Granted Patent
Utility
US 4,804,041 · App. 06/862,721
Heat-exchanger of plate fin type
Inventors:
Kaoru Hasegawa, Shozo Uto, Suzushi Hashimoto
Patented Case
View Patent ↗
Granted: Feb 14, 1989
Filed: May 13, 1986
Inventors
Kaoru Hasegawa
Shozo Uto
Suzushi Hashimoto
Assignee (at issue)
Showa Aluminum Corp.
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.