Granted Patent
Utility
US 6,053,243 · App. 08/931,713
Header pipe for heat exchanger and manufacturing apparatus and manufacturing method thereof
Inventors:
Soichi Kato, Takashi Sugita, Hitoshi Makabe
Patented Case
View Patent ↗
Granted: Apr 25, 2000
Filed: Sep 16, 1997
Inventors
Soichi Kato
Takashi Sugita
Hitoshi Makabe
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.