Helen F. Roberts

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Sudlersville, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Welding sealants for metals and method of use
- Patent number 4,661,675
- Issue date Apr 28, 1987
- W. R. Grace & Co.
- James L. Guthrie
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Weldable sealants for metal and method of use
- Patent number 4,559,373
- Issue date Dec 17, 1985
- W. R. Grace & Co.
- James L. Guthrie
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR