Granted Patent
Utility
US 4,538,674 · App. 06/421,551
Heat exchanger having tubular members concentric with fluid carrying tubes to prevent mixing of the heat exchange fluids and method of construction thereof
Inventor:
Donald C. Schluderberg
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Sep 22, 1982
Inventor
Donald C. Schluderberg
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.