Nicholas Herbert

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Baltimore, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Piston ring with chrome-filled groove
- Patent number 4,307,890
- Issue date Dec 29, 1981
- John E. Cromwell
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of making piston rings with chrome-filled grooves
- Patent number 4,176,434
- Issue date Dec 4, 1979
- Koppers Company, Inc.
- John E. Cromwell
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR