Robert A. Johnson

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Minnetonka, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of aligning a precision grinding wheel assembly
- Patent number 4,297,781
- Issue date Nov 3, 1981
- Magnetic Peripherals Inc.
- Douglas J. Hennenfent
- B24 - GRINDING POLISHING
Information Patent Grant
Method of manufacturing narrow track ferrite head cores
- Patent number 4,279,102
- Issue date Jul 21, 1981
- Magnetic Peripherals Inc.
- Douglas J. Hennenfent
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Precision grinding wheel mount
- Patent number 4,236,355
- Issue date Dec 2, 1980
- Control Data Corporation
- Douglas J. Hennenfent
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of machining vise jaw face
- Patent number 4,006,525
- Issue date Feb 8, 1977
- Control Data Corporation
- Douglas J. Hennenfent
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Resilient vise jaw
- Patent number 3,951,395
- Issue date Apr 20, 1976
- Control Data Corporation
- Douglas J. Hennenfent
- B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS