US3812441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reed switch mechanism making use of heat-sensitive ferrite
Assignee: Nippon Automation Co Ltd
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Filing: 1972-11-27
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Granted: 1974-05-21
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Expires: 1992-11-27
Abstract
Abstract A temperature responsive switching device having at least one heat sensitive ferrite to determine the magnetic flux through a reed switch''s contilevered contacts and to produce switching when the temperature passes through said ferrite''s curie point.
Inventors
- 👤 M Sakamoto
- 👤 M Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:14
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/58; H01H37/585
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
The reed switch mechanism making use of heat-sensitive ferrites as claimed in claim 1, wherein between magnetic poles of permanent magnets opposite to magnetic poles, to which the heat sensitive ferrite is mounted, a permeable body having a curie point well above the expected maximum temperature to which said reed switch mechanism will be exposed, is provided.
Claim 2
Dependent Claim
69 words
The reed switch mechanism making use of heat-sensitive ferrites aS claimed in claim 1, wherein between magnetic poles of permanent magnets opposite to magnetic poles to which the heat sensitive ferrite is mounted, a heat sensitive ferrite, having a curie point in an expected temperature range to which said reed switch mechanism will be exposed and different in value from that of the other heat sensitive ferrite is mounted.
Claim 3
Dependent Claim
66 words
The reed switch mechanism making use of heat sensitive ferrites as claimed in claim 1, wherein an adjustable means, for setting a predetermined temperature for a switching operation of the reed switch body different from that of the curie point of said heat sensitive ferrite, is provided between magnetic poles of said permanent magnets opposite to the magnetic poles to which heat sensitive ferrite is mounted.
Claim 4
Dependent Claim
83 words
A temperature responsive magnetic bridge comprising: two permanent magnets being parallel and spaced, and their pole polarities inverted; a reed switch, having its longitudinal axis perpendicular to said magnets, connecting said magnets at their centers; at least one heat-sensitive ferrite mounted, substantially parallel to said longitudinal axis, between opposite poles of said permanet magnet; said reed switch assuming a first state at a temperature below a curie point of said heat-sensitive ferrite and a second state at a temperature above said curie point.
Claim 5
Dependent Claim
55 words
A temperature responsive magnetic bridge as in claim 5 including a second heat-sensitive ferrite having a curie point different from that of the other heat-sensitive ferrite mounted to remaining pair of opposite poles; said reed switch assuming a first state at temperatures between said two curie points and a second state for all other temperatures.
Claim 6
Dependent Claim
52 words
A temperature responsive magnetic bridge as in claim 5 including a permeable body adjustably mounted substantially parallel to said longitudinal axis and spaced from remaining pair of opposite poles; said reed switch changes states at a temperature which is other than said heat-sensitive ferrite''s curie point and is determined by said spacing.
Claim 7
Dependent Claim
61 words
A temperature responsive magnetic bridge as in claim 5 including a permeable body, having a curie point substantially higher than said ferrite''s curie point, mounted to the remaining pair of opposite poles so that said reed switch assuming said first state at a temperature above said ferrite''s curie point and said second state at a temperature below said ferrite''s curie point.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |