Granted Patent
Utility
US 5,025,721 · App. 07/452,411
Lock-in device and method
Inventor:
Kent Spiers
Patented Case
View Patent ↗
Granted: Jun 25, 1991
Filed: Dec 19, 1989
Inventor
Kent Spiers
Assignee (at issue)
Marathon Equipment Company
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.