Granted Patent
Utility
US 6,227,290 · App. 08/890,755
Laminated heat exchanger
Inventors:
Kunihiko Nishishita, Seiji Inoue, Kiyoshi Tanda, Hitoshi Sakata
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Jul 11, 1997
Inventors
Kunihiko Nishishita
Seiji Inoue
Kiyoshi Tanda
Hitoshi Sakata
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.