electrochromic display cells.