Granted Patent
Utility
US 4,800,954 · App. 07/130,298
Laminated heat exchanger
Inventors:
Ichiro Noguchi, Yoshikiyo Nagasaka, Isamu Kurosawa
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Dec 8, 1987
Inventors
Ichiro Noguchi
Yoshikiyo Nagasaka
Isamu Kurosawa
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.