US3985446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote controlled, CRT digital display, LLLTV camera-sextant
Assignee: United States Department of the Navy
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Filing: 1974-08-27
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Granted: 1976-10-12
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Expires: 1994-08-27
Abstract
Abstract A device to provide a ship's navigator with information day and night, as to the altitude of celestial bodies on a CRT display with digital display of the altitude and time on the CRT and/or LED read-out.
Inventors
- 👤 Sidney Feldman
- 👤 George G. Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:15
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/002; G01B11/02; G01B11/022; G01C; G01C1/00; G01C1/08; G01D; G01D5/00; G01D5/26; G01D5/39
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
A remote controlled sextant comprising: remotely adjustable sextant optics for reflecting an image of a celestial body; optical incremental disc encoder means mechanically linked to said sextant optics for producing pulses indicative of angular movement of said sextant optics; counter means for accumulating said pulses to indicate said angular position of said sextant optics and thereby the elevation of said celestial body for digital display on a display device; additional optics for combining said image of said celestial body with a horizon image; electronic pickup means for detecting said combined image of said horizon and said celestial body and converting it into an electronic signal for display on said display device; wherein the elevation of said celestial body is displayed on said digital display device when said remotely adjustable sextant optics are adjusted so that said celestial body is aligned with said horizon on said display device.
Claim 2
Dependent Claim
147 words
A remote controlled sextant comprising: remotely adjustable sextant optics for reflecting an image of a celestial body; optical incremental disc encoder means mechanically linked to said sextant optics for producing pulses indicative of angular movement of said sextant optics; counter means for accumulating said pulses to indicate said angular position of said sextant optics and thereby the elevation of said celestial body for digital display on a display device; additional optics for combining said image of said celestial body with a horizon image; electronic pickup means for detecting said combined image of said horizon and said celestial body and converting it into an electronic signal for display on said display device; wherein the elevation of said celestial body is displayed on said digital display device when said remotely adjustable sextant optics are adjusted so that said celestial body is aligned with said horizon on said display device.
Claim 3
Dependent Claim
13 words
The sextant of claim 1 wherein said counter means comprises an up-down counter.
Claim 4
Dependent Claim
12 words
The sextant of claim 1 wherein said additional optics comprises Schmidt optics.
Claim 5
Dependent Claim
18 words
The sextant of claim 1 wherein said electronic pickup means comprises a low level light television pickup tube.
Claim 6
Dependent Claim
58 words
The sextant of claim 1 wherein said sextant optics comprises: a fixed horizon mirror; a variable speed motor; a tangent screw connected to said variable speed motor; a sector gear connected to said tangent screw so that the angular rotation of said sector gear is adjusted by said tangent screw, index mirror means connected to said sector gear.
Claim 7
Dependent Claim
13 words
The sextant of claim 5 wherein said counter means comprises an up-down counter.
Claim 8
Dependent Claim
12 words
The sextant of claim 5 wherein said additional optics comprises Schmidt optics.
Claim 9
Dependent Claim
18 words
The sextant of claim 5 wherein said electronic pickup means comprises a low level light television pickup tube.
Claim 10
Dependent Claim
79 words
A sextant comprising: adjustable sextant optics for reflecting a first image; additional optics for combining said first image with a horizon image; camera tube means for detecting the combined image of said first and horizon images and generating an output signal representative of the combined image; an electronic display device electrically receptive to and capable of displaying a manifestation of said representative signal; whereby said manifestation may be displayed at a location different from that occupied by said sextant.
Claim 11
Dependent Claim
79 words
A sextant comprising: adjustable sextant optics for reflecting a first image; additional optics for combining said first image with a horizon image; camera tube means for detecting the combined image of said first and horizon images and generating an output signal representative of the combined image; an electronic display device electrically receptive to and capable of displaying a manifestation of said representative signal; whereby said manifestation may be displayed at a location different from that occupied by said sextant.
Claim 12
Dependent Claim
113 words
The sextant of claim 9 comprising: adjusting means susceptible to remote control and connected to said sextant optics for varying the angular orientation of said sextant optics; gauging means integral with and responsive to said adjusting means for generating electrical pulses indicative of a change in the angular orientation of said sextant optics; a counter connected to the output of said gauging means for receiving and accumulating said electrical pulses and providing an electrical signal to said display device indicative of the angular orientation of said sextant optics; whereby a representation of the angular orientation of said sextant optics may be displayed at a location visually remote from that occupied by said sextant.
Claim 13
Dependent Claim
63 words
The sextant of claim 10 comprising a stabilizing platform attached to a moveable vehicle subjected to roll, pitch and yaw, for supporting said sextant optics and for flexibly retaining said additional optics in fixed relation with said camera tube whereby the orientation of said sextant optics with respect to said additional optics is independent of the roll, pitch and yaw of said vehicle.
References Cited (Backward Citations)
US3780221A
Cited
US3752591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |