US4025755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatic electric cable heater
Assignee: WRAP ON CO Inc
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Filing: 1975-11-11
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Granted: 1977-05-24
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Expires: 1995-11-11
Abstract
Abstract An improved thermostatic electrical cable heater is disclosed which permits more accurate temperature sensing by the thermostat and better control over the temperature of the object being heated. This improved sensing and temperature control is accomplished by isolating the thermostat and its surrounding insulated envelope from the electrical resistance heating elements of the cable heater.
Inventors
- 👤 John W. Shirley
- 👤 James V. DePhillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:41
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/54; H05B3/56; G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; H01; H01H; H01H37/00; H01H37/02; H01H37/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
An electrical heating cable device, comprising: thin, flexible, elongated, electrically conductive, resistance heating elements embedded in flexible insulators; a thermostat, for controlling energization of the heating elements, enclosed in an insulated thermostat envelope and connected to the heating elements by insulated, low resistance electrical conductors, said heating elements being entirely outside of the thermostat envelope; and additional insulating envelope means for enclosing the points of attachment between the low resistance electrical conductors and the ends of the heating elements.
Claim 2
Dependent Claim
79 words
An electrical heating cable device, comprising: thin, flexible, elongated, electrically conductive, resistance heating elements embedded in flexible insulators; a thermostat, for controlling energization of the heating elements, enclosed in an insulated thermostat envelope and connected to the heating elements by insulated, low resistance electrical conductors, said heating elements being entirely outside of the thermostat envelope; and additional insulating envelope means for enclosing the points of attachment between the low resistance electrical conductors and the ends of the heating elements.
Claim 3
Dependent Claim
81 words
An electrical heating cable device, comprising: thin, flexible, elongated, electrically conductive, resistance heating elements embedded in flexible insulators; a thermostat for controlling energization of the heating elements; insulated, low resistance, electrically conductive leads for electrically connecting the thermostat to the heating elements; a thermostat insulating envelope enclosing the thermostat and only a portion of the low resistance leads; and additional insulating envelopes for enclosing the points of attachment between the low resistance electrical conductors and the ends of the heating elements.
Claim 4
Dependent Claim
81 words
An electrical heating cable device, comprising: thin, flexible, elongated, electrically conductive, resistance heating elements embedded in flexible insulators; a thermostat for controlling energization of the heating elements; insulated, low resistance, electrically conductive leads for electrically connecting the thermostat to the heating elements; a thermostat insulating envelope enclosing the thermostat and only a portion of the low resistance leads; and additional insulating envelopes for enclosing the points of attachment between the low resistance electrical conductors and the ends of the heating elements.
Claim 5
Dependent Claim
89 words
An electrical heating cable device, comprising: a relatively thin, flexible heating cable including an elongated, electrically conductive, resistance heating element enclosed in a flexible insulator; a thermostat for controlling energization of the heating element; an insulated, low resistance, electrically conductive lead for electrically connecting the thermostat to the heating element; a thermostat insulating envelope enclosing the thermostat and only a portion of the low resistance lead; and an additional insulating envelope for enclosing the point of attachment between the low resistance lead and the end of the heating element.
Claim 6
Dependent Claim
89 words
An electrical heating cable device, comprising: a relatively thin, flexible heating cable including an elongated, electrically conductive, resistance heating element enclosed in a flexible insulator; a thermostat for controlling energization of the heating element; an insulated, low resistance, electrically conductive lead for electrically connecting the thermostat to the heating element; a thermostat insulating envelope enclosing the thermostat and only a portion of the low resistance lead; and an additional insulating envelope for enclosing the point of attachment between the low resistance lead and the end of the heating element.
Claim 7
Dependent Claim
115 words
An electrical heating cable device, comprising: a relatively thin, flexible heating cable including an elongated, electrically conductive, resistance heating element enclosed in a flexible insulator; a thermostat for controlling energization of the heating element; an insulated, power supply cord connected to one end of the thermostat, an insulated low resistance, electrically conductive lead for electrically connecting the other end of the thermostat to the heating element; a thermostat insulating envelope enclosing the thermostat, the end of the supply cord connected to the thermostat and only a portion of the low resistance lead; and an additional insulating envelope for enclosing the point of attachment between the low resistance lead and the end of the heating element.
Claim 8
Dependent Claim
115 words
An electrical heating cable device, comprising: a relatively thin, flexible heating cable including an elongated, electrically conductive, resistance heating element enclosed in a flexible insulator; a thermostat for controlling energization of the heating element; an insulated, power supply cord connected to one end of the thermostat, an insulated low resistance, electrically conductive lead for electrically connecting the other end of the thermostat to the heating element; a thermostat insulating envelope enclosing the thermostat, the end of the supply cord connected to the thermostat and only a portion of the low resistance lead; and an additional insulating envelope for enclosing the point of attachment between the low resistance lead and the end of the heating element.
Claim 9
Dependent Claim
29 words
The electrical heating cable device of claim 4, wherein the end of the heating element not connected to the low resistance lead is connected to the electrical supply cord.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |