Patent US4730103A successfully refreshed from Google Patents.
US4730103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact PTC resistance heater
Assignee: Control Devices LLC
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Filing: 1986-11-28
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Granted: 1988-03-08
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Expires: 2006-11-28
Abstract
Abstract A compact resistor heater device is disclosed comprising a resistor body of ceramic material having a positive temperature coefficient of resistance and having electrically conductive elements disposed upon the resistor body for conducting current from one side of a power supply to one side of the resistor body. The resistor device is encapsulated with a coating of thermally conductive material. In an alternate embodiment of the resistor heater device, a thermally conductive member is disposed in thermally conductive relationship to said resistor body and serves as a heat sink to dissipate the heat generated by the resistor body substantially uniformly over a greater area.
Inventors
- 👤 Donald R. Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:21
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; H05B3/10; H05B3/12; H05B3/14; H05B3/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A compact resistor heater device having a particular operating temperature comprising: a resistor body of ceramic material having a positive temperature coefficient of resistance; electrically conductive means disposed upon said resistor body for conducting current from opposite sides of a power supply to opposite sides of said resistor body; a thermally conductive member formed of a sheet of metal disposed in thermally conductive relationship to said resistor body; and a coating of thermally conductive material substantially free of voids entirely covering said resistor body and thermally conductive member.
Claim 2
Dependent Claim
88 words
A compact resistor heater device having a particular operating temperature comprising: a resistor body of ceramic material having a positive temperature coefficient of resistance; electrically conductive means disposed upon said resistor body for conducting current from opposite sides of a power supply to opposite sides of said resistor body; a thermally conductive member formed of a sheet of metal disposed in thermally conductive relationship to said resistor body; and a coating of thermally conductive material substantially free of voids entirely covering said resistor body and thermally conductive member.
Claim 3
Dependent Claim
19 words
The compact resistor heater device of claim 1 wherein the resistor body is formed of a ceramic titinate material.
Claim 4
Dependent Claim
23 words
The compact resistor heater device of claim 1 wherein said thermally conductive coating has a breakdown temperature in excess of said operating temperature.
Claim 5
Dependent Claim
32 words
The compact resistor heater device of claim 1 further comprising light means electrically connected to said resistor body and responsive to current flow through said resistor body at said particular operating temperature.
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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |