Granted Patent
Utility
US 5,901,669 · App. 08/417,167
Variable pressure once-through steam generator upper furnace having non-split flow circuitry
Inventor:
Calvin E. Phelps, Sr.
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Apr 5, 1995
Inventor
Calvin E. Phelps, Sr.
Assignee (at issue)
The Babcock & Wilcox 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.