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US3750064A
Expired / Lapsed
US
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Temperature-operated switch
Assignee: Tokin Corp
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Filing: 1971-05-18
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Granted: 1973-07-31
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Expires: 1991-05-18
Abstract
Abstract A thermostat comprises a reed switch having a pair of normally open contacts, a barium-ferrite permanent magnet disposed parallel to the reed switch, and a manganese-zinc group ferrite member positioned proximate the permanent magnet to form a series circuit for the magnetic flux of the permanent magnet. The ferrite member exhibits a stauration magnetic flux density characteristic varying in response to temperature changes whereby the reed switch contacts are closed.
Inventors
- 👤 U Kato
- 👤 M Endo
- 👤 K Kamata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:29
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/58; H01H37/585
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
12 words
a barium-ferrite permanent magnet disposed substantially parallel to said reed switch; and
Claim 2
Dependent Claim
5 words
A temperature-operated switch, which comprises:
Claim 3
Dependent Claim
20 words
a rectangular permanent magnet having four side faces, the permanent magnet being arranged substantially parallel to the reed switch; and
Claim 4
Dependent Claim
10 words
a permanent magnet arranged substantially parallel to the reed switch;
Claim 5
Dependent Claim
96 words
a magnetic member positioned proximate the permanent magnet and forming therewith a series circuit for the magnetic flux of the permanent magnet, the series circuit including the magnetic member and the reeds of the switch, a. the magnetic member being comprised of a material exhibiting a saturation magnetic flux density characteristic varying in response to changes in temperature whereby the contacts of the reed switch are opened and closed by variations in the intensity and distribution of the magnetic flux from the permanent magnet caused by temperature induced variations in the characteristic of the magnetic member;
Claim 6
Dependent Claim
64 words
a magnetic member adjacent and surrounding the four side faces of the permanent magnet, a. the magnetic member being disposed substantially parallel to the reed switch and forming therewith a series circuit for the magnetic flux of the permanent magnet, and b. the magnetic member being comprised of a material exhibiting a saturation magnetic flux density characteristic varying in response to changes in temperature.
Claim 7
Dependent Claim
16 words
The temperature-operated switch of claim 2, wherein the magnetic member material is a manganese-zinc group ferrite.
Claim 8
Dependent Claim
96 words
at least one manganese-zinc group ferrite member positioned proximate said permanent magnet such that a series circuit is formed for the magnetic flux of said magnet, said series circuit including said ferrite member and the reeds of said reed switch, said ferrite member exhibiting a saturation magnetic flux density characteristic which varies in response to changes in temperature, whereby the contacts of said reed switch are opened and closed by variations in the intensity and distribution of the magnet flux from said magnet caused by temperature induced variations in the magnetic characteristic of said ferrite member.
Claim 9
Dependent Claim
5 words
A temperature-operated switch, which comprises:
Claim 10
Dependent Claim
36 words
an electromagnetic coil mounted adjacent the magnetic member and arranged, upon energization, to alter the saturation magnetic flux density characteristic of the magnetic member whereby the temperature at which the switch operates may be adjusted; and
Claim 11
Dependent Claim
11 words
means for energizing the coil to establish an electromagnetic field therein.
Claim 12
Dependent Claim
34 words
The temperature-operated switch of claim 4, wherein the permanent magnet and magnetic member are ring-shaped and coaxially surround the reed switch and the electromagnetic coil is coaxial with the permanent magnet and magnetic member.
Claim 13
Dependent Claim
16 words
The temperature-operated switch of claim 4, wherein the magnetic member material is a manganese-zinc group ferrite.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |