Granted Patent
Utility
US 4,765,374 · App. 07/110,806
Multi-seal mechanical tube plug
Inventors:
Leonard F. Ermold, Robert F. Keating, Lawrence A. Nelson
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: Oct 21, 1987
Inventors
Leonard F. Ermold
Robert F. Keating
Lawrence A. Nelson
Assignee (at issue)
Westinghouse Electric Company LLC
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.