Granted Patent
Utility
US 5,203,402 · App. 07/836,127
Heat exchanger
Inventors:
Kunihiko Nishishita, Amane Watanabe, Isamu Kurosawa, Yokichi Sato
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Feb 14, 1992
Inventors
Kunihiko Nishishita
Amane Watanabe
Isamu Kurosawa
Yokichi Sato
Assignees (at issue)
Zexel GmbH
Nihon Parkerizing 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.