Car seat base

FIG. 1 is a perspective view of a car seat base showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right 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 the design in a state of use with broken line environment;

FIG. 9 is another perspective view of the design in a state of use with broken line environment;

FIG. 10 is still another perspective view of the design in a state of use with broken line environment; and,

FIG. 11 is a perspective view of the design with broken line environment.

The dashed broken lines depict portions of a car seat base in which the design is embodied that form no part of the claimed design, and illustrate environment structures that form no part of the claimed design. The dot-dash broken lines are for defining the bounds of the claimed design only and form no part of the claimed design.