FIG. 1 is a top, front, right perspective view of a first embodiment of a door ladder showing our new design, where a non-transparent material, as indicated by the dot surface shading pattern, is different from a remainder of the door ladder;
FIG. 2 is a front elevation view of the door ladder of FIG. 1;
FIG. 3 is a left elevation view of the door ladder of FIG. 1;
FIG. 4 is a right elevation view of the door ladder of FIG. 1;
FIG. 5 is a top plan view of the door ladder of FIG. 1;
FIG. 6 is a bottom elevation view of the door ladder of FIG. 1;
FIG. 7 is a cross-sectional view of the door ladder of FIG. 1 as indicated in FIG. 2;
FIG. 8 is a scaled up front elevation view of a portion of the door ladder of FIG. 1 as indicated in FIG. 2;
FIG. 9 is a scaled up cross-sectional view of the door ladder of FIG. 1 as indicated in FIG. 7;
FIG. 10 is a top, front, right perspective view of a second embodiment of a door ladder showing our new design, where a metallic material, as indicated by surface shading, and a white material, as indicated by stippling, are used;
FIG. 11 is a front elevation view of the door ladder of FIG. 10;
FIG. 12 is a left elevation view of the door ladder of FIG. 10;
FIG. 13 is a right elevation view of the door ladder of FIG. 10;
FIG. 14 is a top plan view of the door ladder of FIG. 10;
FIG. 15 is a bottom elevation view of the door ladder of FIG. 10;
FIG. 16 is a cross-sectional view of the door ladder of FIG. 10 as indicated in FIG. 11;
FIG. 17 is a scaled up front elevation view of a portion of the door ladder of FIG. 10 as indicated in FIG. 11; and,
FIG. 18 is a scaled up cross-sectional view of the door ladder of FIG. 10 as indicated in FIG. 16.
The broken lines in FIGS. 1-18 are included for the purpose of illustrating portions of the door ladder that form no part of the claimed design. For example, broken lines formed by equal length dashes show unclaimed portions of the design and boundaries of enlargements. Broken lines formed of unequal length dashes (e.g., dash-dot-dash) show boundaries of the claimed design. The back of the door ladder is flat and unornamented for both provided embodiments.