Granted Patent
Utility
US 4,440,535 · App. 06/263,526
Sheet metal fastener
Inventor:
Donald N. Oehlke
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: May 14, 1981
Inventor
Donald N. Oehlke
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.