Algae-resistant roofing granules
US6214466A · kind A · utility
55Cited by
17References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31815
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Algae-resistant roofing granules coated with: a first coat consisting of a fired silicate-clay matrix containing cuprous oxide and zinc sulfide to provide a slow, long-term bimetallic copper and zinc ions release; and a second coat consisting of a fired silicate-clay matrix containing a pigment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.