Granted Patent
Utility
US 5,176,206 · App. 07/696,687
Laminate type heat exchanger
Inventors:
Yoshikiyo Nagasaka, Ichiro Noguchi
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Apr 23, 1991
Inventors
Yoshikiyo Nagasaka
Ichiro Noguchi
Assignee (at issue)
Zexel GmbH
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.