Granted Patent
Utility
US 6,401,661 · App. 09/633,489
Self-cleaning pet litter box assembly
Inventor:
Richard H. Emery
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Aug 7, 2000
Inventor
Richard H. Emery
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.