Granted Patent
Utility
US 5,603,159 · App. 08/534,559
Method of producing heat exchangers
Inventors:
Toshio Tsubakida, Yoshihisa Eto, Takashi Sugita, Shoji Kuwabara
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Sep 27, 1995
Inventors
Toshio Tsubakida
Yoshihisa Eto
Takashi Sugita
Shoji Kuwabara
Assignee (at issue)
Zexel GmbH
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.