Box filter
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Description
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.
Referenced Cited
U.S. Patent Documents
D234721 | April 1975 | Rosenberg |
D235035 | April 1975 | Rosenberg |
D238456 | January 1976 | Mouwen |
D247252 | February 14, 1978 | Rosenberg |
D253721 | December 18, 1979 | Gibeck |
D260175 | August 11, 1981 | Hein et al. |
D267117 | November 30, 1982 | Rosenberg |
D333348 | February 16, 1993 | Yokomachi |
3765536 | October 1973 | Rosenberg |
3765537 | October 1973 | Rosenberg |
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5133879 | July 28, 1992 | Tiittanen |
Patent History
Patent number: D357737
Type: Grant
Filed: Jun 24, 1993
Date of Patent: Apr 25, 1995
Assignee: Porous Media Corporation (St. Paul, MN)
Inventor: Michael R. Spearman (St. Paul, MN)
Primary Examiner: Stella Reid
Law Firm: Marshall & Melhorn
Application Number: 0/10,022
Type: Grant
Filed: Jun 24, 1993
Date of Patent: Apr 25, 1995
Assignee: Porous Media Corporation (St. Paul, MN)
Inventor: Michael R. Spearman (St. Paul, MN)
Primary Examiner: Stella Reid
Law Firm: Marshall & Melhorn
Application Number: 0/10,022
Classifications