US4379407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for conducting resonance measurements of rock materials under confining pressure
Assignee: Mobil Oil AS
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Filing: 1981-05-01
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Granted: 1983-04-12
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Expires: 2001-05-01
Abstract
Abstract A confining pressure system includes a pressure cell containing a mechanical oscillator and a gas supply for carrying out resonance measurements of rock material under confining pressure at seismic frequencies. An appropriate gas is used to avoid significant damping of oscillations under confining pressures of various ranges.
Inventors
- 👤 Lucien Masse
- 👤 William L. Medlin
- 👤 James H. Sexton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:04
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N33/00; G01N33/24; G01N33/241; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
In a system for measuring resonance characteristics of rock material under an oscillatory driving force, the improvement comprising: (a) means for enclosing said rock material under confining pressure, (b) means for adjusting the confining pressure without introducing significant viscous damping in the oscillations, and (c) means for controlling pore pressure within said rock material independently of said confining pressure.
Claim 2
Dependent Claim
59 words
In a system for measuring resonance characteristics of rock material under an oscillatory driving force, the improvement comprising: (a) means for enclosing said rock material under confining pressure, (b) means for adjusting the confining pressure without introducing significant viscous damping in the oscillations, and (c) means for controlling pore pressure within said rock material independently of said confining pressure.
Claim 3
Dependent Claim
34 words
The system of claim 1 wherein said pore pressure controlling means includes: (a) a gas supply, and (b) a passage way connecting said gas supply to at least one end of said rock material.
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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |