Granted Patent
Utility
US 6,378,461 · App. 09/552,359
Self-cleaning litter box
Inventors:
Arnold Thaler, Philip Y. H. Cheung
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Apr 19, 2000
Inventors
Arnold Thaler
Philip Y. H. Cheung
Assignee (at issue)
HP Intellectual Corp.
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.