US4096464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermistor assembly having overload protection
Assignee: Control Devices LLC
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Filing: 1976-12-13
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Granted: 1978-06-20
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Expires: 1996-12-13
Abstract
Abstract A disc type thermistor has a low melting point metal rod disposed between the thermistor and a metal spring. The spring places the rod in compressive contact with one surface of the thermistor. When the thermistor overheats, the rod melts and opens the circuit.
Inventors
- 👤 Philip J. Dennis
- 👤 George H. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:52
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/0241; H01C; H01C1/00; H01C1/14; H01C1/1406; H01C7/00; H01C7/02; H01C7/04; H01H85/04; H01H85/041; H01H85/048; H01H2085/0483; H01H85/0039; H01H85/0047; H01H85/0052
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
124 words
A thermistor assembly comprising a base, a disc thermistor supported on said base, a lead-in wire electrically connected to one surface of the thermistor, an electrical connection from the second thermistor surface to a second lead-in wire comprising a low melting point metal rod placed in compressive electrical contact with the second surface by a flat metal spring connected to the second lead-in wire, and a stop on the base to prevent the spring from contacting the thermistor when the rod has melted, the thermistor providing normal electrical protection and the low melting point metal rod providing thermal overload protection, the melting temperature of the low melting point metal rod being higher than the temperature at which the thermistor undergoes sudden increase in resistance.
Claim 2
Dependent Claim
124 words
A thermistor assembly comprising a base, a disc thermistor supported on said base, a lead-in wire electrically connected to one surface of the thermistor, an electrical connection from the second thermistor surface to a second lead-in wire comprising a low melting point metal rod placed in compressive electrical contact with the second surface by a flat metal spring connected to the second lead-in wire, and a stop on the base to prevent the spring from contacting the thermistor when the rod has melted, the thermistor providing normal electrical protection and the low melting point metal rod providing thermal overload protection, the melting temperature of the low melting point metal rod being higher than the temperature at which the thermistor undergoes sudden increase in resistance.
Claim 3
Dependent Claim
16 words
The thermistor assembly of claim 1 wherein the rod composition is 60% tin - 40% lead.
References Cited (Backward Citations)
US3827014A
Cited
US3995246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |