US PATENT SUBCLASS 116 / 214
.~ By smoke or odor
Current as of: June, 1999
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DEFINITION
Classification: 116/214
By smoke or odor:
(under subclass 200) Devices wherein the indicator is a gas with particles suspended in it to make it visible or with a characteristic of a substance which makes it perceptible to the sense of smell.
SEE OR SEARCH THIS CLASS, SUBCLASS:
206, for chemically activated means which may cause a smoke or odor.
SEE OR SEARCH CLASS
246, Railway Switches and Signals,
169, for hot bearing detectors.
340, Communications: Electrical,
628, for an electrical smoke indicator.
