Granted Patent
Utility
US 4,470,516 · App. 06/531,907
High pressure feedwater heater closure assembly
Inventor:
John L. Tsou
Patented Case
View Patent ↗
Granted: Sep 11, 1984
Filed: Sep 12, 1983
Inventor
John L. Tsou
Assignee (at issue)
McQuay, 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.