Zero pressure device such as tires or run-flat rings
US4125660A · kind A · utility
11Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1976 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Dec 17, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249989
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A zero pressure device is composed of either a microcellular or homogeneous polyurethane made by reacting an organic polyisocyanate with at least three polyols, a monomeric polyol of 2 to 3 hydroxyls having a molecular weight of less than 250, a polyester polyol of 2 to 3 hydroxyls having a molecular weight of 800 to 3000 and a polyether polyol of 2 to 3 hydroxyls having a molecular weight of 4 to 7000. When the zero pressured device is a run-flat ring for a tire-wheel assembly, it has an average density of 60 to 65 pounds per cubic foot and 30 to 42 pounds per cubic foot when it is a tire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.