Patent US3895528A successfully refreshed from Google Patents.
US3895528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft instrumentation displays
Assignee: UK Secretary of State for Defence
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Filing: 1973-09-21
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Granted: 1975-07-22
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Expires: 1993-09-21
Abstract
Abstract An aircraft instrumentation display comprises instruments one of which combines Pitot and Static pressures in a form which indicates aircraft total energy and can be used as an engine power director and one of which indicates pitot pressure and can be used as an elevator director. The two can be combined in the form in an XY plot on a Cathode Ray Tube. Static Pressure is preferably obtained indirectly from a Base Pressure Tapping. The signals used for driving the instruments can also be used as inputs to an aircraft autopilot.
Inventors
- 👤 John Royal Sturgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:25
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/62; G01C; G01C23/00; G01C5/00; G01C5/06; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
An aircraft instrumentation display system having a source of pitot pressure and a source of static pressure comprising; means for combining the pitot and static pressures to provide a signal, representative of aircraft total energy, for use as an engine power director; a first instrument displaying said total energy signal; means for converting pitot pressure into a signal for use as an elevator director; and a second instrument displaying said pitot pressure signal, both of said instruments being mounted upon a common panel visible to the pilot of the aircraft.
Claim 2
Dependent Claim
90 words
An aircraft instrumentation display system having a source of pitot pressure and a source of static pressure comprising; means for combining the pitot and static pressures to provide a signal, representative of aircraft total energy, for use as an engine power director; a first instrument displaying said total energy signal; means for converting pitot pressure into a signal for use as an elevator director; and a second instrument displaying said pitot pressure signal, both of said instruments being mounted upon a common panel visible to the pilot of the aircraft.
Claim 3
Dependent Claim
58 words
An aircraft instrumentation display system as claimed in claim 1 including means for deriving the signal representative of aircraft total energy from a combination of the pitot and static pressures according to the formula P - nS where P is the pitot pressure, S is the static pressure and n is a constant whose value is substantially 2.
Claim 4
Dependent Claim
23 words
An aircraft instrumentation display system as claimed in claim 2 including a base pressure tapping from which the static pressure is obtained indirectly.
Claim 5
Dependent Claim
145 words
An aircraft instrumentation display system having a source of pitot pressure and a source of static pressure comprising; means for combining the pitot and static pressures to provide a signal, representative of aircraft total energy, for use as an engine power director; means for converting pitot pressure into a signal for use as an elevator director; means for deriving the signal representative of aircraft total energy from a combination of the pitot and static pressures according to the formula P - nS where p is the pitot pressure, S is the static pressure and n is a constant whose value is substantially 2, a Cathode Ray Tube visible to the pilot, and means for displaying on said Cathode Ray Tube said total energy signal and said pitot pressure signal, the display being in the form of an XY plot of P - nS against P.
Claim 6
Dependent Claim
145 words
An aircraft instrumentation display system having a source of pitot pressure and a source of static pressure comprising; means for combining the pitot and static pressures to provide a signal, representative of aircraft total energy, for use as an engine power director; means for converting pitot pressure into a signal for use as an elevator director; means for deriving the signal representative of aircraft total energy from a combination of the pitot and static pressures according to the formula P - nS where p is the pitot pressure, S is the static pressure and n is a constant whose value is substantially 2, a Cathode Ray Tube visible to the pilot, and means for displaying on said Cathode Ray Tube said total energy signal and said pitot pressure signal, the display being in the form of an XY plot of P - nS against P.
Claim 7
Dependent Claim
23 words
An aircraft instrumentation display system as claimed in claim 4 including a base pressure tapping from which the static pressure is obtained indirectly.
References Cited (Backward Citations)
US3667293A
Cited
US3789661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |