Granted Patent
Utility
US 4,621,685 · App. 06/664,457
Heat exchanger comprising condensed moisture drainage means
Inventor:
Kazuo Nozawa
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Oct 24, 1984
Inventor
Kazuo Nozawa
Assignee (at issue)
Diesel Kiki Co., Ltd.
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.