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Class Information
Number: 454/227
Name: Ventilation > Means combined with window > Including backdraft preventer
Description: Subject matter comprising a means which senses pressure or direction of air flow to or from a ventilated space and which acts to allow airflow under certain sensed conditions and to obstruct airflow under other sensed conditions.










Patents under this class:

Patent Number Title Of Patent Date Issued
6880622 Air guide device for cooling tower Apr. 19, 2005
5447470 Apparatus insuring distribution and automatic control of air supplies, in particular for ventilation of buildings Sep. 5, 1995
5083501 Ventilation window unit Jan. 28, 1992
4691487 Drain tube for windows Sep. 8, 1987
4377968 Fluid flow control means Mar. 29, 1983
4334461 Portable window dryer vent Jun. 15, 1982
4302262 Weather sealing strips for doors and windows Nov. 24, 1981
4214380 Dryer exhaust vent Jul. 29, 1980











 
 
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