Donald F. Steele

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Cohasset, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Secondary light testing in optical smoke detectors
- Patent number 4,166,698
- Issue date Sep 4, 1979
- American District Telegraph Company
- Donald F. Steele
- G08 - SIGNALLING
Information Patent Grant
Optical smoke detector inlet screen
- Patent number 4,124,298
- Issue date Nov 7, 1978
- Electro Signal Lab, Inc.
- Donald F. Steele
- G08 - SIGNALLING