Granted Patent
Utility
US 4,378,321 · App. 06/352,674
Tamper proof sealing plug
Inventor:
Robert J. Miller
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Feb 26, 1982
Inventor
Robert J. Miller
Assignee (at issue)
Colt Industries Operating 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.