Panel filter construction
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FIG. 1 is a perspective view of a panel filter construction;
FIG. 2 is an enlarged right side view of FIG. 1, the left side being identical thereto;
FIG. 3 is an enlarged top plan view of FIG. 1;
FIG. 4 is an enlarged bottom plan view of FIG. 1;
FIG. 5 is an enlarged front side view of FIG. 1, the back side view being identical thereto;
FIG. 6 is a perspective view of a second embodiment of a panel filter construction; separate layers of filter media in the construction being indicated to contrast in appearance;
FIG. 7 is an enlarged right side view of FIG. 6, the left side being identical thereto;
FIG. 8 is an enlarged top plan view of FIG. 6;
FIG. 9 is an enlarged bottom plan view of FIG. 6;
FIG. 10 is an enlarged front side view of FIG. 6, the back side view being identical thereto;
FIG. 11 is a perspective view of another embodiment of a panel filter construction; an outermost layer of media being lined to indicate blue color, and a next inner layer being marked to indicate color contrast;
FIG. 12 is an enlarged right side view of FIG. 11, the left side being identical thereto;
FIG. 13 is an enlarged top plan view of FIG. 11;
FIG. 14 is an enlarged bottom plan view of FIG. 11; and,
FIG. 15 is an enlarged front side view of FIG. 11, the back side view being identical thereto.
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| 3766629 | October 1973 | Lechtenberg |
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| 4069026 | January 17, 1978 | Simm et al. |
| 4086070 | April 25, 1978 | Argo et al. |
| 5368622 | November 29, 1994 | McMillon |
| 5423903 | June 13, 1995 | Schmitz et al. |
| 0 212 082 | March 1987 | EPX |
| 0 347 188 | December 1989 | EPX |
- "Nonwovens in Filtration/Separation", paper presented by Clarke A. Rodman and Edward C. Homonoff, Allied Aftermarket Division, Allied Signal Corporation, Nonwoven Fabrics Forum, Jun. 21-23, 1988, Clemson University, Clemson, S.C. 1989 SAE Handbook, vol. 3, Engines, Fuels, Lubricants, Emissions & Noise, pp. 24.45-24.47.
Type: Grant
Filed: Jul 11, 1996
Date of Patent: Dec 8, 1998
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Larry R. Nepsund (Savage, MN), Kathleen A. Abrahamson (Prior Lake, MN), Thomas A. Boeckermann (Lakeville, MN), James K. Elfstrand (Mounds View, MN)
Primary Examiner: Lisa Lichtenstein
Law Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt, P.A.
Application Number: 0/56,896
