Robert F. Johnson

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Spring Lake, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Permanent mold for casting reactive melt
- Patent number 5,443,111
- Issue date Aug 22, 1995
- Howmet Corporation
- Gregory N. Colvin
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Permanent mold casting of reactive melt
- Patent number 5,287,910
- Issue date Feb 22, 1994
- Howmet Corporation
- Gregory N. Colvin
- B22 - CASTING POWDER METALLURGY