Patent ID: 6951190

Claim:
A litter box comprising: a chamber having a bottom wall, spaced apart front and rear walls and first and second sidewalls for retaining a supply of litter; a first sensor for detecting an obstruction in said litter chamber, said first sensor having a transmitter and a receiver wherein said transmitter generates an output signal that is detected by said receiver, said transmitter being disposed on said first sidewall and said receiver being disposed on said second sidewall; said first sensor transmitter output signal generating a triangular shaped beam spread area extending from said first sidewall to said second side wall; a second sensor spaced apart from said first sensor for detecting an obstruction in said litter chamber, said second sensor having a transmitter and a receiver wherein said transmitter generates an output signal that is detected by said receiver, said transmitter is disposed on said second sidewall and said receiver is disposed on said first sidewall; said second sensor transmitter output signal generating a triangular shaped beam spread area extending from said second sidewall to said first sidewall; and said beam spread area generated by said first sensor transmitter being disposed adjacent to and non-overlapping with said beam spread area generated by said second sensor transmitter, such that said first and second sensors operate independently of each other for separately detecting obstructions in said beam spread areas.