Granted Patent
Utility
US 4,675,996 · App. 06/850,485
Box knife
Inventor:
Thomas DuBuque
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Apr 11, 1986
Inventor
Thomas DuBuque
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.