John L. Hierbaum

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Murrysville, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Communications device for a protective helmet
- Patent number 7,110,743
- Issue date Sep 19, 2006
- Mine Safety Appliances Company
- Larry Depew
- A42 - HEADWEAR

Patents Applicationslast 30 patents

Information Patent Application
Communications device for a protective helmet
- Publication number 20040261158
- Publication date Dec 30, 2004
- Larry Depew
- A42 - HEADWEAR