Patent US4125660A successfully refreshed from Google Patents.
US4125660A
Expired / Lapsed
US
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Zero pressure device such as tires or run-flat rings
Assignee: Goodyear Tire and Rubber Co
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Filing: 1976-12-17
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Granted: 1978-11-14
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Expires: 1996-12-17
Abstract
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.
Inventors
- 👤 John R. White
- 👤 Frank J. Murray
- 👤 Cletus A. Becht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; B; B60; B60C; B60C1/00; B60C17/00; B60C17/04; B60C17/06; B60C7/00; B60C7/10; B60C7/101; B60C7/1015; C08G18/08; C08G18/10; C08G18/28; C08G18/65; C08G18/66; C08G2110/00; C08G2110/0041; C08G2110/0066; C08G2380/00; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10T; Y10T152/00; Y10T152/10; Y10T152/10036; Y10T152/10054; Y10T152/10279; Y10T152/10378; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
174 words
A zero pressure device composed of a microcellular polyurethane foam having an average density of 60 to 65 pounds per cubic foot for a run-flat device and 30 to 42 pounds per cubic foot for a tire and a center portion having a density less than the density of the outer skin of said device, said microcellular polyurethane being a reaction product of 8.4 to 22.7 mols of an organic polyisocyanate with at least three polyols, each of said three polyols being characterized as follows: 5.2 to 17.8 mols of a polyol of 2 to 3 hydroxyls having a molecular weight of less than 250, 1.2 to 3.2 mols of a polyester polyol of 2 to 3 hydroxyls having a molecular weight of 800 to 3000 and a mol of a polyether polyol of 2 to 3 hydroxyls having a molecular weight of 4000 to 7000, said organic polyisocyanate being selected from the class consisting of solid and liquid methylene-di(phenylene isocyanate) containing sufficient carbodiimide groups to give an isocyanate functionality of 2.1 to 2.3.
Claim 2
Dependent Claim
174 words
A zero pressure device composed of a microcellular polyurethane foam having an average density of 60 to 65 pounds per cubic foot for a run-flat device and 30 to 42 pounds per cubic foot for a tire and a center portion having a density less than the density of the outer skin of said device, said microcellular polyurethane being a reaction product of 8.4 to 22.7 mols of an organic polyisocyanate with at least three polyols, each of said three polyols being characterized as follows: 5.2 to 17.8 mols of a polyol of 2 to 3 hydroxyls having a molecular weight of less than 250, 1.2 to 3.2 mols of a polyester polyol of 2 to 3 hydroxyls having a molecular weight of 800 to 3000 and a mol of a polyether polyol of 2 to 3 hydroxyls having a molecular weight of 4000 to 7000, said organic polyisocyanate being selected from the class consisting of solid and liquid methylene-di(phenylene isocyanate) containing sufficient carbodiimide groups to give an isocyanate functionality of 2.1 to 2.3.
Claim 3
Dependent Claim
25 words
The zero pressure device of claim 1 wherein the device is a microcellular tire having a skin with more density than the center portion thereof.
Claim 4
Dependent Claim
47 words
The device of claim 1 wherein about 8.4 to 22.7 mols of an organic polyisocyanate is reacted with 1.2 to 3.2 mols of a polyester polyol, one mol of a polyether polyol and 5.2 to 17.8 mols of the polyol having a molecular weight less than 250.
Claim 5
Dependent Claim
15 words
The device of claim 3 wherein the organic polyisocyanate is a solid or liquid MDI.
Claim 6
Dependent Claim
29 words
The device of claim 4 wherein the organic polyisocyanate is reacted with the polyester polyol to form a quasi-prepolymer and then the quasi-prepolymer is reacted with the other polyols.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |