Keiji Hasegawa

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Toyoake City, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for producing a helical spring
- Patent number 6,836,964
- Issue date Jan 4, 2005
- Chuo Hatsujo Kabushiki Kaisha
- Keiji Hasegawa
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method and apparatus for setting a helical compression spring
- Patent number 6,779,564
- Issue date Aug 24, 2004
- Chuo Hatsujo Kabushiki Kaisha
- Keiji Hasegawa
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Method and apparatus for producing a helical spring
- Patent number 6,648,996
- Issue date Nov 18, 2003
- Chuo Hatsujo Kabushiki Kaisha
- Keiji Hasegawa
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method for producing an inclined helical spring
- Patent number 6,550,301
- Issue date Apr 22, 2003
- Chuo Hatsujo Kabushiki Kaisha
- Keiji Hasegawa
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Curved helical compression spring
- Patent number 6,375,174
- Issue date Apr 23, 2002
- Chuo Hatsujo Kabushiki Kaisha
- Keiji Hasegawa
- B60 - VEHICLES IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
Method and apparatus for producing a helical spring
- Publication number 20030158620
- Publication date Aug 21, 2003
- CHUO HATSUJO KABUSHIKI KAISHA
- Keiji Hasegawa
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Method and apparatus for setting a helical compression spring
- Publication number 20030116219
- Publication date Jun 26, 2003
- Keiji Hasegawa
- B60 - VEHICLES IN GENERAL
Information Patent Application
Method and apparatus for producing a helical spring
- Publication number 20020046587
- Publication date Apr 25, 2002
- CHUO HATSUJO KABUSHIKI KAISHA
- Keiji Hasegawa
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Method for producing an inclined helical spring
- Publication number 20020011090
- Publication date Jan 31, 2002
- CHUO HATSUJO KABUSHIKI KAISHA
- Keiji Hasegawa
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Curved helical compression spring
- Publication number 20010011791
- Publication date Aug 9, 2001
- Keiji Hasegawa
- B60 - VEHICLES IN GENERAL