Cat litter box

Claim 1

A sanitary litter box for use by cats comprising a series of three nesting containers, one of which has a screen bottom, with the other two containers formed with solid bottoms, together with an open bottom housing which fits over the containers, said housing having an opening in one or more sides adaptable for a cat to enter in which an external ramp is fastened to the external side of the housing below the said side opening, the height of said ramp corresponding to the height of the top nested container, in which the sides of each of the solid bottomed containers are inclined upwardly away from the center of the container, so that each of the two such containers may nest above or below the other container, with the screen bottomed container having internal inclined sides adaptable to permit the screen bottomed container to nest inside either of the solid bottomed containers, the screen bottomed container having additional externally inclined sides which project over and about the sides of the containers nested below it, said externally inclined sides joining at their upper edges the internally inclined sides of the screen bottomed container, with the internal inclined sides being joined to the bottom of the screen bottomed container and angled upwardly away from the center of the container, and the externally inclined sides angled downwardly away from the center of the container, such that the three containers may be nested together with the screen bottomed container uppermost, and sand initially added to the screen bottomed container so that it may serve as a litter box for a cat, with subsequent lifting of the uppermost screen bottomed container acting to remove solid debris from the sand, leaving the sand then in the uppermost solid-bottomed container of the two nested solid bottomed containers and permitting the screen bottomed container, after cleaning, to be installed into and above the empty lower container of the two nested containers, after removing the lower container from the nested configuration, thus permitting the sand in the remaining container to be poured into the screen bottomed container after it has been thus nested, and permitting the now empty container to be nested under the bottom of the other solid bottomed container.