John Edward Cromwell

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Baltimore, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Piston ring coatings
- Patent number 4,334,927
- Issue date Jun 15, 1982
- Glenn F. Hyde
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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
Information Patent Grant
Bearing member having a wear resistant coating on its bearing face
- Patent number 3,938,814
- Issue date Feb 17, 1976
- Koppers Company, Inc.
- John E. Cromwell
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Bearing members having coated wear surfaces
- Patent number 3,936,295
- Issue date Feb 3, 1976
- Koppers Company, Inc.
- John Edward Cromwell
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...