US4120709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for improving processibility of certain composite propellants by calcining the iron oxide burning rate catalyst
Assignee: ATK Launch Systems LLC
•
Filing: 1973-04-25
•
Granted: 1978-10-17
•
Expires: 1993-04-25
Abstract
Abstract A technique for improving the processibility of composite propellants through reduction of the catalytic effect of iron oxide upon the polymer/curing agent reaction.
Inventors
- 👤 James W. Hamner
- 👤 James O. Hightower
- 👤 Carl M. Rector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:00
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0008; C06B21/0025; C06B23/00; C06B23/007
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A method of lengthening the processing pot life of a hydroxy terminated isocyanate cured polymer propellant containing ammonium perchlorate, aluminum powder and iron oxide which comprises the use of iron oxide which has been calcined at a temperature in the range of from 225° C. to 850° C. inclusive prior to admixture into the propellant.
Claim 2
Independent Claim
55 words
A method of lengthening the processing pot life of a hydroxy terminated isocyanate cured polymer propellant containing ammonium perchlorate, aluminum powder and iron oxide which comprises the use of iron oxide which has been calcined at a temperature in the range of from 225° C. to 850° C. inclusive prior to admixture into the propellant.
Claim 3
Dependent Claim
20 words
The method as recited in claim 1 wherein the iron oxide has been calcined at a temperature of 500° C.
Claim 4
Dependent Claim
25 words
The method as recited in claim 1 wherein the hydroxyl-terminated polymer is selected from the group consisting of hydroxyl-terminated polybutadiene, hydroxyl-terminated polyester, and hydroxyl-terminated polyether.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |