Built-up roofing using sulfur asphalt
US4135022A · kind A · utility
21Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1975 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Oct 7, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/53
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure describes built-up roofing having improved resistance to spreading of fire, fabricated from two or more layers of felt impregnated with asphalt based saturant with asphalt based coating spread on top of each felt layer; the saturant asphalt or coating asphalt or both are blends of 90 - 45% asphalt with 10 - 55% sulfur. The roofing is built-up in the conventional manner by "mopping" fluid asphalt based coating onto felt layers impregnated with asphalt based impregnant. A protective layer of inert mineral aggregate (e.g. gravel) optionally covers the top coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.