Patent US4596512A successfully refreshed from Google Patents.
US4596512A
Expired / Lapsed
US
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Circulation controlled rotor blade tip vent valve
Assignee: RTX Corp
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Filing: 1984-08-23
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Granted: 1986-06-24
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Expires: 2004-08-23
Abstract
Abstract Inadvertent slot opening in a circulation controlled rotor due to plenum valve leakage is averted by venting duct pressure below a control minimum. A vent valve is disclosed.
Inventors
- 👤 Timothy A. Krauss
- 👤 Donald R. Carter, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:03
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A circulation controlled rotor system, comprising: a pressurized air plenum; plenum valves for modulating the release of air from the plenum; a blade having an edge slot for circulation control; a duct disposed in the blade for communicating air from the plenum valves to the edge slot; and valve means disposed in the duct for venting pressure from the duct in response to air pressure in the duct below a minimum control pressure.
Claim 2
Dependent Claim
73 words
A circulation controlled rotor system, comprising: a pressurized air plenum; plenum valves for modulating the release of air from the plenum; a blade having an edge slot for circulation control; a duct disposed in the blade for communicating air from the plenum valves to the edge slot; and valve means disposed in the duct for venting pressure from the duct in response to air pressure in the duct below a minimum control pressure.
Claim 3
Dependent Claim
66 words
A circulation controlled rotor system according to claim 1: wherein the edge slot is preloaded closed at a slot preload pressure which is less than the minimum control pressure; and wherein the valve means vents pressure from the duct in response to air pressure in the duct in a range of pressures extending from at least the slot preload pressure to below the minimum control pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |