US PATENT SUBCLASS 15 / 404-- .~.~ With pulsating air flow

US PATENT SUBCLASS 15 / 404
.~.~ With pulsating air flow

Current as of: June, 1999
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15 /	HD	BRUSHING, SCRUBBING, AND GENERAL CLEANING

3	DF	MACHINES {11}
300.1	DF	.~ With air blast or suction {26}
404		.~.~ With pulsating air flow

DEFINITION

Classification: 15/404

(under subclass 300) Cleaning apparatus having provisions for pulsating the air flow, the effect generally being to agitate the work such as the nap of a pile rug or the like.

(1) Note. This subclass includes patents for nozzles having a plurality of air passages with means to apply the air draft successively to the passages, the effect as to any one passage being a pulsating or intermittent air flow even though there is a more or less constant air flow through the nozzle as a whole.