Robert E. Gray

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Pittsburgh, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Mouthpiece valve for escape breathing apparatus
- Patent number 4,090,511
- Issue date May 23, 1978
- Mine Safety Appliances Company
- Robert Elder Gray
- B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
Information Patent Grant
Respirator pressure-demand exhalation valve
- Patent number 4,007,758
- Issue date Feb 15, 1977
- Mine Safety Appliances Company
- Robert E. Gray
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...