Patents/Inventors

John Spangler

Knoxville, TNUS4 patents

4 Patents

USD10809152025
Pet Door
Radio Systems Corporation
0 cites
USD09867532023
Pet Boundary Transmitter
Radio Systems Corporation
0 cites
USD09865122023
Pet Boundary Collar Receiver
Radio Systems Corporation
0 cites
USD09854072023
Pet Boundary Control Panel
Radio Systems Corporation
0 cites