Granted Patent
Utility
US 5,217,547 · App. 07/701,845
Aluminum alloy fin material for heat exchanger
Inventors:
Kazunori Ishikawa, Mituo Hashiura, Yoshiharu Hasegawa
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: May 17, 1991
Inventors
Kazunori Ishikawa
Mituo Hashiura
Yoshiharu Hasegawa
Assignees (at issue)
Furukawa Aluminum Co., Ltd.
Nippondenso Co., Ltd.
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.