Granted Patent
Utility
US 4,442,559 · App. 06/279,789
Utility knife
Inventor:
Walter W. Collins
Patented Case
View Patent ↗
Granted: Apr 17, 1984
Filed: Jul 2, 1981
Inventor
Walter W. Collins
Assignee (at issue)
Jenkins Metal Corporation
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.