Negative pressure air filtration housing
Description
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.
Referenced Cited
Patent History
Patent number: D316447
Type: Grant
Filed: Sep 19, 1989
Date of Patent: Apr 23, 1991
Assignee: Critical Industries, Inc. (Houston, TX)
Inventors: James C. Woodson (Houston, TX), Ron W. Mumford (Houston, TX), Kenneth S. Kondo (Houston, TX)
Primary Examiner: James M. Gandy
Assistant Examiner: Lisa Lichtenstein
Law Firm: Gunn, Lee & Miller
Application Number: 7/408,800
Type: Grant
Filed: Sep 19, 1989
Date of Patent: Apr 23, 1991
Assignee: Critical Industries, Inc. (Houston, TX)
Inventors: James C. Woodson (Houston, TX), Ron W. Mumford (Houston, TX), Kenneth S. Kondo (Houston, TX)
Primary Examiner: James M. Gandy
Assistant Examiner: Lisa Lichtenstein
Law Firm: Gunn, Lee & Miller
Application Number: 7/408,800
Classifications
Current U.S. Class:
Filter (D23/365)