Granted Patent
Utility
US 5,511,613 · App. 08/353,939
Elongated heat exchanger tubes having internal stiffening structure
Inventors:
Walter R. Mohn, Douglas D. Zeigler
Patented Case
View Patent ↗
Granted: Apr 30, 1996
Filed: Dec 12, 1994
Inventors
Walter R. Mohn
Douglas D. Zeigler
Assignee (at issue)
Hudson Products Corporation
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.