Hajime Kawai

Person

Tsuzuki, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Phthalide compound and recording material using the compound
- Patent number 5,286,702
- Issue date Feb 15, 1994
- Yamada Chemical Co., Ltd.
- Yutaka Muraki
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Thermosensitive recording material
- Patent number 5,179,066
- Issue date Jan 12, 1993
- Yamada Chemical Co., Ltd.
- Manabu Yamada
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylami...
- Patent number 4,845,245
- Issue date Jul 4, 1989
- Yamada Chemical Co., Ltd.
- Yoshiharu Fujino
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Divinyl compounds and chromogenic recording-material prepared by us...
- Patent number 4,835,291
- Issue date May 30, 1989
- Yamada Chemical Co., Ltd.
- Hajime Kawai
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Heat-sensitive recording material
- Patent number 4,814,320
- Issue date Mar 21, 1989
- Yamada Chemical Co., Ltd.
- Hajime Kawai
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Divinyl compounds and chromogenic recording-material prepared by us...
- Patent number 4,808,567
- Issue date Feb 28, 1989
- Yamada Chemical Co., Ltd.
- Hajime Kawai
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Chromogenic azaphthalide compound and a colour-forming recording co...
- Patent number 4,747,875
- Issue date May 31, 1988
- Yamada Chemical Co., Ltd.
- Hajime Kawai
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Chromogenic compounds
- Patent number 4,564,679
- Issue date Jan 14, 1986
- Yamada Chemical Co., Ltd.
- Yoshiharu Fujino
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Chromogenic compounds and the use thereof as color former in copyin...
- Patent number 4,444,591
- Issue date Apr 24, 1984
- Yamada Chemical Co., Ltd.
- Hajime Kawai
- C07 - ORGANIC CHEMISTRY

Hajime Kawai

Person

Patents Grantslast 30 patents

Phthalide compound and recording material using the compound

Thermosensitive recording material

Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylami...

Divinyl compounds and chromogenic recording-material prepared by us...

Heat-sensitive recording material

Divinyl compounds and chromogenic recording-material prepared by us...

Chromogenic azaphthalide compound and a colour-forming recording co...

Chromogenic compounds

Chromogenic compounds and the use thereof as color former in copyin...