Kenji Niwa

Follow

Person

Chiba, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Positive photoresist aqueous developer solution containing quaterna...
- Patent number 4,741,989
- Issue date May 3, 1988
- Sumitomo Chemical Company, Limited
- Kenji Niwa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Method of purifying tantalum
- Patent number 4,673,554
- Issue date Jun 16, 1987
- Sumitomo Chemical Company, Limited
- Kenji Niwa
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...