Pet door for a screen

Claim 1

In combination with a door screen located in a given plane, said door screen having an access opening, a pet door comprising: a fixed frame forming an enclosed area, said fixed frame being attached only to said screen, said fixed frame comprising a first member and a second member which interfit together securely binding said screen therebetween, said fixed frame being located directly adjacent said access opening with said enclosed area being within said access opening, said first member including an elongated groove formed by a pair of elongated upstanding side wall members, said second member including an elongated protuberance, said elongated protuberance to be located within said elongated groove in a mating male and female arrangement with said upstanding side wall members exerting a continuous bias toward said elongated protuberance and said screen to be located between said side wall members and said elongated protuberance; and a door mounted on said fixed frame and located within said enclosed area, said door being pivotable on said fixed frame on a pivot axis, said pivot axis being located substantially within said given plane, said door to be movable from a closed position located within said given plane to an open position permitting movement of a domesticated animal through said access opening.