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Publication numberUSD316447 S
Publication typeGrant
Application numberUS 07/408,800
Publication dateApr 23, 1991
Filing dateSep 19, 1989
Publication number07408800, 408800, US D316447 S, US D316447S, US-S-D316447, USD316447 S, USD316447S
InventorsJames C. Woodson, Ron W. Mumford, Kenneth S. Kondo
Original AssigneeCritical Industries, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Negative pressure air filtration housing
US D316447 S
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  1. The ornamental design for a negative pressure air filtration housing, as shown.

FIG. 1 is a perspective view of a negative pressure air filtration housing showing our new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front end elevation view thereof; and

FIG. 7 is a rear end elevational view thereof.

U.S. ClassificationD23/365