Ryuzo Yamamoto

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Osaka, JP

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Patents Grantslast 30 patents

Information Patent Grant
Eraser
- Patent number 7,341,635
- Issue date Mar 11, 2008
- Sakura Color Products Corporation
- Shinichiro Hayashi
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Eraser
- Patent number 7,316,841
- Issue date Jan 8, 2008
- Sakura Color Products Corporation
- Shinichiro Hayashi
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Abrasive solid
- Patent number 6,929,669
- Issue date Aug 16, 2005
- Sakura Color Products Corporation
- Nakao Tominaga
- B24 - GRINDING POLISHING
Information Patent Grant
Solid drawing composition
- Patent number 5,407,472
- Issue date Apr 18, 1995
- Sakura Color Products Corporation
- Ryuzo Yamamoto
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

Patents Applicationslast 30 patents

Information Patent Application
Eraser
- Publication number 20070065654
- Publication date Mar 22, 2007
- Sakura Color Products Corporation
- Shinichiro Hayashi
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Application
Abrasive solid
- Publication number 20040035058
- Publication date Feb 26, 2004
- SAKURA COLOR PRODUCTS CORPORATION
- Nakao Tominaga
- B24 - GRINDING POLISHING
Information Patent Application
Abrasive solid
- Publication number 20020178658
- Publication date Dec 5, 2002
- Nakao Tominaga
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...