US3886009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile containing pyrotechnic composition for reducing base drag thereof
Assignee: United States Department of Health and Human Services
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Filing: 1973-12-13
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Granted: 1975-05-27
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Expires: 1993-12-13
Abstract
Abstract Cartridge employing projectile which carries an improved pyrotechnic composition in a posterior cavity thereof, the pyrotechnic composition emitting gaseous reaction products upon ignition thereof to fill the void or low pressure area rearward the moving projectile to thus reduce drag on the projectile in flight, said pyrotechnic composition comprising by weight about 20-35 percent magnesium, about 47-58 percent strontium nitrate, about 6-12 percent calcium resinate, and about 1-12 percent gelatin.
Inventors
- 👤 Walter J Puchalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:02
CPC Classifications
C; C06; C06B; C06B33/00; C06B33/04; C06B29/00; C06B31/00; C06B31/02; F; F42; F42B; F42B10/00; F42B10/32; F42B10/38; F42B10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
PYROTECHNIC COMPOSITION FOR REDUCING DRAG OF A PROJECTILE, SAID PROJECTILE HAVING A POSTERIOR CAVITY, SAID COMPOSITION DISPOSED IN SAID POSTERIOR CAVITY OF SAID PROJECTILE, SAID COMPOSITION REDUCING DRAG BY EMITTING AGASES INTO VOLID REARWARD SAID PROJECTILE, SAID VOID CAUSED BY FLIGHT OF SAID PROJECTILE, SAID GASES SUBSTANTIALLY FILLING SAID VOID, SAID PYROTECHINIC COMPOSITION COMPRISING BY WEIGHT 25 TO 35 PERCENT MAGNESIUM, 47 TO 58 PERCENT STRONITIUM NITRATE, 6 TO 12 ERCENT CALCIUM RESINATE, 1 TO 12 PERCENT GELATIN.
Claim 2
Dependent Claim
78 words
PYROTECHNIC COMPOSITION FOR REDUCING DRAG OF A PROJECTILE, SAID PROJECTILE HAVING A POSTERIOR CAVITY, SAID COMPOSITION DISPOSED IN SAID POSTERIOR CAVITY OF SAID PROJECTILE, SAID COMPOSITION REDUCING DRAG BY EMITTING AGASES INTO VOLID REARWARD SAID PROJECTILE, SAID VOID CAUSED BY FLIGHT OF SAID PROJECTILE, SAID GASES SUBSTANTIALLY FILLING SAID VOID, SAID PYROTECHINIC COMPOSITION COMPRISING BY WEIGHT 25 TO 35 PERCENT MAGNESIUM, 47 TO 58 PERCENT STRONITIUM NITRATE, 6 TO 12 ERCENT CALCIUM RESINATE, 1 TO 12 PERCENT GELATIN.
Claim 3
Dependent Claim
30 words
Pyrotechnic composition according to claim 1 wherein said gases substantially filling said void effect a total pressure of approximately 12 pounds per square inch in the area rearward said projectile.
Claim 4
Dependent Claim
26 words
Pyrotechnic composition according to claim 1 wherein said composition comprises by weight 29.9 percent magnesium, 51.9 percent strontium nitrate, 8.2 percent calcium resinate, 10 percent gelatin.
Claim 5
Dependent Claim
23 words
Pyrotechnic composition according to claim 1 wherein said composition comprises by weight 33.2 percent magnesium, 57.7 percent strontium nitrate, 9.1 percent calcium resinate.
Claim 6
Dependent Claim
30 words
Pyrotechnic compoSition according to claim 4 wherein said gases substantially filling said void effect a total pressure of approximately 12 pounds per square inch in the area rearward said projectile.
Claim 7
Dependent Claim
73 words
Pyrotechnic composition for reducing drag of a projectile, said projectile having a posterior cavity, said composition disposed in said posterior cavity of said projectile, said composition reducing drag by emitting gases into void rearward said projectile, said void caused by flight of said projectile, said gases substantially filling said void, said pyrotechnic composition comprising by weight 7.3 percent magnesium, 8.2 percent calcium resinate, 10 percent gelatin, 70.9 percent strontium peroxide, 3.6 percent carbon.
Claim 8
Dependent Claim
73 words
Pyrotechnic composition for reducing drag of a projectile, said projectile having a posterior cavity, said composition disposed in said posterior cavity of said projectile, said composition reducing drag by emitting gases into void rearward said projectile, said void caused by flight of said projectile, said gases substantially filling said void, said pyrotechnic composition comprising by weight 7.3 percent magnesium, 8.2 percent calcium resinate, 10 percent gelatin, 70.9 percent strontium peroxide, 3.6 percent carbon.
Claim 9
Dependent Claim
30 words
Pyrotechnic composition according to claim 6 wherein said gases substantially filling said void effect a total pressure of approximately 11 pounds per square inch in the area rearward said projectile.
References Cited (Backward Citations)
US40385A
Cited
US3633512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |