David Yen

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Tao-Yuan Hsien, TW

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Patents Grantslast 30 patents

Information Patent Grant
System and method for recovering PTA mother liquid and purifying an...
- Patent number 7,314,954
- Issue date Jan 1, 2008
- Mechema Chemicals International Corp.
- David Yen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
System and method for recovering CTA residues and purifying/regener...
- Patent number 7,285,677
- Issue date Oct 23, 2007
- Mechema Chemicals International Corp.
- David Yen
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...

Patents Applicationslast 30 patents

Information Patent Application
METHOD OF MANUFACTURING PTA OXIDIZED CATALYST WITH LOWER CORROSION
- Publication number 20080103332
- Publication date May 1, 2008
- David YEN
- C07 - ORGANIC CHEMISTRY
Information Patent Application
Catalytic solution system for manufacturing terephthalic acid and a...
- Publication number 20030078451
- Publication date Apr 24, 2003
- Mechema Chemicals International Corp.
- David Yen
- C07 - ORGANIC CHEMISTRY