Granted Patent
Utility
US 5,899,263 · App. 08/711,477
Heat exchanger
Inventor:
Toshinori Tokutake
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: Sep 10, 1996
Inventor
Toshinori Tokutake
Assignee (at issue)
Showa Aluminum Corp.
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.