Patent US2107997A successfully refreshed from Google Patents.
Patent US3648232A successfully refreshed from Google Patents.
US3648232A
Expired / Lapsed
US
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Flight path display instrument
Assignee: Singer General Precision Inc
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Filing: 1970-06-09
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Granted: 1972-03-07
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Expires: 1990-06-09
Abstract
Abstract An electro-optical flight instrument is provided which accepts input signals from appropriate sensors and transducers on an aircraft to provide a visual display of the pitch angle of the aircraft, the visual display being established by means of a transparent screen positioned in the pilot''s normal line of sight and focused at infinity. A servo reticle is driven in the instrument and is projected at infinity upon the transparent screen, the servo reticle displaying in degrees, the angle between the aircraft and the horizon.
Inventors
- 👤 Alvin S White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:24
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0149; G02B2027/0154; G02B2207/00; G02B2207/123
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
An aircraft display instrument for displaying aircraft pitch angle to the pilot, said instrument comprising: a movable reticle comprising a scale calibrated in degrees of pitch angle; servo means responsive solely to output signals from a pitch angle attack sensor for moving said reticle; and optical means for projecting at infinity an image of said reticle upon a transparent surface in the pilot''s line of sight, whereby the reticle images are projected upon the apparent terrain position of touchdown of the aircraft.
Claim 2
Dependent Claim
82 words
An aircraft display instrument for displaying aircraft pitch angle to the pilot, said instrument comprising: a movable reticle comprising a scale calibrated in degrees of pitch angle; servo means responsive solely to output signals from a pitch angle attack sensor for moving said reticle; and optical means for projecting at infinity an image of said reticle upon a transparent surface in the pilot''s line of sight, whereby the reticle images are projected upon the apparent terrain position of touchdown of the aircraft.
Claim 3
Dependent Claim
16 words
The instrument claimed in claim 1, wherein said reticle comprises an opaque tape having transparent numerals.
References Cited (Backward Citations)
US3230819A
Cited
US3569926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |