US4138893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic accelerometer
Assignee: United States Department of the Army
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Filing: 1977-12-09
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Granted: 1979-02-13
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Expires: 1997-12-09
Abstract
Abstract A low "g" hydrostatic accelerometer including a differential pressure traucer interposed between a sensing mass, and a pressurized low density fluid.
Inventors
- 👤 Allen B. Holmes
- 👤 Stacy E. Gehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:20
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A hydrostatic accelerometer for the measurement of "g" forces comprising: a housing member including a first interior chamber and a second interior chamber; a differential pressure transducer situated between and separating said first and second interior chambers; a sensing mass in said first interior chamber comprising a solid sensing mass and a liquid sensing mass, said liquid sensing mass abutting said differential pressure transducer; a low density fluid in said second interior chamber; and means for adjusting the pressure in said second chamber.
Claim 2
Dependent Claim
83 words
A hydrostatic accelerometer for the measurement of "g" forces comprising: a housing member including a first interior chamber and a second interior chamber; a differential pressure transducer situated between and separating said first and second interior chambers; a sensing mass in said first interior chamber comprising a solid sensing mass and a liquid sensing mass, said liquid sensing mass abutting said differential pressure transducer; a low density fluid in said second interior chamber; and means for adjusting the pressure in said second chamber.
Claim 3
Dependent Claim
60 words
The accelerometer of claim 1 wherein said first interior chamber further comprises a plurality of sections of different cross section areas diminishing towards said transducers and said solid sensing mass comprises at least one area of diminished cross section to engage with a corresponding section of said first interior chamber to form an expansible chamber containing said liquid sensing mass.
Claim 4
Dependent Claim
28 words
The accelerometer of claim 2 wherein the "g" load that said differential pressure transducer can withstand without damage is at least equal to two times its rated output.
Claim 5
Dependent Claim
59 words
The accelerometer of claim 3 wherein said means for adjusting pressure comprises a valve and said second interior chamber is pressurized to create a force on said transducer within the range from the force created by said sensing mass at equilibrium to the capacity of said transducer minus the maximum expected force to be created by said sensing mass.
Claim 6
Dependent Claim
14 words
The accelerometer of claim 4 wherein said first and second interior chambers are co-linear.
Claim 7
Dependent Claim
22 words
The accelerometer of claim 5 wherein said low density fluid is substantially insensitive to the range of "g" forces to be measured.
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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |