# US 9,439,244 B2 · Heating cable comprising steel monofilaments

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- Number: US 9,439,244 B2
- Document ID: US9439244B2
- Status: Granted
- Kind: B2
- Application number: 14/005,961
- Filed: 2012-03-01
- Published: 2014-01-09
- Granted: 2016-09-06
- Earliest claimed: 2011-04-04
- Assignees: NV Bekaert SA
- Applicants: Steve Verstraeten
- Inventors: Steve Verstraeten
- Web page: https://patentgrep.com/patent/US9439244B2

## CPC

- H05B 3/02: Details
- H05B 3/12: characterised by the composition or nature of the conductive material
- H05B 3/342: {heaters used in textiles}
- H05B 3/56: Heating cables
- H05B 2203/02: Heaters using heating elements having a positive temperature coefficient
- H05B 2203/029: Heaters specially adapted for seat warmers
- H05B 2203/036: Heaters specially adapted for garment heating
- Y10T 29/49083: Heater type
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A new heating cable is described. The heating cable is comprising between seven and two hundred metallic monofilaments of a first type which are acting as electrical conductors to generate heat. The metallic monofilaments of a first type are having a diameter ranging from 30 μm to 100 μm. The metallic monofilaments of a first type are having a substantially round cross section. The metallic monofilaments of a first type are comprising a steel layer with a chromium content of less than 10% by weight. The heating cable is having an electrical resistance ranging between 0.1 Ω/m and 20.0 Ω/m when measured at 20° C.

## Claims

### Claim 1

A heating cable comprises between seven and two hundred metallic monofilaments of a first type, which are electrical conductors configured to generate heat,
wherein the metallic monofilaments of a first type have a diameter between 30 μm and 100 μm,
wherein the metallic monofilaments of a first type have a substantially round cross section,
wherein the metallic monofilaments of a first type comprise a steel layer with a chromium content of less than 10% by weight;
wherein the metallic monofilaments of a first type comprise a corrosion resistant coating layer;
wherein the heating cable comprises a metallic monofilament of a second type or one or more bundles of metallic monofilaments of a second type; and
wherein the metallic monofilament of the second type differs in composition from the metallic monofilament of the first type;
and wherein the heating cable has an electrical resistance ranging between 0.1 Ω/m and 20.0 Ω/m when measured at 20° C.

### Claim 2 (depends on 1)

The heating cable of claim 1, wherein the steel layer with a chromium content of less than 10% is a low carbon steel grade.

### Claim 3 (depends on 1)

The heating cable of claim 1, wherein the steel layer with a chromium content of less than 10% is a high carbon steel grade.

### Claim 4 (depends on 1)

The heating cable of claim 1, wherein the corrosion resistant coating is a metal coating selected from the group consisting of zinc, tin, silver, nickel, aluminum, or an alloy thereof.

### Claim 5 (depends on 1)

The heating cable of claim 1, wherein the corrosion resistant coating is a polymer.

### Claim 6 (depends on 1)

The heating cable of claim 1, wherein the heating cable has a corrosion resistant sheath.

### Claim 7 (depends on 6)

The heating cable of claim 6, wherein the corrosion resistant sheath comprises a polymer layer.

### Claim 8 (depends on 7)

The heating cable of claim 7, wherein the polymer layer comprises fluorine in the polymer.

### Claim 9

A method for making a heating cable with an electrical resistance ranging between 0.1 Ω/m and 20.0 Ω/m when measured at 20° C., the method comprising the steps of selecting between seven and two hundred metallic monofilaments of a first type, wherein the metallic monofilaments of the first type have a diameter ranging from 30 μm to 100 μm, wherein the metallic monofilaments of the first type have a substantially round cross section, wherein the metallic monofilaments of a first type comprise a steel layer with a chromium content of less than 10% by weight; and
selecting a metallic monofilament of a second type or one or more bundles of metallic monofilaments of the second type; and
twisting and/or cabling the monofilaments of the first type and the metallic monofilaments of the second type to form the heating cable.