Granted Patent
Utility
US 4,540,109 · App. 06/553,947
Process for severing a tube sheet
Inventor:
Charles J. Runkle
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Nov 21, 1983
Inventor
Charles J. Runkle
Assignee (at issue)
Monsanto Company
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.