US4091729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low vulnerability booster charge caseless ammunition
Assignee: United States Department of the Army
•
Filing: 1977-03-07
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Granted: 1978-05-30
•
Expires: 1997-03-07
Abstract
Abstract A low vulnerability booster charge comprising single, fairly large crystalsf 1,3,5,7-tetramethylenetetranitramine (HMX) or 1,3,5,-trimethylenetrinitramine (RDX) about 160 microns diameter coated with a polyurethane cement which comprises about 15 weight percent of the entire booster charge.
Inventors
- 👤 Frank H. Bell
- 👤 Ronald L. Borcherding
- 👤 William O. Munson
- 👤 Michael S. McDonald
- 👤 John A. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:25
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/18; C06B45/20; C06B45/22; Y; Y10; Y10S; Y10S102/00; Y10S102/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
109 words
In a gun ammunition cartridge including a cylindrical, caseless propellant charge, a projectile bonded into one end thereof, and a primer cap bonded into the other end, a cavity being provided in the propellant charge adjacent the primer cap, the improvement comprising: a particulate booster charge in the cavity wherein each particle comprises a single crystal ranging from 100 to 500 micron weight mean diameter selected from the group consisting of 1,3,5,7-tetramethylenetetranitramine and 1,3,5-trimethylenetrinitramine and a cured polyurethane coating on each crystal comprising about 30 to 55 weight % diisocyanate bitolylene, about 40 to 65 weight % hydroxyl-terminated polyethylene oxide, and about 5 to 15 weight % trimethylol propane.
Claim 2
Dependent Claim
109 words
In a gun ammunition cartridge including a cylindrical, caseless propellant charge, a projectile bonded into one end thereof, and a primer cap bonded into the other end, a cavity being provided in the propellant charge adjacent the primer cap, the improvement comprising: a particulate booster charge in the cavity wherein each particle comprises a single crystal ranging from 100 to 500 micron weight mean diameter selected from the group consisting of 1,3,5,7-tetramethylenetetranitramine and 1,3,5-trimethylenetrinitramine and a cured polyurethane coating on each crystal comprising about 30 to 55 weight % diisocyanate bitolylene, about 40 to 65 weight % hydroxyl-terminated polyethylene oxide, and about 5 to 15 weight % trimethylol propane.
Claim 3
Dependent Claim
14 words
The cartridge of claim 1 wherein the crystals of the booster charge are 1,3,5,7-tetramethylenetetranitramine.
Claim 4
Dependent Claim
14 words
The cartridge of claim 1 wherein the crystals of the booster charge are 1,3,5-trimethylenetrinitramine.
Claim 5
Dependent Claim
19 words
The cartridge of claim 1 wherein the polyurethane coating comprises about 15% by weight of the particulate booster charge.
Claim 6
Dependent Claim
19 words
The cartridge of claim 1 wherein the crystals of the booster charge are any proportions of 1,3,5,7-tetramethylenetetranitramine and 1,3,5-trimethylenetrinitramine.
Claim 7
Dependent Claim
27 words
The cartridge of claim 1 wherein said polyurethane coating comprises 37.58 weight % diisocyanate bitrolylene, 52.52 weight % hydroxyl-terminated polyethylene oxide and 9.80 weight % trimethylol propane.
Claim 8
Dependent Claim
69 words
A particulate, low-vulnerability, booster propellant for gun ammunition wherein each particle comprises: a single crystal ranging from 100 to 500 micron weight mean diameter selected from the group consisting of 1,3,5,7-tetranethylenetetranitramine and 1,3,5-trimethylenetrinitramine; and a cured polyurethane coat on each said crystal comprising about 30 to 55 weight % diisocyanate bitolylene, about 40 to 65 weight % hydroxylterminated polyethylene oxide, and about 5 to 15 weight % trimethylol propane.
Claim 9
Dependent Claim
69 words
A particulate, low-vulnerability, booster propellant for gun ammunition wherein each particle comprises: a single crystal ranging from 100 to 500 micron weight mean diameter selected from the group consisting of 1,3,5,7-tetranethylenetetranitramine and 1,3,5-trimethylenetrinitramine; and a cured polyurethane coat on each said crystal comprising about 30 to 55 weight % diisocyanate bitolylene, about 40 to 65 weight % hydroxylterminated polyethylene oxide, and about 5 to 15 weight % trimethylol propane.
Claim 10
Dependent Claim
11 words
The booster of claim 7 wherein the crystals thereof are 1,3,5,7-tetranethylenetetranitramine.
Claim 11
Dependent Claim
11 words
The booster of claim 7 wherein the crystals thereof are 1,3,5-trimethylenetrinitramine.
Claim 12
Dependent Claim
19 words
The booster of claim 7 wherein said polyurethane coating comprises about 15% by weight of the particulate booster charge.
Claim 13
Dependent Claim
16 words
The booster of claim 7 wherein the crystals thereof are any proportions of 1,3,5,7-tetramethylenetetranitramine and 1,3,5-trimethylenetrinitramine.
Claim 14
Dependent Claim
22 words
The booster propellant as described in claim 7 having thermal stability and ignition values as presented in Table II of the specification.
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |