US3145192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylenic polyurethanes useful as propellants
Assignee: ATK Launch Systems LLC
•
Filing: 1957-07-01
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Granted: 1964-08-18
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Donald D Perry
- 👤 Rita M Dudak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:08
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6705; Y; Y10; Y10S; Y10S149/00; Y10S149/12; Y10S149/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE METHOD OF PRODUCING AN ACETYLENIC POLYURETHANE WHICH COMPRISES, MIXING A QUANTITY OF POLY(2-BUTYNE-1,4DIOXYMETHYLENE) WITH FROM ONE TO TWO MOLAR EQUIVALENTS, BASED ON SAID POLY(2-BUTYNE-1,4-DIOXYMETHYLENE), OF 2,4TOLUENE DIISOCYANATE; DISSOLVING THE MIXTURE IN A SOLVENT OF THE CLASS CONSISTING OF BENZENE, ETHYLENE BROMIDE, AND TOLUENE; CAUSING ADDITION REACTION OF SAID POLY(2-BUTYNE1,4-DIOXYMETHYLENE WITH SAID DIISOCYANATE BY BOILING THE SOLUTION WHILE REFLUXING THE SOLVENT; SEPARATING THE SOLVENT FROM THE SOLUTION AFTER A PERIOD OF BOILING EXCEEDING 18 HOURS, AND RECOVERING A SOLID POLYURETHANE.
Claim 2
Independent Claim
80 words
THE METHOD OF PRODUCING AN ACETYLENIC POLYURETHANE WHICH COMPRISES, MIXING A QUANTITY OF POLY(2-BUTYNE-1,4DIOXYMETHYLENE) WITH FROM ONE TO TWO MOLAR EQUIVALENTS, BASED ON SAID POLY(2-BUTYNE-1,4-DIOXYMETHYLENE), OF 2,4TOLUENE DIISOCYANATE; DISSOLVING THE MIXTURE IN A SOLVENT OF THE CLASS CONSISTING OF BENZENE, ETHYLENE BROMIDE, AND TOLUENE; CAUSING ADDITION REACTION OF SAID POLY(2-BUTYNE1,4-DIOXYMETHYLENE WITH SAID DIISOCYANATE BY BOILING THE SOLUTION WHILE REFLUXING THE SOLVENT; SEPARATING THE SOLVENT FROM THE SOLUTION AFTER A PERIOD OF BOILING EXCEEDING 18 HOURS, AND RECOVERING A SOLID POLYURETHANE.
References Cited (Backward Citations)
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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) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |