Shingle having ribs and a cavity on its underside
US6021611A · kind A · utility
87Cited by
47References
39Claims
0Family size
Inventors
Key dates
| Filing date | Jul 2, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Jul 2, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04D1/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roofing shingle includes organic, resinous material and an inorganic filler material, the single having a top surface, two side surfaces, an upper end, and a lower or butt end, defining a cavity on the underside of the shingle, with ribs positioned within the cavity. When applied to a roof, the shingle has the appearance of wooden shake shingle and provides a Class A fire barrier when tested according to ASTM test E108-93 for flame spread, burning brand and intermittent flame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.