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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.
Kondo, Kenneth S., Woodson, James C., Mumford, Ron W.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Sep 15 1989 | WOODSON, JAMES C | CRITICAL INDUSTRIES, INC , A CORP OF DE | ASSIGNMENT OF ASSIGNORS INTEREST | 005436 | /0003 | |
Sep 15 1989 | MUMFORD, RON W | CRITICAL INDUSTRIES, INC , A CORP OF DE | ASSIGNMENT OF ASSIGNORS INTEREST | 005436 | /0003 | |
Sep 15 1989 | KONDO, KENNETH S | CRITICAL INDUSTRIES, INC , A CORP OF DE | ASSIGNMENT OF ASSIGNORS INTEREST | 005436 | /0003 | |
Sep 19 1989 | Critical Industries, Inc. | (assignment on the face of the patent) | / |
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