Smoke and heat detection unit
United States Patent 3383670
US Patent References:
Selective smoke detector
- - 2033466

Smoke detector and signal
- - 2476958

Smoke detector and signal
- - 2537028

Electronic spectroscope
- - 2593616

Photoelectric smoke detector
- - 3185975


Inventors:
Roberts, Gordon A.
Publication Date:
05/14/1968
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Primary Class:
340/630
Other Classes:
250/565, 356/339, 340/593
International Classes:
G01N21/53; G08B17/107; G01N21/47; G08B17/103
US Patent References:
3222662Signalling apparatus incorporating a differential relay
3231748Smoke detector
2654242Measurement of water vapor in gases
2684008Method and apparatus for measuring the concentration of condensation nuclei
Foreign References:
GB625731A