Robert N. Keller

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Utica, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of manufacturing expanded reinforcing sheet material
- Patent number 4,297,154
- Issue date Oct 27, 1981
- National Steel Corporation
- Robert N. Keller
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Expanded reinforcing sheet material, its method of manufacture, and...
- Patent number 4,259,385
- Issue date Mar 31, 1981
- National Steel Corporation
- Robert N. Keller
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...