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US3606905A
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Pressure-maintaining and drainage valve of a gas turbine engine
Assignee: MTU Aero Engines AG
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Filing: 1969-09-30
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Granted: 1971-09-21
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Expires: 1989-09-30
Abstract
Abstract A PRESSURE-MAINTAINING AND DRAINAGE VALVE FOR GAS TURBINE ENGINES IN WHICH A DOUBLE-ENDED NIPPLE IS SCREWED INTO EACH END OF THE VALVE BODY CYLINDER ACCOMMODATING A RECIPROCATING SPOOL-TYPE CONTROL PISTON VALVING CONTROL OPENINGS IN THE CYLINDER, THE SPOOL-TYPE CONTROL PISTON ALTERNATELY ABUTS AGAINST SEALS PROVIDED AT THE MUTUALLY FACING END FACES OF THE NIPPLE TO SEAL OFF THE COMMUNICATION THROUGH THAT NIPPLE, AGAINST THE SEALS OF WHICH IT ABUTS.
Inventors
- 👤 Adolf Fehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:57
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22; F02C7/232; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; F16K17/00; F16K17/02; F16K17/04; F05; F05D; F05D2260/00; F05D2260/60; F05D2260/602; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557; Y10T137/7722; Y10T137/7837; Y10T137/7866; Y10T137/7867; Y10T137/7868; Y10T137/7904; Y10T137/7922; Y10T137/7925
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |