Kiyoshi Iwamoto

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Writing tool provided with refill
- Patent number 11,654,711
- Issue date May 23, 2023
- MITSUBISHI PENCIL COMPANY, LIMITED
- Takayuki Ikai
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Method for manufacturing ink follower for water base ballpoint pens
- Patent number 6,391,927
- Issue date May 21, 2002
- Mitsubishi Pencil Kabushikikaisha
- Norio Ogura
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Ink follower for water-base ballpoint pens and method of manufactur...
- Patent number 6,376,560
- Issue date Apr 23, 2002
- Mitsubishi Pencil Kabushikikaisha
- Norio Ogura
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Method of manufacturing ink follower for water-base ballpoint pens
- Patent number 6,227,738
- Issue date May 8, 2001
- Mitsubishi Pencil Kabushikikaisha
- Norio Ogura
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES

Patents Applicationslast 30 patents

Information Patent Application
WRITING TOOL PROVIDED WITH REFILL
- Publication number 20210178803
- Publication date Jun 17, 2021
- MITSUBISHI PENCIL COMPANY, LIMITED
- Takayuki IKAI
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES