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. 23, 1992
Filed:
Nov. 08, 1990
Applicant:
Inventor:
Harry D Ward, Lancaster, PA (US);
Assignee:
Armstrong World Industries, Inc., Lancaster, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08K / ;
U.S. Cl.
CPC ...
524114 ; 524247 ; 524249 ;
Abstract
Coating compositions for making films having reduced surface resistivity are described herein. These compositions are clear and produce films that are clear and transparent enough to read newsprint through the films. The compositions include colloidal silica, a choline based antistat, and a film-forming binder which is a (meth)acrylic polymer having a quaternary ammonium salt moiety in the polymeric molecule.