Patent US2013138A successfully refreshed from Google Patents.
Patent US3553577A successfully refreshed from Google Patents.
US3553577A
Expired / Lapsed
US
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Active propellant grain regression rate monitor for rocket engines
Assignee: United States Department of the Air Force
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Filing: 1968-01-23
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Granted: 1971-01-05
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Expires: 1988-01-23
Abstract
Abstract A PROPELLANT GRAIN REGRESSION RATE MONITOR FOR ROCKET ENGINES INCLUDING A PLURALITY OF SHUNTED RESISTORS SERIALLY CONNECTED AND LOCATED IN THE ROCKET FUEL AND FURTHER CONNECTED IN A CIRCUIT WITH A POWER SOURCE AND A RECORDER. CONSUMABLE FUZE WIRES SHUNTING THE RESISTORS WHEREBY THE CURRENT IN THE CIRCUIT IS CHANGED EACH TIME THE FLAME FRONT CONSUMES ONE OF THE WIRES.
Inventors
- 👤 Gale F Stromberg
- 👤 John F Easton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:16
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/96
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |