FIG. 1 is an exploded perspective view of a pipette tip tray assembly including a tray lid, pipette tip rack, and tray base;

FIG. 2 is a closed assembled perspective view of the pipette tip tray assembly;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front view, thereof;

FIG. 6 is a back view thereof;

FIG. 7 is a left view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a perspective view of the pipette tip rack portion installed in the tray base portion;

FIG. 10 is a top view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a back view thereof;

FIG. 14 is a left side view thereof;

FIG. 15 is a bottom view thereof;

FIG. 16 is a perspective upside down view of the lid portion;

FIG. 17 is a top view thereof;

FIG. 18 is a front view thereof;

FIG. 19 is a left side view thereof;

FIG. 20 is a right side view thereof;

FIG. 21 is a back view thereof;

FIG. 22 is a bottom or inside view thereof;

FIG. 23 is a perspective view of a pipette tip rack portion;

FIG. 24 is a top view thereof;

FIG. 25 is a front side view thereof;

FIG. 26 is a right side view thereof;

FIG. 27 is a back view thereof;

FIG. 28 is a left side view thereof;

FIG. 29 is a bottom view thereof;

FIG. 30 is a perspective bottom view thereof;

FIG. 31 is a perspective view of the tray base portion;

FIG. 32 is a top view thereof;

FIG. 33 is a front view thereof;

FIG. 34 is a right side view thereof;

FIG. 35 is a back view thereof;

FIG. 36 is a left side view, thereof;

FIG. 37 is a bottom view thereof;

FIG. 38 is an enlarged partial perspective view of the lid and pipette tip rack clip receptacles shown in FIG. 32 at “A”;

FIG. 39 is a perspective cross-sectional view taken along line 39—39;

FIG. 40 is a greatly enlarged partial perspective view of the lid clip engaged in the base tray in the closed position shown in FIG. 39 at “B”;

FIG. 41 is a perspective cross-sectional view taken along line 41—41;

FIG. 42 is an enlarged partial perspective view of the pipette tip rack clip installed in the base tray shown in FIG. 41 at “C”;

FIG. 43 is a top view of the pipette tip tray assembly in the open position;

FIG. 44 is a cross-sectional view taken along line 44—44;

FIG. 45 is an enlarged partial view of the lid clip engaged in the base tray in the open position shown in FIG. 44 at “D”;

FIG. 46 is a top view of the pipette tip tray assembly with the pipette tip rack portion installed in the base tray;

FIG. 47 is a cross-sectional view taken along line 47—47; and,

FIG. 48 is a cross-sectional view taken along line 48—48.

Broken lines are included for the purpose of illustrating portions of the pipette tip tray assembly that forms no part of the claimed design.