Hak Soo Chang

Follow

Person

Sungnam, KR

People

Patents Grantslast 30 patents

Information Patent Grant
Ultrasonic flow velocity measuring method
- Patent number 6,470,757
- Issue date Oct 29, 2002
- Chang Min Tech Co., Ltd.
- Hak Soo Chang
- G01 - MEASURING TESTING
Information Patent Grant
Ultrasonic flow velocity measuring method using phase difference me...
- Patent number 6,386,047
- Issue date May 14, 2002
- Chang Min Tech Co., Ltd.
- Hak Soo Chang
- G01 - MEASURING TESTING
Information Patent Grant
Ultrasonic flow meter using transit time across tube chords for det...
- Patent number 6,089,104
- Issue date Jul 18, 2000
- Hak Soo Chang
- G01 - MEASURING TESTING
Information Patent Grant
Ultrasonic flow velocity measuring apparatus
- Patent number 6,012,338
- Issue date Jan 11, 2000
- Chang Min Tech Co., Ltd.
- Hak Soo Chang
- G01 - MEASURING TESTING
Information Patent Grant
Method of measuring a river horizontal average flow velocity
- Patent number 5,952,583
- Issue date Sep 14, 1999
- Chang Min Tech Co., Ltd.
- Hak Soo Chang
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
Ultrasonic flow velocity measuring method
- Publication number 20010037676
- Publication date Nov 8, 2001
- Hak Soo Chang
- G01 - MEASURING TESTING
Information Patent Application
Ultrasonic flow velocity measuring method
- Publication number 20010037688
- Publication date Nov 8, 2001
- Chang Min Tech Co., and Hak Soo CHANG
- Hak Soo Chang
- G01 - MEASURING TESTING