US3569994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Navigational computer
Assignee: Individual
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Filing: 1968-12-26
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Granted: 1971-03-09
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Expires: 1988-12-26
Abstract
Abstract A navigational computer including a base member having arranged thereon an arcuately disposed logarithmic scale, a density altitude scale, a pressure altitude scale and an air temperature scale. A disc member of a smaller diameter than the logarithmic scale on the base member is concentrically rotatably mounted on the base member. The disc member having arranged thereon a logarithmic scale, time scales and windows disposed at predetermined positions for exposing the density altitude scale, pressure altitude scale and the air temperature scale on the base member.
Inventors
- 👤 Ben W Rau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
G; G06; G06G; G06G1/00; G06G1/0005; G06G1/0052; G01; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
333 words
A flight data computer for solving navigational problems comprising a body member having a circular disc member fixedly and rotatably secured atop it, a first arcuately disposed logarithmic scale having an index on said body member, a second arcuately disposed logarithmic scale having an index on said disc member in cooperative alignment therewith, arcuately arranged pressure altitude, density altitude and air temperature scales on said body member, said disc member having a first window having an air temperature scale associated with it, a second window having a pressure altitude scale associated with it, and a third window having an indicator marker associated with it, said first window having said air temperature scale associated with it and said second window having said indicator marker associated with it being in cooperative alignment with said pressure altitude and said density altitude scales on said body member, respectively, such that the density altitude is indicated on said density altitude scale by said indicator marker when the pressure altitude is aligned with the outside air temperature on said air temperature scale, said first and second logarithmic scales, said air temperature scale on said body member and said second window having said pressure altitude scale associated with it being arranged to indicate the corrected altitude upon aligning said first logarithmic scale aligned with the indicia corresponding to the indicated altitude of said second logarithmic scale when the indicia corresponding to the pressure altitude on said pressure altitude scale on said body member is aligned with the indicia corresponding to the outside air temperature on said air temperature scale associated with said second window, said air temperature scales on said body member and associated with said first window each having a zero index and each increasing in a positive value and in a negative value in the same direction on opposite sides of said zero index, whereby positive and negative air temperature values are read and indicated in the same direction from the index on both said air temperature scales.
Claim 2
Dependent Claim
333 words
A flight data computer for solving navigational problems comprising a body member having a circular disc member fixedly and rotatably secured atop it, a first arcuately disposed logarithmic scale having an index on said body member, a second arcuately disposed logarithmic scale having an index on said disc member in cooperative alignment therewith, arcuately arranged pressure altitude, density altitude and air temperature scales on said body member, said disc member having a first window having an air temperature scale associated with it, a second window having a pressure altitude scale associated with it, and a third window having an indicator marker associated with it, said first window having said air temperature scale associated with it and said second window having said indicator marker associated with it being in cooperative alignment with said pressure altitude and said density altitude scales on said body member, respectively, such that the density altitude is indicated on said density altitude scale by said indicator marker when the pressure altitude is aligned with the outside air temperature on said air temperature scale, said first and second logarithmic scales, said air temperature scale on said body member and said second window having said pressure altitude scale associated with it being arranged to indicate the corrected altitude upon aligning said first logarithmic scale aligned with the indicia corresponding to the indicated altitude of said second logarithmic scale when the indicia corresponding to the pressure altitude on said pressure altitude scale on said body member is aligned with the indicia corresponding to the outside air temperature on said air temperature scale associated with said second window, said air temperature scales on said body member and associated with said first window each having a zero index and each increasing in a positive value and in a negative value in the same direction on opposite sides of said zero index, whereby positive and negative air temperature values are read and indicated in the same direction from the index on both said air temperature scales.
Claim 3
Dependent Claim
21 words
The flight data computer of claim 1, wherein said first window and said second window are disposed diametrically opposite one another.
Claim 4
Dependent Claim
163 words
The flight data computer of claim 2, wherein the index of said second logarithmic scale is disposed in a position within a range between an 8:00 0''clock to a 9:00 0''clock position with respect to a line drawn between the diametrically opposed positions of said first and second windows, said index of said first logarithmic scale being correspondingly positioned with respect to a line drawn corresponding to the longitudinal axis of said computer, whereby the indicia on said first and second logarithmic scales increase in value from said indexes in a clockwise direction such that the airspeeds normally encountered are disposed arcuately about the line drawn corresponding to the longitudinal axis of said computer and can be read right side up in a substantially vertical position so that computed airspeed values can be read without rotatably manipulating said computer to position the indicated true airspeed right side up in a substantially vertical position to permit the same to be easily and quickly read.
Claim 5
Dependent Claim
56 words
The flight data computer of claim 3, wherein the indicia on at least said first logarithmic scale comprises numerical indicia which is calibrated and is indicated from 110 to at least 300 in increments of 10 from its index in a clockwise direction, whereby airspeeds can be directly read without converting the indicated true airspeed readings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |