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:
Jul. 05, 1994
Filed:
Nov. 18, 1992
Applicant:
Inventors:
Barbara J Anderson, Saltsburg, PA (US);
Paul L Benenati, Copley, OH (US);
Harlan B Johnson, Pittsburgh, PA (US);
Thomas A Rechlicz, Lake Charles, LA (US);
William A Williams, Latrobe, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08K / ; C04B / ;
U.S. Cl.
CPC ...
106409 ; 106400 ; 106401 ; 811565 ; 4283179 ;
Abstract
The tendency of microporous material to discolor over a period of time when exposed to the atmosphere during normal usage can be reduced if the microporous material comprises whiteness retaining organic surface active agent.