Granted Patent
Utility
US 5,158,135 · App. 07/863,425
Laminate type heat exchanger
Inventors:
Yoshikiyo Nagasaka, Ichiro Noguchi
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Apr 3, 1992
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.