Granted Patent
Utility
US 5,743,328 · App. 08/619,994
Duplex heat exchanger
Inventors:
Hironaka Sasaki, Hirohiko Watanabe, Tetsuya Tategami, Nobuaki Goh
Patented Case
View Patent ↗
Granted: Apr 28, 1998
Filed: Mar 21, 1996
Inventors
Hironaka Sasaki
Hirohiko Watanabe
Tetsuya Tategami
Nobuaki Goh
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.