Granted Patent
Utility
US 5,183,103 · App. 07/782,984
Heat exchanger
Inventor:
Toshinori Tokutake
Patented Case
View Patent ↗
Granted: Feb 2, 1993
Filed: Oct 28, 1991
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.