Takashi Otowa

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Patents Grantslast 30 patents

Information Patent Grant
High-strength oil-tempered steel wire with excellent spring fabrica...
- Patent number 6,074,496
- Issue date Jun 13, 2000
- Suzuki Metal Industry Co., Ltd.
- Hiroshi Yarita
- C21 - METALLURGY OF IRON
Information Patent Grant
Manufacturing method of valve spring superior in durability
- Patent number 6,027,577
- Issue date Feb 22, 2000
- Chuo Hatsujo Kabushiki Kaisha
- Masaaki Mikura
- C21 - METALLURGY OF IRON
Information Patent Grant
Coil spring resistive to delayed fracture and manufacturing method...
- Patent number 6,017,641
- Issue date Jan 25, 2000
- Chuo Hatsujo Kabshiki Kaisha
- Toshinori Aoki
- C21 - METALLURGY OF IRON
Information Patent Grant
High strength spring steel and process for producing same
- Patent number 5,897,717
- Issue date Apr 27, 1999
- Nippon Steel Corporation
- Masayuki Hashimura
- C21 - METALLURGY OF IRON