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:
Apr. 06, 1999
Filed:
Sep. 12, 1997
Applicant:
Inventors:
James A Claar, Washington Township, Westmoveland County, PA (US);
Karl F Schimmel, Verona, PA (US);
Shanti Swarup, Hampton Township, Allegheny County, PA (US);
Bruce A Connelly, West Deer Township, Allegheny County, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C09D / ; C09D / ;
U.S. Cl.
CPC ...
525162 ; 525384 ; 525374 ; 525401 ; 525408 ; 525437 ; 526320 ; 528296 ; 528365 ; 528366 ; 528406 ; 528418 ; 528419 ; 528421 ; 528425 ;
Abstract
Coating compositions comprised of a film forming polymer which is the reaction product of (a) a compound containing pendant and/or terminal hydroxyl or epoxy functional groups and (b) citric acid or citric acid anhydride. The coating compositions have enhanced adhesion to galvanized and galvanealed steel substrates without the use of a chrome containing wash primer.