Composite roofing panel
US4418108A · kind A · utility
34Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1982 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Feb 8, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/674
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A composite panel including a fibrous glass board and foamed-in-place plastic foam has a perforated sheet at the foam-fiberglass interface, there being at least two holes per square inch in the perforated sheet, the diameter of the holes being less than 0.06 of an inch, and the amount of open area represented by the holes being less than 1.5 percent of the total area of the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.