Granted Patent
Utility
US 6,289,979 · App. 09/555,483
Heat exchanger
Inventor:
Souichi Kato
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Jun 1, 2000
Inventor
Souichi Kato
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.