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The ornamental design for a box filter, as shown and described. |
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FIG. 1 is a side elevational view of a box filter, showing my new design, the opposite side elevational view being identical thereto;
FIG. 2 is a right end elevational view thereof;
FIG. 3 is a left end elevational view thereof;
FIG. 4 is a top plan view thereof, the bottom plan view being identical thereto;
FIG. 5 is a side elevational view of a second embodiment of FIG. 1, the opposite side elevational view being identical thereto;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a left side elevational view thereof; and,
FIG. 8 is a top plan view thereof, the bottom plan view being identical thereto.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jun 18 1993 | SPEARMAN, MICHAEL R | Porous Media Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 006606 | /0228 | |
| Jun 24 1993 | Porous Media Corporation | (assignment on the face of the patent) | / |
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