Patent US3136120A successfully refreshed from Google Patents.
US3136120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable burning rate charge
Assignee: RTX Corp
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Filing: 1961-02-27
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Granted: 1964-06-09
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Expires: 1981-02-27
Abstract
No abstract record available.
Inventors
- 👤 James L Grosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:56
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
IN A SOLID PROPELLANT ROCKET ENGINE HAVING A SOLID PROPELLANT GRAIN THEREIN AS ITS SOLE ENERGY SOURCE, AT LEAST ONE PASSAGE THROUGH SAID GRAIN INTERSECTING A NORMAL BURNING SURFACE OF THE PROPELLANT GRAIN, AND MEANS FOR INTRODUCING A COMBUSTION RESTRAINING LIQUID INTO SAID PASSAGE WHEREBY THE RATE OF EVOLUTION OF GAS FROM THE ROCKET ENGINE CAN BE VARIED BY CHANGING THE AMOUNT OF LIQUID INJECTED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |