Granted Patent
Utility
US 5,947,365 · App. 08/882,338
Process for producing flat heat exchange tubes
Inventors:
Daishi Tanaka, Masakazu Furuta, Kazuyuki Takahashi, Yasuhiro Osame
Patented Case
View Patent ↗
Granted: Sep 7, 1999
Filed: Jun 25, 1997
Inventors
Daishi Tanaka
Masakazu Furuta
Kazuyuki Takahashi
Yasuhiro Osame
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.