US4023128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature responsive reed switch
Assignee: TDK Corp
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Filing: 1976-02-20
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Granted: 1977-05-10
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Expires: 1996-02-20
Abstract
Abstract A temperature responsive reed switch having magnetic reed pieces, a permanent magnet disposed near a contact of the reed switch and being magnetized in an axial direction of the reed switch, two temperature responsive magnetic materials disposed adjacent the ends of the permanent magnet in the axial direction of the reed switch and a magnetic yoke disposed adjacent the outer surfaces of the temperature responsive magnetic material.
Inventors
- 👤 Tomio Itou
- 👤 Michio Ishikawa
- 👤 Tokio Furuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:05
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/58; H01H37/585
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A temperature responsive reed switch comprising: a reed switch having magnetic reed pieces; a permanent magnet disposed near the contact of said reed switch and being magnetized in the axial direction of said reed switch; temperature responsive magnetic materials disposed upon opposite sides of said permanent magnet in the axial direction of said reed switch; and magnetic yoke means disposed about the outer surface of said temperature responsive magnetic materials and said permanent magnet for physically and magnetically protecting said materials and said magnet, and in contact with the said materials for absorbing and radiating heat from and to said materials.
Claim 2
Dependent Claim
101 words
A temperature responsive reed switch comprising: a reed switch having magnetic reed pieces; a permanent magnet disposed near the contact of said reed switch and being magnetized in the axial direction of said reed switch; temperature responsive magnetic materials disposed upon opposite sides of said permanent magnet in the axial direction of said reed switch; and magnetic yoke means disposed about the outer surface of said temperature responsive magnetic materials and said permanent magnet for physically and magnetically protecting said materials and said magnet, and in contact with the said materials for absorbing and radiating heat from and to said materials.
Claim 3
Dependent Claim
33 words
The temperature responsive reed switch according to claim 1 wherein two temperature responsive magnetic materials are disposed adjacent to both ends of said permanent magnet in the axial direction of the reed switch.
Claim 4
Dependent Claim
41 words
The temperature responsive reed switch according to claim 1, wherein said temperature responsive magnetic material has magnetic property when the temperature is lower than the Curie point and has no magnetic property when the temperature is higher than the Curie point.
Claim 5
Dependent Claim
20 words
The temperature responsive reed switch according to claim 1, wherein said magnetic yoke is in contact with said permanent magnet.
Claim 6
Dependent Claim
33 words
The temperature responsive reed switch according to claim 1, wherein said magnetic yoke completely covers the outer surfaces of said temperature responsive magnetic material, including the axial and the radial outer surfaces thereof.
Claim 7
Dependent Claim
19 words
The temperature responsive reed switch according to claim 1, wherein said magnetic yoke is separated from said permanent magnet.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |