Patent US3815542A successfully refreshed from Google Patents.
US3815542A
Expired / Lapsed
US
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Magnetic pressure indicator
Assignee: Pall Corp
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Filing: 1972-07-27
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Granted: 1974-06-11
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Expires: 1992-07-27
Abstract
Abstract A magnetic differential pressure indicator is provided for detecting in a fluid system and indicating a pressure differential thereacross that is greater than a predetermined value. The magnetic indicating means is arranged to rotate about an axis after actuation, upon movement of a pressure-sensing piston towards or away from the indicating means.
Inventors
- 👤 R Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:11
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
192 words
A magnetic pressure indicator comprising, in combination, a reciprocable magnetic means spaced from and arranged to react with a rotatable magnetic means so long as the two means are within their mutually reactive magnetic fields of force, first bias means to retain the reciprocable magnetic means in a first position with respect to the rotatable magnetic means, the rotatable magnetic means being normally retained in a second position, aNd second bias means to propel the rotatable magnetic means about an axis of rotation at an angle to the axis of reciprocation of the reciprocable magnetic means, from the second position to an indicating position whenever the spacing distance between the two magnetic means is changed, the reciprocable magnetic means being reciprocable in response to changes in pressure, and normally biased in the first position with respect to the rotatable magnetic means by a predetermined force, and the rotatable magnetic means being normally biased by the bias means for rotation away from the reciprocable magnetic means by a force capable of overcoming the force of magnetic reaction with the reciprocable magnetic means whenever the two magnetic means are spaced by a predetermined distance.
Claim 2
Dependent Claim
192 words
A magnetic pressure indicator comprising, in combination, a reciprocable magnetic means spaced from and arranged to react with a rotatable magnetic means so long as the two means are within their mutually reactive magnetic fields of force, first bias means to retain the reciprocable magnetic means in a first position with respect to the rotatable magnetic means, the rotatable magnetic means being normally retained in a second position, aNd second bias means to propel the rotatable magnetic means about an axis of rotation at an angle to the axis of reciprocation of the reciprocable magnetic means, from the second position to an indicating position whenever the spacing distance between the two magnetic means is changed, the reciprocable magnetic means being reciprocable in response to changes in pressure, and normally biased in the first position with respect to the rotatable magnetic means by a predetermined force, and the rotatable magnetic means being normally biased by the bias means for rotation away from the reciprocable magnetic means by a force capable of overcoming the force of magnetic reaction with the reciprocable magnetic means whenever the two magnetic means are spaced by a predetermined distance.
Claim 3
Dependent Claim
28 words
A magnetic pressure indicator according to claim 1, in which the rotatable magnetic means is in the form of a ball, with a magnetic element diametrically disposed therein.
Claim 4
Dependent Claim
28 words
A magnetic pressure indicator according to claim 1, in which the rotatable magnetic means is in the form of a cylinder, with a magnetic element diametrally disposed therein.
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
19 words
A magnetic pressure indicator according to claim 1, in which both the reciprocable and rotatable magnetic means are magnets.
Claim 8
Dependent Claim
24 words
A magnetic pressure indicator according to claim 1, in which one of the magnetic means is a magnet, and one is of magnetizable material.
Claim 9
Dependent Claim
23 words
A magnetic pressure indicator according to claim 1, in which the rotatable 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 rotatable 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
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 13
Dependent Claim
27 words
A magnetic pressure indicator according to claim 11, in which one of the first and second magnetic means is a magnet and the wall is a magnet.
Claim 14
Dependent Claim
19 words
A magnetic pressure indicator according to claim 1, in which the reciprocable and rotatable magnetic means are mutually attracting.
Claim 15
Dependent Claim
19 words
A magnetic pressure indicator according to claim 1, in which the reciprocable and rotatable magnetic means are mutually repelling.
Claim 16
Dependent Claim
34 words
A magnetic pressure indicator according to claim 1, in which the rotatable magnetic means carries a stop means operatively engaging a stop member limiting rotation of the rotatable magnetic means to a predetermined arc.
Claim 17
Dependent Claim
16 words
A magnetic pressure indicator according to claim 15, in which the predetermined arc is approximately 180*.
Claim 18
Dependent Claim
46 words
A magnetic pressure indicator according to claim 1 in which the reciprocable magnetic means is spaced from and arranged to attract the rotatable magnetic means and the first bias means is arranged to retain the reciprocable magnetic means in a position towards the rotatable magnetic means.
Claim 19
Dependent Claim
48 words
A magnetic pressure indicator according to claim 1 in which the reciprocable magnetic means is spaced from and arranged to repel the rotatable magnetic means and the first bias means is arranged to retain the reciprocable magnetic means in a first position away from the rotatable magnetic means.
Claim 20
Dependent Claim
65 words
A magnetic pressure indicator according to claim 1 in which the reciprocable magnetic means and rotatable magnetic means are each spaced from and arranged to attract a keeper and the first bias means is arranged to retain the reciprocable magnetic means in a first position towardS the keeper while the second bias means is adapted to propel the rotatable magnetic means away from the keeper.
Claim 21
Dependent Claim
72 words
A magnetic pressure indicator according to claim 1 in which the reciprocable magnetic means is spaced from and arranged to repel a keeper and the first bias means is arranged to retain the reciprocable magnetic means in a first position away from the keeper while the rotatable magnetic means is arranged to attract the keeper and the second bias means is arranged to propel the rotatable magnetic means away from the keeper.
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |