Yuji Matoba

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for detecting surface flaws
- Patent number 5,835,220
- Issue date Nov 10, 1998
- NKK Corporation
- Akira Kazama
- G01 - MEASURING TESTING
Information Patent Grant
Method and apparatus for detecting defective portion on outer surfa...
- Patent number 4,988,210
- Issue date Jan 29, 1991
- NKK Corporation
- Toshio Koshihara
- G01 - MEASURING TESTING
Information Patent Grant
Method for detecting thinned out portion on inner surface or outer...
- Patent number 4,983,836
- Issue date Jan 8, 1991
- NKK Corporation
- Yuji Matoba
- G01 - MEASURING TESTING
Information Patent Grant
Method and apparatus for detecting defective portion on inner surfa...
- Patent number 4,872,762
- Issue date Oct 10, 1989
- NKK Corporation
- Toshio Koshihara
- G01 - MEASURING TESTING