Granted Patent
Utility
US 6,832,438 · App. 09/874,665
Utility knife with quick release housing
Inventors:
Donald Gringer, Yuan Fang Cheng
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Jun 5, 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.