# US 8,740,007 B2 · Cooking utensil and manufacturing method thereof

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- Number: US 8,740,007 B2
- Document ID: US8740007B2
- Status: Granted
- Kind: B2
- Application number: 12/973,913
- Filed: 2010-12-21
- Published: 2012-05-10
- Granted: 2014-06-03
- Earliest claimed: 2010-11-08
- Assignees: Industrial Technology Research Institute
- Applicants: Ming-Sheng Leu; Wu-Han Liu; Wei-Tien Hsiao; Chang-Chih Hsu; Mao-Shin Liu; Zhong-Ren Wu
- Inventors: Ming-Sheng Leu; Wu-Han Liu; Wei-Tien Hsiao; Chang-Chih Hsu; Mao-Shin Liu; Zhong-Ren Wu
- Web page: https://patentgrep.com/patent/US8740007B2

## CPC

- A47J 36/02: Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
- A47J 27/022: with enlarged bottom
- Y10T 428/131: Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cooking utensil and a manufacturing method thereof are provided. The cooking utensil includes a cooking body, a first metal-ceramic composite layer having an electromagnetic property and a second metal-ceramic composite layer having a heat conductive property. The cooking body has an external bottom surface. The first metal-ceramic composite layer is disposed on the external bottom surface of the cooking body. The second metal-ceramic composite layer is disposed on the first metal-ceramic composite layer. The cooking utensil is suitable for both an induction cooker and a gas burner.

## Claims

### Claim 1

A cooking utensil, comprising:
a cooking body having an external bottom surface, wherein the cooking body does not have an electromagnetic property;
a first metal-ceramic composite layer having an electromagnetic property disposed on the external bottom surface of the cooking body, wherein a metal portion of the first metal-ceramic composite layer comprises iron, cobalt, nickel, or an alloy thereof, a ceramic portion of the first metal-ceramic composite layer comprises iron oxide, cobalt oxide, nickel oxide, or a combination thereof, and the metal portion accounts for 50 wt % to 85 wt % of the first metal-ceramic composite layer;
a second metal-ceramic composite layer having a heat conductive property disposed on the first metal-ceramic composite layer, wherein the second metal-ceramic composite layer contacts an external environment, and wherein a metal portion of the second metal-ceramic composite layer comprises aluminum or an alloy thereof, a ceramic portion of the second metal-ceramic composite layer comprises aluminum oxide, and the metal portion accounts for 20 wt % to 85 wt % of the second metal-ceramic composite layer; and
a third metal-ceramic composite layer having an electromagnetic property disposed between the external bottom surface of the cooking body and the first metal-ceramic composite layer, wherein the third metal-ceramic composite layer and the first metal-ceramic composite layer are fabricated with different materials.

### Claim 2 (depends on 1)

The cooking utensil as claimed in claim 1, wherein a material of the cooking body comprises aluminum, copper, silver, titanium, or an alloy thereof.

### Claim 3 (depends on 1)

The cooking utensil as claimed in claim 1, wherein a thickness of the first metal-ceramic composite layer ranges from 150 μm to 1.2 mm and a thickness of the second metal-ceramic composite layer ranges from 50 μm to 200 μm.

### Claim 4 (depends on 1)

The cooking utensil as claimed in claim 1, wherein the first metal-ceramic composite layer and the second metal-ceramic composite layer are disposed on the external bottom surface entirely or partially in a circular, a spiral, or a concentric circular manner.

### Claim 5 (depends on 1)

The cooking utensil as claimed in claim 1, wherein a tensile bond value between the first metal-ceramic composite layer and the external bottom surface of the cooking body is larger than 4000 Psi.

### Claim 6 (depends on 1)

The cooking utensil as claimed in claim 1, wherein an average residual value of a Gaussian value of the first metal-ceramic composite layer is larger than 3 G and a center residual value of the Gaussian value of the first metal-ceramic composite layer is larger than 6 G.