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US3594547A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrical heaters

Assignee: SPACE AGE PRODUCTS SALES Ltd
•
Filing: 1968-12-17
•
Granted: 1971-07-20
•
Expires: 1988-12-17
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Abstract

Abstract An electrical heater for use in heating the engine, battery, seat or rear window of an automobile includes a thin, flexible rectangular heating pad embodying a composite electrical resistance sheet, a time switch mounted on the pad at a corner thereof and a pair of leads extending from the corner to provide for the operative connection of the heater to the vehicle battery. The pad comprises a resistance sheet composed of a flexible substrate of glass cloth having a coating of electrically resistive material on one surface. Header and distributor conductors an electrical contact with the face of the coating and connectable to said leads through the time switch are formed by a pair of elongated flexible braided wire electrodes extending sinuously across the coating and stitched to the sheet. Each electrode forms a plurality of U-shaped portions. The electrodes cross each other near their U-bases so that longitudinal stretches of one electrode alternate with longitudinal stretches of the other. The electrodes are electrically insulated from each other at the crossings.

Inventors

  • 👤 Joseph Thomas Quinn

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 20:30
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0225; B; B60; B60S; B60S1/00; B60S1/02; B60S1/56; B60S1/58; B60S1/586; H05B3/00; H05B3/20; H05B3/22; H05B3/26; H05B3/34; H05B3/342; H05B2203/00; H05B2203/002; H05B2203/005; H05B2203/011; H05B2203/013; H05B2203/017; H05B2203/029; H05B2203/033

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 120 words
An electrical heater including a heater element comprising a flexible sheet composed of a base layer of electrically insulative material and a coating of electrically resistive conducting material on the base layer, a pair of elongated flexible electrodes of braided wire in electrical contact with the face of the coating, each of the electrodes extending sinuously across the coating width in a plurality of elongated Uportions and one of the electrodes crossing the other near the Ubases so that longitudinal stretches of one electrode alternate with the longitudinal stretches of the other electrode, pieces of electrically insulative material between electrodes at the crossings, stitching securing the electrodes to the sheet, and means for connecting the electrodes to a power source.
Claim 2
Dependent Claim 120 words
An electrical heater including a heater element comprising a flexible sheet composed of a base layer of electrically insulative material and a coating of electrically resistive conducting material on the base layer, a pair of elongated flexible electrodes of braided wire in electrical contact with the face of the coating, each of the electrodes extending sinuously across the coating width in a plurality of elongated Uportions and one of the electrodes crossing the other near the Ubases so that longitudinal stretches of one electrode alternate with the longitudinal stretches of the other electrode, pieces of electrically insulative material between electrodes at the crossings, stitching securing the electrodes to the sheet, and means for connecting the electrodes to a power source.
Claim 3
Dependent Claim 23 words
An electrical heater according to claim 1, wherein the heating element includes a cover of electrically insulative flexible material enclosing the flexible sheet.
Claim 4
Dependent Claim 30 words
An electrical heater according to claim 1, including a time switch mounted on the heating element and in circuit with the electrodes to control the current flow through the sheet.
Claim 5
Dependent Claim 31 words
A heater according to claim 3, wherein the time switch is mounted on the heating element at a corner thereof, and a pair of external supply leads extend from said corner.
Claim 6
Dependent Claim 47 words
A heater according to claim 4, wherein the time switch is connected to one electrode and to an external lead connectable to the positive terminal of a vehicle battery, and the other external lead is connected to the other electrode and is connectable to the vehicle chassis.

References Cited (Backward Citations)

US1534220A Cited
US2392712A Cited
US2669646A Cited
US3156813A Cited
US3287684A Cited
US3385959A Cited
US3400254A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-07-19 1975-01-18 1975-07-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-07-19 1979-01-18 1979-07-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-07-19 1983-01-18 1983-07-20 $7700.00 Window Closed / Lapsed

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