Granted Patent
Utility
US 6,487,778 · App. 09/809,676
Utility knife with pressure reducing slot
Inventors:
Donald Gringer, Yuan Fang Cheng
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Mar 15, 2001
Inventors
Donald Gringer
Yuan Fang Cheng
Assignee (at issue)
ALLWAY TOOLS, 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.