Granted Patent
Utility
US 4,748,743 · App. 07/002,561
Utility knife with improved blade locking feature
Inventors:
Lloyd E. Anderson, Martin L. Anderson
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Jan 12, 1987
Inventors
Lloyd E. Anderson
Martin L. Anderson
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.