Robert M. Armstrong

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Clifton Heights, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Combination head-protective helmet & communications system
- Patent number 5,404,577
- Issue date Apr 4, 1995
- Cairns & Brother Inc.
- Lawrence H. Zuckerman
- A42 - HEADWEAR
Information Patent Grant
Positive pressure breathing assembly and demand regulator therefor
- Patent number 5,271,390
- Issue date Dec 21, 1993
- Cairns & Brother Inc.
- Robert E. Gray
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Assembly for monitoring helmet thermal conditions
- Patent number 5,200,736
- Issue date Apr 6, 1993
- Cairns & Brother Inc.
- Christopher E. Coombs
- A42 - HEADWEAR
Information Patent Grant
Pressure monitoring device for self-contained breathing apparatus
- Patent number 5,097,826
- Issue date Mar 24, 1992
- Cairns & Brother, Inc.
- Robert E. Gray
- B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
Information Patent Grant
Positive pressure breathing assembly and demand regulator therefor
- Patent number 5,000,174
- Issue date Mar 19, 1991
- Cairns & Brother Inc.
- Robert E. Gray
- B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT