US3715925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature recording altimeter
Assignee: Individual
•
Filing: 1971-10-26
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Granted: 1973-02-13
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Expires: 1991-10-26
Abstract
Abstract A recording altimeter is provided and particularly a miniaturized, compact altimeter adapted for use in flying amusement devices. The altimeter includes a pressure-sensitive system having gauge means, the entire system and gauge means normally being filled with an incompressible fluid such as an alcohol-water mixture. As the pressure outside of the altimeter decreases, part of the incompressible fluid is expelled from the gauge means. After the altimeter returns to original pressure conditions, the partial loss of water from the gauge means reflects a minimum pressure or pressure difference to which the altimeter has been subjected.
Inventors
- 👤 E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/06; G01L7/065
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A recording altimeter comprising a pressure-sensing chamber, pressure-responsive means positioned within said chamber and adapted to expand and contract in response to a decrease or increase, respectively, of pressure therein, hollow gauge means communicating with and extending from said chamber, and an incompressible fluid normally entirely filling said chamber and gauge means, whereby expansion of said pressure-responsive means expels incompressible fluid from said gauge means and subsequent contraction of said pressure-responsive means retracts said incompressible liquid, the resulting emptied portion of said gauge means being commensurate with the intervening change in pressure.
Claim 2
Dependent Claim
92 words
A recording altimeter comprising a pressure-sensing chamber, pressure-responsive means positioned within said chamber and adapted to expand and contract in response to a decrease or increase, respectively, of pressure therein, hollow gauge means communicating with and extending from said chamber, and an incompressible fluid normally entirely filling said chamber and gauge means, whereby expansion of said pressure-responsive means expels incompressible fluid from said gauge means and subsequent contraction of said pressure-responsive means retracts said incompressible liquid, the resulting emptied portion of said gauge means being commensurate with the intervening change in pressure.
Claim 3
Dependent Claim
92 words
A recording altimeter comprising a pressure-sensing chamber, pressure-responsive means positioned within said chamber and adapted to expand and contract in response to a decrease or increase, respectively, of pressure therein, hollow gauge means communicating with and extending from said chamber, and an incompressible fluid normally entirely filling said chamber and gauge means, whereby expansion of said pressure-responsive means expels incompressible fluid from said gauge means and subsequent contraction of said pressure-responsive means retracts said incompressible liquid, the resulting emptied portion of said gauge means being commensurate with the intervening change in pressure.
Claim 4
Dependent Claim
92 words
A recording altimeter comprising a pressure-sensing chamber, pressure-responsive means positioned within said chamber and adapted to expand and contract in response to a decrease or increase, respectively, of pressure therein, hollow gauge means communicating with and extending from said chamber, and an incompressible fluid normally entirely filling said chamber and gauge means, whereby expansion of said pressure-responsive means expels incompressible fluid from said gauge means and subsequent contraction of said pressure-responsive means retracts said incompressible liquid, the resulting emptied portion of said gauge means being commensurate with the intervening change in pressure.
Claim 5
Dependent Claim
28 words
The recording altimeter of claim 1 in which said pressure-sensing chamber has closable vent means to facilitate filling of said chamber and gauge means with said incompressible fluid.
Claim 6
Dependent Claim
14 words
The recording altimeter of claim 1 in which said pressure-responsive means is a bellows.
Claim 7
Dependent Claim
41 words
The recording altimeter of claim 1 in which said pressure-responsive means is a bellows, and including closable vent means extending from said bellows to a point exterior of said pressure-sensing chamber and adapted to establish a reference pressure within said bellows.
Claim 8
Dependent Claim
23 words
The recording altimeter of claim 1 in which said hollow gauge means is a tube, said tube being calibrated in units of pressure.
Claim 9
Dependent Claim
23 words
The recording altimeter of claim 1 in which said hollow gauge means is a tube extending from said pressure-sensing chamber in spiral form.
Claim 10
Dependent Claim
18 words
The recording altimeter of claim 1 in which said incompressible fluid is a mixture of alcohol and water.
Claim 11
Dependent Claim
21 words
The recording altimeter of claim 1 In which said pressure-sensing chamber has a conically-shaped end portion terminating in closable vent means.
Claim 12
Dependent Claim
44 words
The recording altimeter of claim 1 in combination with a calibration jacket, said jacket making a substantially air-tight connection with said pressure-sensing chamber about said gauge means and being adapted for evacuation, and pressure-indicating means connected with said jacket for indicating the pressure therein.
Claim 13
Dependent Claim
71 words
The recording altimeter of claim 1 in which said pressure-responsive means is a bellows, said hollow gauge means is a tube calibrated in desired units of measurement, said pressure-sensing chamber having a conically-shaped end portion terminating in closable tubular vent means, said vent means facilitating filling of said chamber and gauge means with said incompressible liquid and extending from said chamber at least as far as said gauge tube so extends.
Claim 14
Dependent Claim
39 words
The recording altimeter of claim 1 having a miniaturized size weighing from about 0.25 ounce to about 1 ounce, and having a sensitivity to determine differential pressures corresponding to altitudes of up to 5,000 feet above the earth''s surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |