Frank J. Petkewicz

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Chicago, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Electromagnetic device utilizing a pair of magnetically activated e...
- Patent number 4,322,708
- Issue date Mar 30, 1982
- GTE Automatic Electric Labs Inc.
- Kenneth H. Oehrig
- G01 - MEASURING TESTING
Information Patent Grant
Adjustable flux generator a magnetically activated electronic switch
- Patent number 4,322,709
- Issue date Mar 30, 1982
- GTE Automatic Electric Labs Inc.
- David L. Vonder
- G01 - MEASURING TESTING