Patent US3675171A successfully refreshed from Google Patents.
US3675171A
Expired / Lapsed
US
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Magnetically operable device
Assignee: Martonair Ltd
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Filing: 1970-12-16
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Granted: 1972-07-04
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Expires: 1990-12-16
Abstract
Abstract A magnetically operable valve or like device including a movable member and a fixed member, each including a magnetic material. The movable member is movable between positions remote from and adjacent the fixed member so that when the magnetic material of one of said members is magnetized and when said movable member is moved to a position adjacent the fixed member, a magnetic field is produced in the fixed member. The valve or like device also includes a movable magnetic element supported adjacent the side of the fixed member remote from the movable member and biased into an initial position from which it is movable by said magnetic field against the bias when the movable member is moved adjacent said fixed member.
Inventors
- 👤 Colin John Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:18
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
A magnetically operable device comprising a movable member and a fixed member, each of said members including a magnetic material, said movable member being supported to be movable between positions remote from and adjacent said fixed member so that when the magnetic material of said movable member is magnetized and when said movable member is moved to a position adjacent said fixed member, a magnetic field is produced in said fixed member, the device also comprising a movable magnetic element supported adjacent the side of the fixed member remote from said movable member and biased into an initial position from which it is movable by said magnetic field against the bias when said movable member is moved adjacent said fixed member, the movable member having a face formed with a groove defined between an outer periphery, which constitutes one pole when the magnetic material of the movable member is magnetized, and an inner portion which constitutes the other pole when the magnetic material of the movable member is magnetized, said face being arranged to be closely adjacent said fixed member when said movable member is moved into its adjacent position.
Claim 2
Dependent Claim
190 words
A magnetically operable device comprising a movable member and a fixed member, each of said members including a magnetic material, said movable member being supported to be movable between positions remote from and adjacent said fixed member so that when the magnetic material of said movable member is magnetized and when said movable member is moved to a position adjacent said fixed member, a magnetic field is produced in said fixed member, the device also comprising a movable magnetic element supported adjacent the side of the fixed member remote from said movable member and biased into an initial position from which it is movable by said magnetic field against the bias when said movable member is moved adjacent said fixed member, the movable member having a face formed with a groove defined between an outer periphery, which constitutes one pole when the magnetic material of the movable member is magnetized, and an inner portion which constitutes the other pole when the magnetic material of the movable member is magnetized, said face being arranged to be closely adjacent said fixed member when said movable member is moved into its adjacent position.
Claim 3
Dependent Claim
53 words
A magnetically operable device as claimed in claim 1 in which the fixed member comprises an outer portion of magnetic material complementary to said outer periphery, an inner core of magnetic material complementary to said inner portion, and a ring of non-magnetic material between said outer portion and core complementary to said groove.
Claim 4
Dependent Claim
29 words
A magnetically operable device as claimed in claim 2 in which the said outer periphery is annular and the inner portion is cylindrical and co-axial with said outer periphery.
Claim 5
Dependent Claim
21 words
A magnetically operable device as claimed in claim 1 in which the magnetic material of the fixed member is permanently magnetized.
Claim 6
Dependent Claim
22 words
A magnetically operable device as claimed in claim 1 in which the fixed member is supported by a wall of non-magnetic material.
Claim 7
Dependent Claim
34 words
A magnetically operable device as claimed in claim 5 in which said movable member and said movable magnetic elements are biased in opposite directions against opposite sides of the wall by respective spring means.
Claim 8
Dependent Claim
56 words
A magnetically operable device as claimed in claim 6 in which the wall of non-magnetic material forms part of a valve device, the wall dividing the valve device into a pair of chambers, the movable member being positioned in one of the chambers and the movable magnetic element being arranged in the other of the chambers.
Claim 9
Dependent Claim
18 words
A magnetically operable device as claimed in claim 1 in which the movable magnetic element is magnetized permanently.
Claim 10
Dependent Claim
21 words
A magnetically operable device as claimed in claim 1 in which the magnetic material of said movable member is magnetized permanently.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |