Donald A. Clayman

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Ashtabula, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
System for recycling fines to hollow electrode
- Patent number 4,816,230
- Issue date Mar 28, 1989
- Elkem Metals Company
- John F. Bortnik
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
System for recycling fines to hollow electrode
- Patent number 4,491,568
- Issue date Jan 1, 1985
- Elkem Metals Company
- John F. Bortnik
- C01 - INORGANIC CHEMISTRY