US3785332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic pressure indicator
Assignee: Pall Corp
•
Filing: 1972-01-31
•
Granted: 1974-01-15
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Expires: 1992-01-31
Abstract
Abstract A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system. A loose nonmagnetic ball detent prevents resetting of the magnetic indicating means after actuation.
Inventors
- 👤 B Silverwater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:52
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/38; B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; H01H36/00; H01H36/0073
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
357 words
A magnetic pressure indicator which cannot be reset after actuation without inverting the device, thus foresTalling cancellation of the signal, comprising, in combination a first magnetic means spaced from and arranged to react with a second magnetic means so long as the two means are within their mutually reactive magnetic fields of force; first bias means to retain the first magnetic means in a first position with respect to the second magnetic means, the second magnetic means being normally retained in a second position; and second bias means to propel the second magnetic means from the second position to an indicating position whenever the spacing distance between the two magnetic means is changed, the first magnetic means being movable in response to changes in pressure, and normally biased in the first position with respect to the second magnetic means by a predetermined force, and the second magnetic means being normally biased by the bias means to an indicating position by a force capable of overcoming the force of magnetic reaction with the first means whenever the first and second magnetic means are spaced by a predetermined distance; a loose free-rolling nonmagnetic ball normally nesting in a recess opening into the path of the second magnetic means and retained in the recess by the second magnetic means while the means is magnetically reacted with the first magentic means, but whenever the second magnetic means moves a distance away from the first magnetic means sufficient to expose the recess, the ball rolls into the path of the second magnetic means and allows return of the second magnetic means only to a position where the spring-biasing force is still capable of overcoming the force of magnetic reaction between the second magnetic means and the first magnetic means, the recess being so arranged with respect to the second magnetic means that the ball cannot be returned to the recess by the second magnetic means in any normal orientation of the indicating device encountered under service, and the ball having a diameter greater than the distance within which the second magnetic means is reacted by magnetic force to the first magnetic means.
Claim 2
Dependent Claim
357 words
A magnetic pressure indicator which cannot be reset after actuation without inverting the device, thus foresTalling cancellation of the signal, comprising, in combination a first magnetic means spaced from and arranged to react with a second magnetic means so long as the two means are within their mutually reactive magnetic fields of force; first bias means to retain the first magnetic means in a first position with respect to the second magnetic means, the second magnetic means being normally retained in a second position; and second bias means to propel the second magnetic means from the second position to an indicating position whenever the spacing distance between the two magnetic means is changed, the first magnetic means being movable in response to changes in pressure, and normally biased in the first position with respect to the second magnetic means by a predetermined force, and the second magnetic means being normally biased by the bias means to an indicating position by a force capable of overcoming the force of magnetic reaction with the first means whenever the first and second magnetic means are spaced by a predetermined distance; a loose free-rolling nonmagnetic ball normally nesting in a recess opening into the path of the second magnetic means and retained in the recess by the second magnetic means while the means is magnetically reacted with the first magentic means, but whenever the second magnetic means moves a distance away from the first magnetic means sufficient to expose the recess, the ball rolls into the path of the second magnetic means and allows return of the second magnetic means only to a position where the spring-biasing force is still capable of overcoming the force of magnetic reaction between the second magnetic means and the first magnetic means, the recess being so arranged with respect to the second magnetic means that the ball cannot be returned to the recess by the second magnetic means in any normal orientation of the indicating device encountered under service, and the ball having a diameter greater than the distance within which the second magnetic means is reacted by magnetic force to the first magnetic means.
Claim 3
Dependent Claim
30 words
A magnetic pressure indicator according to claim 1, in which the second magnetic means is in the form of a piston, moving in a bore into which the recess opens.
Claim 4
Dependent Claim
21 words
A magnetic pressure indicator according to claim 1, in which the second magnetic means is a piston of high surface area.
Claim 5
Dependent Claim
23 words
A magnetic pressure indicator according to claim 1, in which at least one of the first and second bias means is a spring.
Claim 6
Dependent Claim
23 words
A magnetic pressure indicator according to claim 1, in which at least one of the first and second bias means is a magnet.
Claim 7
Dependent Claim
18 words
A magnetic pressure indicator according to claim 1, in which the recess is in the second magnetic means.
Claim 8
Dependent Claim
30 words
A magnetic pressure indicator according to claim 1, having a wall between the first and second magnetic means and the recess disposed in the wall opposite the second magnetic means.
Claim 9
Dependent Claim
23 words
A magnetic pressure indicator according to claim 1, in which the second magnetic means is arranged so as to become visible after actuation.
Claim 10
Dependent Claim
20 words
A magnetic pressure indicator according to claim 1, having the second magnetic means arranged so as to actuate a switch.
Claim 11
Dependent Claim
33 words
A magnetic pressure indicator according to claim 1, having a bimetallic means arranged to prevent movement of at least one of the first and second magnetic means at temperatures below a predetermined minimum.
Claim 12
Dependent Claim
19 words
A magnetic pressure indicator according to claim 1, in which both the first and second magnetic means are magnets.
Claim 13
Dependent Claim
27 words
A magnetic pressure indicator according to claim 1, in which one of the first and second magnetic means is a magnet, and one is of magnetizable material.
Claim 14
Dependent Claim
36 words
A magnetic pressure indicator according to claim 1, in which the first and second magnetic means are separated by a wall, both of the magnetic means are of magnetizable material, and the wall is a magnet.
Claim 15
Dependent Claim
27 words
A magnetic pressure indicator according to claim 1, in which one of the first and second magnetic means is a magnet and the wAll is a magnet.
Claim 16
Dependent Claim
19 words
A magnetic pressure indicator according to claim 1, in which the first and second magnetic means are mutually attracting.
Claim 17
Dependent Claim
19 words
A magnetic pressure indicator according to claim 1, in which the first and second magnetic means are mutually repelling.
Claim 18
Dependent Claim
46 words
A magnetic pressure indicator according to claim 1, in which the first magnetic means is spaced from and arranged to attract the second magnetic means, and the first bias means is arranged to retain the first magnetic means in a position towards the second magnetic means.
Claim 19
Dependent Claim
48 words
A magnetic pressure indicator according to claim 1, in which the first magnetic means is spaced from and arranged to repel the second magnetic means, and the first bias means is arranged to retain the first magnetic means in a first position away from the second magnetic means.
Claim 20
Dependent Claim
63 words
A magnetic pressure indicator according to claim 1, in which the first and second magnetic means are each spaced from and arranged to attract a keeper, and the first bias means is adapted to retain the first magnetic means in a first position towards the keeper, while the second bias means is adapted to propel the second magnetic means away from the keeper.
Claim 21
Dependent Claim
72 words
A magnetic pressure indicator according to claim 1, in which the first magnetic means is spaced from and arranged to repel a keeper, and the first bias means is arranged to retain the first magnetic means in a first position away from the keeper, while the second magnetic means is arranged to attract the keeper, and the second bias means is adapted to propel the second magnetic means away from the keeper.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |