Patent US3574800A successfully refreshed from Google Patents.
US3574800A
Expired / Lapsed
US
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Method of preparing staple-containing propellant grains
Assignee: United States Department of the Army
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Filing: 1965-11-01
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Granted: 1971-04-13
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Expires: 1985-11-01
Abstract
Abstract STAPLE-CONTAINING PROPELLANT GRAINS ARE PREPARED BY EXTRUDING STRANDS OF ALL OF THE PROPELLANT INGREDIENTS EXCEPT THE PLASTICIZER AROUND A CONTINUOUS METAL WIRE. THE EXTRUDED STRANDS ARE CHOPPED INTO SHORT PELLETS AND THE PELLETS ARE DISPOSED IN A MOLD. LIQUID PLASTICIER IS THEN INTRODUCED, AND THE GRAIN IS CURED. THE THIS PROCESS, DEGRADATION OF METAL STAPLES DURING MIXING AND CUTTING OF PELLETS IS AVOIDED, AND THE STAPLES TAKE THE FORM OF WIRES WHICH EXTEND THE FULL LENGTH OF THE PELLETS. THE BURNING CHARACTERISTICS OF THE GRAIN ARE SUBSTANTIALLY IMPROVED BY THE INCREASED STAPLE LENGTH.
Inventors
- 👤 Everette M Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:05
CPC Classifications
C; C06; C06B; C06B45/00; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; C06B21/00; C06B21/0033; C06B21/0075; C06B33/00; C06B33/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |