John C. Hartzell

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Trenton, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Workpiece finishing system and method of operating same
- Patent number 6,224,463
- Issue date May 1, 2001
- J.C.J. Metal Processing, Incorporated
- John C. Hartzell
- B24 - GRINDING POLISHING
Information Patent Grant
Self-clearing punch with removable blade
- Patent number 4,607,553
- Issue date Aug 26, 1986
- Hanger Hole Punches, Inc.
- John C. Hartzell
- B26 - HAND CUTTING TOOLS CUTTING SEVERING
Information Patent Grant
Punch with removable blade
- Patent number 4,494,426
- Issue date Jan 22, 1985
- John C. Hartzell
- B26 - HAND CUTTING TOOLS CUTTING SEVERING