Granted Patent
Utility
US 5,570,737 · App. 08/509,809
Heat exchanger
Inventor:
Toshinori Tokutake
Patented Case
View Patent ↗
Granted: Nov 5, 1996
Filed: Aug 1, 1995
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.