Akihisa Yahagi

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Hitachinaka, JP

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Patents Grantslast 30 patents

Information Patent Grant
Portable electric hammer
- Patent number D477206
- Issue date Jul 15, 2003
- Hitachi Koki Co., Ltd.
- Masato Sakai
- D08 - Tools and hardware
Information Patent Grant
Tool-bit holding device in percussion tool
- Patent number 6,497,418
- Issue date Dec 24, 2002
- Hitachi Koki Co., Ltd.
- Akihisa Yahagi
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Grant
Percussion tool
- Patent number 6,155,356
- Issue date Dec 5, 2000
- Hitachi Koki Co., Ltd.
- Atsuyuki Kikuchi
- B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
Information Patent Grant
Holding device for percussion tool
- Patent number 5,971,403
- Issue date Oct 26, 1999
- Hitachi Koko Co., Ltd.
- Akihisa Yahagi
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Vibration-damping structure for electric hammer
- Patent number 5,522,466
- Issue date Jun 4, 1996
- Hitachi Koki Company Limited
- Mutsuo Harada
- B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS

Patents Applicationslast 30 patents

Information Patent Application
Tool-bit holding device in percussion tool
- Publication number 20010013683
- Publication date Aug 16, 2001
- HITACHI KOKI CO., LTD.
- Akihisa Yahagi
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC