Robert D. Hart

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Collinsville, CT, US

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Patents Grantslast 30 patents

Information Patent Grant
Electromagnetic flip-type visual indicator
- Patent number 4,694,599
- Issue date Sep 22, 1987
- Minelco, Inc.
- Robert D. Hart
- G08 - SIGNALLING
Information Patent Grant
Multi-channel fault monitor using quick-acting interfaces to operat...
- Patent number 4,652,868
- Issue date Mar 24, 1987
- Minelco, Inc.
- Robert D. Hart
- G08 - SIGNALLING
Information Patent Grant
Electromagnetic indicator
- Patent number 4,132,986
- Issue date Jan 2, 1979
- General Time Corporation
- Robert D. Hart
- G08 - SIGNALLING
Information Patent Grant
Damping means for indicators
- Patent number 4,115,769
- Issue date Sep 19, 1978
- General Time Corporation
- Robert D. Hart
- G08 - SIGNALLING