US4165503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic seismic sensor
Assignee: United States Department of the Army
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Filing: 1977-12-09
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Granted: 1979-08-21
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Expires: 1997-12-09
Abstract
Abstract A hydrostatic seismic sensor including a sensing mass suspended on a defoble reservoir containing a sensing fluid and a differential pressure transducer to measure the pressure in the reservoir.
Inventors
- 👤 Allen B. Holmes
- 👤 Stacy E. Gehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:53
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/18; G01V1/181
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A hydrostatic seismic accelerometer comprising: a housing including a first interior chamber; a sensing mass in said first chamber, said sensing mass having first and second coaxial cavities; an alignment pin attached to said housing and extending into said first cavity for maintaining the alignment of said sensing mass; a first flexible closed reservoir, containing a sensing fluid, extending into said first chamber and into said second cavity to support said sensing mass; a first spring encircling said alignment pin and biasing said sensing mass against said first reservoir; a mounting base connected to said housing, said base having a second interior chamber; a second flexible closed reservoir, containing a sensing fluid, extending into said second chamber; a second spring biased against said second reservoir; a differential pressure transducer having one side connected to said first reservoir and the other side connected to said second reservoir; and valve means for venting said second reservoir to the atmosphere.
Claim 2
Dependent Claim
157 words
A hydrostatic seismic accelerometer comprising: a housing including a first interior chamber; a sensing mass in said first chamber, said sensing mass having first and second coaxial cavities; an alignment pin attached to said housing and extending into said first cavity for maintaining the alignment of said sensing mass; a first flexible closed reservoir, containing a sensing fluid, extending into said first chamber and into said second cavity to support said sensing mass; a first spring encircling said alignment pin and biasing said sensing mass against said first reservoir; a mounting base connected to said housing, said base having a second interior chamber; a second flexible closed reservoir, containing a sensing fluid, extending into said second chamber; a second spring biased against said second reservoir; a differential pressure transducer having one side connected to said first reservoir and the other side connected to said second reservoir; and valve means for venting said second reservoir to the atmosphere.
Claim 3
Dependent Claim
48 words
The accelerometer of claim 1 further including a first adjustable means to alter the load on said first spring and a second adjustable means to alter the load on said second spring whereby the pressure in one reservoir can be balanced against the pressure in the other reservoir.
Claim 4
Dependent Claim
33 words
The accelerometer of claim 2 wherein said first reservoir comprises a first solid portion for engaging said sensing mass and said second reservoir comprises a second solid portion for engaging said second spring.
Claim 5
Dependent Claim
21 words
The accelerometer of claim 3 further including a valve means for filling or changing said sensing fluid in said first reservoir.
Claim 6
Dependent Claim
41 words
The accelerometer of claim 4 further including a groove in said first solid portion and a ball bearing resting in said groove and engaging said sensing mass to provide a stable contact surface between said first reservoir and said sensing mass.
References Cited (Backward Citations)
US2776829A
Cited
US3221562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |