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:
Aug. 27, 2024
Filed:
Sep. 07, 2021
3m Innovative Properties Company, St. Paul, MN (US);
Taisiya Skorina, Woodbury, MN (US);
Kristin M. Amsden, St. Paul, MN (US);
Kenton D. Budd, Woodbury, MN (US);
Rebecca L. A. Everman, Falcon Heights, MN (US);
Jean A. Tangeman, Minneapolis, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A plurality of non-white roofing granules is provided. The roofing granules include a plurality of particles including mineral fines and a calcia-based cement binder; and a non-white pigment-containing coating disposed on at least a portion of exterior surfaces of the particles. Methods of making the roofing granules are also provided. One method includes: mixing material including mineral fines and a calcia-based cement binder to provide agglomerates; curing the agglomerates to provide particles; and coating at least a portion of exterior surfaces of the particles with a non-white pigment-containing coating. Another method of making the roofing granules includes: providing an aqueous dispersion in a tool having cavities, the aqueous dispersion including mineral fines and a calcia-based cement binder; curing the aqueous dispersion in the tool to provide particles; and coating at least a portion of exterior surfaces of the particles with a non-white pigment-containing coating. The roofing granules exhibit an intrinsic total solar reflectance greater than 0.3. Often, the roofing granules contain by-product mineral fines.