US3529042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing cast solid polyurethane propellants
Assignee: Phillips Petroleum Co
•
Filing: 1959-10-22
•
Granted: 1970-09-15
•
Expires: 1979-10-22
Abstract
No abstract record available.
Inventors
- 👤 Ralph C Lippert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:57
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0008; C06B21/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A METHOD OF PREPARING A CASTABLE PROPELLANT COMPOSITION COMPRISING A SOLID INORGANIC OXIDIZING SALT DISPERSED IN A LIQUID CURABLE POLYURETHANE SUITABLE FOR USE AS THE BINDER COMPONENT IN SAID PROPELLANT COMPOSITIONS, THE IMPROVEMENT COMPRISING HEATING SAID POLYURETHANE WHILE SAID SALT IS BEING DISPERSED THEREIN UNDER VACUUM TO A TEMPERATURE A FEW DEGREES ABOVE THE CURING TEMPERATURE AT WHICH SAID COMPOSITION IS TO BE SUBSEQUENTLY CURED AND FOR SHORT PERIOD OF TIME SUFFICIENT TO DECOMPOSE GAS FORMING IMPURITIES IN SAID POLYURETHANE BYT INSUFFICIENT TO OBTAIN APPRECIABLE CURE OF SAID POLYURETHANE.
Claim 2
Dependent Claim
90 words
IN A METHOD OF PREPARING A CASTABLE PROPELLANT COMPOSITION COMPRISING A SOLID INORGANIC OXIDIZING SALT DISPERSED IN A LIQUID CURABLE POLYURETHANE SUITABLE FOR USE AS THE BINDER COMPONENT IN SAID PROPELLANT COMPOSITIONS, THE IMPROVEMENT COMPRISING HEATING SAID POLYURETHANE WHILE SAID SALT IS BEING DISPERSED THEREIN UNDER VACUUM TO A TEMPERATURE A FEW DEGREES ABOVE THE CURING TEMPERATURE AT WHICH SAID COMPOSITION IS TO BE SUBSEQUENTLY CURED AND FOR SHORT PERIOD OF TIME SUFFICIENT TO DECOMPOSE GAS FORMING IMPURITIES IN SAID POLYURETHANE BYT INSUFFICIENT TO OBTAIN APPRECIABLE CURE OF SAID POLYURETHANE.
References Cited (Backward Citations)
US2855372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |