Robert G. Steffen

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Bluffton, IN, US

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Patents Grantslast 30 patents

Information Patent Grant
Self-locking threaded fastener and unlocking tool combination
- Patent number 4,309,140
- Issue date Jan 5, 1982
- Blough; LeVone A.
- Robert G. Steffen
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Tool and method for gaining legitimate entry into a locked enclosure
- Patent number 4,261,093
- Issue date Apr 14, 1981
- Gregory; David L.
- Robert G. Steffen
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR