Wall panels
US4522002A · kind A · utility
37Cited by
6References
5Claims
0Family size
Inventors
Key dates
| Filing date | Jun 15, 1983 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Jun 15, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F13/185
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed is a constant contact panel interlock even during thermal expansion and contraction by providing flexible pins to bear on a tongue in a tongue and groove interlock and also by providing ramps for a bendable flange to slide over and bear on. Further, a material made of polypropylene with 20% calcium carbonate filler is used to form the panels, such material being sufficiently flexible at the temperatures common for panels exposed to direct sunlight (as on a roof or wall) to permit the pins or flange to bend without breaking and also being a material of much lower coefficient of expansion than pure polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.