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:
Feb. 15, 1994
Filed:
Aug. 28, 1990
Applicant:
Inventor:
Joseph Graham, Plymouth, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428144 ; 427186 ; 427187 ; 427214 ; 427215 ; 427221 ; 427384 ; 4273855 ; 427387 ; 428403 ; 428407 ; 428492 ;
Abstract
Roofing granules having surfaces treated with an oil and an elastomeric rubber. The elastomeric rubber can be an organic block copolymer having elastomeric and nonelastomeric repeating units. The oil and rubber are applied to the roofing granules' surfaces as a thin film. The thin film of oil and rubber impedes granule staining from oils in asphalt roofing materials, and reduces dust formation during granule handling. Also disclosed is a roofing shingle and a process for making the roofing granule composition.