Granted Patent
Utility
US 4,826,375 · App. 07/085,822
Variable diameter screw fastener
Inventor:
Robert J. Holton
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Aug 17, 1987
Inventor
Robert J. Holton
Assignee (at issue)
Eaton 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.