US3924464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmospheric pressure rate of change indicator
Assignee: Mission Systems Orchard Park Inc
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Filing: 1974-02-28
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Granted: 1975-12-09
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Expires: 1994-02-28
Abstract
Abstract An atmospheric pressure rate of change indicator includes a compartment for containing a volume of air, a restricted orifice for effecting communication between the compartment and the atmosphere, a flexible diaphragm operatively associated with the compartment for sensing compartment pressure on one side of the diaphragm and atmospheric pressure on the other side thereof, and an indicator coupled to the flexible diaphragm to display the rate of change of atmospheric pressure as a function of diaphragm deflection. The restricted orifice permits pressure within the compartment to equalize with atmospheric pressure over a period of time so that the rate of change in atmospheric pressure can be sensed and indicated. Pressure within the compartment is unaffected by changes in ambient temperature. A seondary dampening orifice may be provided to shield the diaphragm from rapid fluctuations in atmospheric pressure.
Inventors
- 👤 Richard D Cummins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:35
CPC Classifications
G; G01; G01L; G01L13/00; G01L13/02; G01L13/025; G01W; G01W1/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
An atmospheric pressure rate of change indicator, comprising: a sealed housing having a chamber therewithin and provided with an opening therethrough communicating said housing chamber with the atmosphere; dampening orifice means operatively arranged in said housing opening and adapted to permit pressure of air within said housing chamber to equalize with atmospheric pressure after a period of time; compartment means arranged within said housing chamber, said compartment means providing an air chamber therewithin and including movable wall means exposed on one side to the pressure of air in said compartment chamber and exposed on its other side to the pressure of air in said housing chamber; first restricted orifice means establishing communication between said compartment and houSing chambers for permitting the pressure of air in said compartment chamber to equalize with the pressure of air in said housing chamber after a period of time; and indicator means operatively associated with said movable wall means and responsive to movement thereof for indicating the rate of change of atmospheric pressure, whereby said dampening orifice means may shield said movable wall means from rapid fluctuations in atmospheric pressure.
Claim 2
Dependent Claim
185 words
An atmospheric pressure rate of change indicator, comprising: a sealed housing having a chamber therewithin and provided with an opening therethrough communicating said housing chamber with the atmosphere; dampening orifice means operatively arranged in said housing opening and adapted to permit pressure of air within said housing chamber to equalize with atmospheric pressure after a period of time; compartment means arranged within said housing chamber, said compartment means providing an air chamber therewithin and including movable wall means exposed on one side to the pressure of air in said compartment chamber and exposed on its other side to the pressure of air in said housing chamber; first restricted orifice means establishing communication between said compartment and houSing chambers for permitting the pressure of air in said compartment chamber to equalize with the pressure of air in said housing chamber after a period of time; and indicator means operatively associated with said movable wall means and responsive to movement thereof for indicating the rate of change of atmospheric pressure, whereby said dampening orifice means may shield said movable wall means from rapid fluctuations in atmospheric pressure.
Claim 3
Dependent Claim
68 words
An atomspheric pressure rate of change indicator as set forth in claim 1 wherein said compartment means comprises a relatively large first compartment, a relatively small second compartment, and conduit means establishing communication between said first and second compartments; and wherein said first restricted orifice means is arranged in said second compartment and said movable wall means comprises a flexible diaphragm forming a wall of said second compartment.
Claim 4
Dependent Claim
56 words
An atmospheric pressure rate of change indicator as set forth in claim 2 wherein the enclosing wall of said first compartment is fabricated from a material suitable to vary the volume within said first compartment directly with changes in temperature, whereby the volume within said compartment means may remain substantially unaffected by changes in ambient temperature.
Claim 5
Dependent Claim
60 words
An atmospheric pressure rate of change indicator as set forth in claim 2 and further comprising a supporting base, a shaft, bearing means rotatably mounting said shaft on said base in spaced relation to said flexible diaphragm, and push-pull connection means coupling said flexible diaphragm to said shaft; and wherein said indicator means comprises a pointer secured to said shaft.
Claim 6
Dependent Claim
67 words
An atmospheric pressure rate of change indicator as set forth in claim 14 and further comprising a second restricted orifice means operatively arranged in said conduit means for permitting the pressures in said first and second compartments to equalize after a period of time, whereby said second restricted orifice means may dampen the effect of rapid fluctuations of pressure within said housing chamber on said first compartment.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |