Granted Patent
Utility
US 5,123,483 · App. 07/771,755
Heat exchanger
Inventors:
Toshinori Tokutake, Mitsuru Nobusue, Tatsuya Hanafusa
Patented Case
View Patent ↗
Granted: Jun 23, 1992
Filed: Oct 4, 1991
Inventors
Toshinori Tokutake
Mitsuru Nobusue
Tatsuya Hanafusa
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.