Granted Patent
Utility
US 4,989,482 · App. 07/437,587
Method and apparatus for punching a hole in sheet material
Inventor:
Murray R. Mason
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Nov 17, 1989
Inventor
Murray R. Mason
Assignee (at issue)
TI Corporate Services Limited
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.