Patent US4693764A successfully refreshed from Google Patents.
US4693764A
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Control of processibility by particle size in high energy solid propellants
Assignee: Lockheed Martin Corp
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Filing: 1986-09-18
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Granted: 1987-09-15
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Expires: 2006-09-18
Abstract
Abstract A solid propellant which utilizes a high solids loading of blended HMX (84.8%) by combining unground and ground HMX particles to achieve desired processing control.
Inventors
- 👤 Donald D. Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:51
CPC Classifications
C; C06; C06B; C06B25/00; C06B25/34; C06B45/00; C06B45/04; C06B45/06; C06B45/10; Y; Y10; Y10S; Y10S149/00; Y10S149/11; Y10S149/111
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A solid propellant comprised on a weight basis of about 15.15% hydroxyl terminated polybutadiene polymer combined with isophorone diisocyanate; about 0.05% carbon black; and about 84.8% of a mixture of unground HMX having an average means diameter of about 150 microns and ground HMX, having an average mean diameter of about 8-16 microns, wherein the ratio of said ground to unground HMX is from 60:40 to 70:30 by weight and wherein the composite HMX particle size distribution is within the following limits: ______________________________________
Percent greater than
Nom. particle size, μ
______________________________________
7 ± 7 300
18 ± 12 200
47 ± 10 100
57 ± 9 70
65 ± 7 40
68 ± 6 30
71 ± 7 20
77 ± 10 10
88 ± 6 4
95 ± 5 2
______________________________________
Claim 2
Dependent Claim
132 words
A solid propellant comprised on a weight basis of about 15.15% hydroxyl terminated polybutadiene polymer combined with isophorone diisocyanate; about 0.05% carbon black; and about 84.8% of a mixture of unground HMX having an average means diameter of about 150 microns and ground HMX, having an average mean diameter of about 8-16 microns, wherein the ratio of said ground to unground HMX is from 60:40 to 70:30 by weight and wherein the composite HMX particle size distribution is within the following limits: ______________________________________
Percent greater than
Nom. particle size, μ
______________________________________
7 ± 7 300
18 ± 12 200
47 ± 10 100
57 ± 9 70
65 ± 7 40
68 ± 6 30
71 ± 7 20
77 ± 10 10
88 ± 6 4
95 ± 5 2
______________________________________
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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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |