# US 6,794,980 B2 · Over-current protection apparatus and method for making the same

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- Number: US 6,794,980 B2
- Document ID: US6794980B2
- Status: Granted
- Kind: B2
- Application number: 10/265,858
- Filed: 2002-10-07
- Published: 2003-04-10
- Granted: 2004-09-21
- Earliest claimed: 2001-10-08
- Assignees: Polytronics Technology Corp.
- Inventors: Edward Fu-Hua Chu; David Shau-Chew Wang; Yun-Ching Ma
- Web page: https://patentgrep.com/patent/US6794980B2

## CPC

- H01C 3/06: Flexible or folding resistors, whereby such a resistor can be looped or collapsed upon itself
- H01C 7/13: current-responsive
- H01C: RESISTORS

## Abstract

The present invention discloses an over-current protection apparatus, comprising a current-sensitive element, a first electrode and a second electrode. The over-current protection apparatus of the present invention is a three-dimensional multi-layer structure, and can be formed by heating, pressing, etching, cutting and multi-stage deformation to prevent it from breakage during the bending process. Therefore, the over-current protection apparatus with at least one bend is formed.

## Claims

### Claim 1

An over-current protection apparatus comprising:
a current-sensitive element having positive temperature coefficient and being in the form of a bending structure including two straight portions and an are connected therebetween, wherein the two straight portions are inclined at an external angle from 90 to 180 degrees;
a first electrode adhered to one surface of said current-sensitive element; and
a second electrode adhered to another surface of said current-sensitive element;
wherein said current-sensitive element is laminated between said first and second electrodes, and at least one of said first and second electrodes includes at least two electrode members separated by at least one opening located on an inside center of said arc.

### Claim 2 (depends on 1)

The over-current protection apparatus of claim 1, wherein said first electrode includes at least two electrode members spaced by at least one opening located on an inside center of the are of said bending structure.

### Claim 3 (depends on 1)

The over-current protection apparatus of claim 1, wherein said second electrode includes at least two electrode members spaced by at least one opening located on an inside center of the are of said bending structure.

### Claim 4 (depends on 1)

The over-current protection apparatus of claim 1, further comprising a first conductive metal termination adhered to said first electrode.

### Claim 5 (depends on 1)

The over-current protection apparatus of claim 1, further comprising a second conductive metal termination adhered to said second electrode.

### Claim 6 (depends on 2)

The over-current protection apparatus of claim 2, wherein said opening is filled with a conductive material.