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:
Nov. 25, 1986
Filed:
Sep. 30, 1985
Zoltan M Modly, Shaker Heights, OH (US);
Harshaw/Filtrol Partnership, Cleveland, OH (US);
Abstract
This invention relates to a gray vinyl polymer material having improved tolerance to sunlight and other sources of infra red radiation. The vinyl polymer contains an inorganic pigment composed of chromium oxide (Cr.sub.2 O.sub.3) and iron oxide (Fe.sub.2 O.sub.3) wherein the weight ratio of the oxides is about 3:1. The pigment may be blended with titanium dioxide (TiO.sub.2) to give a continuous spectrum of shades ranging from dark gray to light gray. The pigment is prepared by co-calcining the oxides of chromium and iron in finely divided form (-325 mesh) at a relatively low (900.degree.-950.degree. C.) temperature followed by grinding of the co-calcined product to 99% -325 mesh.