Granted Patent
Utility
US 4,513,786 · App. 06/484,742
Mechanical tube plub
Inventors:
Jan H. Sodergren, James W. Hales
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Apr 14, 1983
Inventors
Jan H. Sodergren
James W. Hales
Assignee (at issue)
Combustion Engineering, Inc.
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.