Granted Patent
Utility
US 4,813,376 · App. 07/084,392
Cat litter tray
Inventors:
George Kaufman, Norman Usen
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Aug 11, 1987
Inventors
George Kaufman
Norman Usen
Assignee (at issue)
Church & Dwight Co., Inc.
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.