Patent US5246436A successfully refreshed from Google Patents.
US3665296A
Expired / Lapsed
US
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Susceptibility meter for field use for determining susceptibility of a rock outcrop
Assignee: CANADIAN PARTS AND DEV Ltd
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Filing: 1969-12-16
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Granted: 1972-05-23
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Expires: 1989-12-16
Abstract
Abstract A method and apparatus measures susceptibility of a rock specimen by measuring the change of the equilibrium forces acting upon an electromagnet. The displacement of the magnet from equilibrium is detected in any one of a number of ways and is translated into an error signal which is amplified and coupled so as to give rise to a force which always opposes any displacement and which tends to reduce it to zero. When the magnet is again in equilibrium the force to keep it so against the added influence of the rock specimen is measured and gives the susceptibility.
Inventors
- 👤 Harry Gross
- 👤 David T Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:59
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12; G01R33/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
191 words
A susceptibility meter adapted for field use comprising: a supporting structure having a base suitable for placement upon a rock outcrop, a magnet means above the support structure base; a resilient means connecting said magnet means to said support structure, the magnet means having sufficient weight relative to the resiliency of the connecting means to appreciably move said magnet means downwardly to establish an equilibrium position relative to said base in the absence of a rock outcrop; means for sensing the magnitude and direction of the displacement of the magnet means from said equilibrium position when said support structure base is placed upon a rock outcrop; means for applying a substantially vertical restoring force in a direction to return said magnet means to said equilibrium position; operating means connected to said sensing means and said restoring force applying means for reducing the restoring force as the magnet means approaches said equilibrium position to that static force required to maintain said magnet means at said equilibrium position; means to measure said static force; and damping fluid means adapted to cooperate with said magnet means to inhibit oscillation thereof about said equilibrium position.
Claim 2
Dependent Claim
191 words
A susceptibility meter adapted for field use comprising: a supporting structure having a base suitable for placement upon a rock outcrop, a magnet means above the support structure base; a resilient means connecting said magnet means to said support structure, the magnet means having sufficient weight relative to the resiliency of the connecting means to appreciably move said magnet means downwardly to establish an equilibrium position relative to said base in the absence of a rock outcrop; means for sensing the magnitude and direction of the displacement of the magnet means from said equilibrium position when said support structure base is placed upon a rock outcrop; means for applying a substantially vertical restoring force in a direction to return said magnet means to said equilibrium position; operating means connected to said sensing means and said restoring force applying means for reducing the restoring force as the magnet means approaches said equilibrium position to that static force required to maintain said magnet means at said equilibrium position; means to measure said static force; and damping fluid means adapted to cooperate with said magnet means to inhibit oscillation thereof about said equilibrium position.
Claim 3
Dependent Claim
189 words
A susceptibility meter adapted for field use comprising: a tube having a base suitable for placement upon a rock outcrop; a magnet means within said tube above said base; a resilient means connecting said magnet means to said tube, the magnet means having sufficient weight relative to the resiliency of the connecting means to move said magnet means downwardly to establish an equilibrium position relative to said base in the absence of a rock outcrop; a means for sensing the displacement of the magnet means from said equilibrium position when said support structure base is placed upon a rock outcrop; means for applying a substantially vertical restoring force in a direction to return said magnet means to said equilibrium position; an operating means connected to said sensing means and said restoring force applying means for reducing the restoring force as the magnet means approaches said equilibrium position to that static force required to maintain said magnet means at said equilibrium position; means to measure said static force; and a damping fluid within said tube adapted to cooperate with said magnet means to inhibit oscillation thereof about said equilibrium position.
Claim 4
Dependent Claim
189 words
A susceptibility meter adapted for field use comprising: a tube having a base suitable for placement upon a rock outcrop; a magnet means within said tube above said base; a resilient means connecting said magnet means to said tube, the magnet means having sufficient weight relative to the resiliency of the connecting means to move said magnet means downwardly to establish an equilibrium position relative to said base in the absence of a rock outcrop; a means for sensing the displacement of the magnet means from said equilibrium position when said support structure base is placed upon a rock outcrop; means for applying a substantially vertical restoring force in a direction to return said magnet means to said equilibrium position; an operating means connected to said sensing means and said restoring force applying means for reducing the restoring force as the magnet means approaches said equilibrium position to that static force required to maintain said magnet means at said equilibrium position; means to measure said static force; and a damping fluid within said tube adapted to cooperate with said magnet means to inhibit oscillation thereof about said equilibrium position.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |