US3714092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur-cured polyurethanes based on a polyester prepared from azelaic acid, dimer acid and lower alkane glycols
Assignee: ATK Launch Systems LLC
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Filing: 1971-07-27
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Granted: 1973-01-30
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Expires: 1991-07-27
Abstract
Abstract Sulfur-curable polyester urethane crude rubbers having improved hydrolysis resistance and excellent properties when exposed to low temperatures over a long period of time are prepared by the reaction of an organic diisocyanate with a polyester prepared from an acid mixture having 90/10 to 97/3 preferably 94/6 mole ratio of azelaic acid to a long chain dibasic acid and a polyol mixture having a 65/35 to 75/25 preferably 70/30 mole ratio of 1, 4-butanediol to propylene glycol followed by chain extension with a polyol having pendant aliphatic unsaturation.
Inventors
- 👤 M Mazzeo
- 👤 A Santaniello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/87; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/423; C08G18/4233; C08G18/4236; C08G18/4238; C08G18/67; C08G18/675
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3043807A
Cited
US3402135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |