FIG. 1 is an enlarged perspective view of a portion of a heat exchanger fin showing a pattern of raised slots in the fin according to the invention disposed between a pair of collared holes;
FIG. 2 is a top view of the portion of the heat exchanger fin of FIG. 1;
FIG. 3 is a bottom view of the portion of the heat exchanger fin of FIG. 1;
FIG. 4 is a left side view of the portion of the heat exchanger fin of FIG. 1;
FIG. 5 is a right side view of the portion of the heat exchanger fin of FIG. 1;
FIG. 6 is a front view of the portion heat exchanger fin of FIG. 1;
FIG. 7 is a cross section view of the portion of the heat exchanger fin of FIG. 1 taken along lines 7—7 of FIG. 2;
FIG. 8 is a perspective view of a section of a heat exchanger fin according to a first embodiment of the invention characterized by having a single longitudinal row of collared holes separated by patterns of raised slots according to the invention as detailed in FIGS. 1-7;
FIG. 9 is a top view of a portion of the section of the heat exchanger fin of FIG. 8;
FIG. 10 is a perspective view of a section of a heat exchanger fin according to a second embodiment of the invention characterized by two longitudinal rows of collared holes separated by patterns of raised slots according to the invention as detailed in FIGS. 1-7, wherein the first longitudinal row of collared holes is longitudinally offset from the second longitudinal row of collared holes;
FIG. 11 is a top view of the section of the heat exchanger fin of FIG. 10;
FIG. 12 is a top view of a section of a heat exchanger fin according to a third embodiment of the invention characterized by three or more longitudinal rows of collared holes separated by patterns of raised slots according to the invention as detailed in FIGS. 1-7, wherein each longitudinal row of collared holes is longitudinally offset from an adjacent longitudinal row of collared holes; and,
FIG. 13 is a top view of a section of heat exchanger fin according to a fourth embodiment of the invention characterized by two or more longitudinal rows of collared holes separated by patterns of raised slots according to the invention as detailed in FIGS. 1-7, wherein each longitudinal row of collared holes is longitudinally aligned with an adjacent longitudinal row of collared holes.
In FIGS. 1-13, the structure shown in broken lines is not part of the design sought to be patented. FIGS. 1-7 have been drawn in a larger scale than FIGS. 8-11, which in turn have been drawn in a larger scale than FIGS. 12 and 13.
