US3191379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propellant grain for rocket motors
Assignee: Individual
•
Filing: 1961-03-08
•
Granted: 1965-06-29
•
Expires: 1981-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:14
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
142 words
A SOLID PROPELLANT ROCKET MOTOR COMPRISING A CYLINDRICAL CASING HAVING A ROUNDED END CLOSURE AT ONE END AND AN OPENING AT THE OTHER END, A TUBULAR BODY OF SOLID PROPELLANT GRAIN HAVING A CYLINDRICAL BORE AND POSITIONED WITHIN SAID CASING CONCENTRICALLY WITH AND SPACED THEREFROM AND DEFINING AN ANNULAR SPACE, A GRAIN OF SOLID PROPELLANT BONDED TO THE ENTIRE INNER SURFACE OF THE CASING, MEANS CLOSING THE ANNULAR SPACE BETWEEN THE OPEN END OF THE CASING AND SAID TUBULAR BODY, AN OUTWARDLY FLARED NOZZLE ATTACHED TO THE OPEN END OF THE CASING AND EXTENDING INTO THE CYLINDRICAL BORE, WHEREBY AFTER IGNITION THE COMBUSTION PRODUCTS OF SAID GRAIN PASS FORWARD THROUGH THE ANNULAR SPACE TOWARD THE CLOSED END OF THE CASING AND THEN OUT THROUGH THE CYLINDRICAL BORE, COMBINING WITH THE COMBUSTION PRODUCTS OF THE TUBULAR BODY AND CONTINUING OUT THROUGH SAID NOZZLE.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |