Regenerative Filter

FIG. 1 is a perspective view of a regenerative filter; FIG. 2 is a front elevational view thereof; FIG. 3 is a rear elevational view thereof; FIG. 4 is a right side elevational view thereof; FIG. 5 is a left side elevational view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; FIG. 8 is a perspective view of a second embodiment thereof; FIG. 9 is a front elevational view of a second embodiment thereof; FIG. 10 is a rear elevational view of a second embodiment thereof; FIG. 11 is a right side elevational view of a second embodiment thereof; FIG. 12 is a left side elevational view of a second embodiment thereof; FIG. 13 is a top plan view of a second embodiment thereof; FIG. 14 is a bottom plan view of a second embodiment thereof; FIG. 15 is a perspective view of a third embodiment thereof; FIG. 16 is a front elevational view of a third embodiment thereof; FIG. 17 is a rear elevational view of a third embodiment thereof; FIG. 18 is a right side elevational view of a third embodiment thereof; FIG. 19 is a left side elevational view of a third embodiment thereof; FIG. 20 is a top plan view of a third embodiment thereof; FIG. 21 is a bottom plan view of a third embodiment thereof; FIG. 22 is a perspective view of a fourth embodiment thereof; FIG. 23 is a front elevational view of a fourth embodiment thereof; FIG. 24 is a rear elevational view of a fourth embodiment thereof; FIG. 25 is a right side elevational view of a fourth embodiment thereof; FIG. 26 is a left side elevational view of a fourth embodiment thereof; FIG. 27 is a top plan view of a fourth embodiment thereof; FIG. 28 is a bottom plan view of a fourth embodiment thereof; FIG. 29 is a perspective view of a fifth embodiment thereof; FIG. 30 is a front elevational view of a fifth embodiment thereof; FIG. 31 is a rear elevational view of a fifth embodiment thereof; FIG. 32 is a right side elevational view of a fifth embodiment thereof; FIG. 33 is a left side elevational view of a fifth embodiment thereof; FIG. 34 is a top plan view of a fifth embodiment thereof; FIG. 35 is a bottom plan view of a fifth embodiment thereof; FIG. 36 is a perspective view of a sixth embodiment thereof; FIG. 37 is a front elevational view of a sixth embodiment thereof; FIG. 38 is a rear elevational view of a sixth embodiment thereof; FIG. 39 is a right side elevational view of a sixth embodiment thereof; FIG. 40 is a left side elevational view of a sixth embodiment thereof; FIG. 41 is a top plan view of a sixth embodiment thereof; and, FIG. 42 is a bottom plan view of a sixth embodiment thereof. The broken lines shown in the drawing views are included for the purpose of showing environmental structure that forms no part of the claimed design.