Photocatalytic colored roofing granules
US8920926B2 · kind B2 · utility
6Cited by
12References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2008 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Aug 15, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Algae-resistant roofing granules include a mineral core and an exterior coating including clay, colloidal silica, phosphate, a metal oxide, and a photocatalytic particulate having an average size under 100 nm. By varying the proportions of the components to the binder for the exterior coating, improved control of the pot life of the coating composition can be achieved, and the binder can be formulated to accommodate different manufacturing conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.