Granted Patent
Utility
US 6,799,630 · App. 09/486,230
Tube for heat exchangers and method of manufacturing the same
Inventors:
Soichi Kato, Muneo Sakurada, Shin Kurihara, Sadao Haiya, Takashi Sugita, Shoji Akiyama, Takahumi Umehara
Patented Case
View Patent ↗
Granted: Oct 5, 2004
Filed: Feb 24, 2000
Inventors
Soichi Kato
Muneo Sakurada
Shin Kurihara
Sadao Haiya
Takashi Sugita
Shoji Akiyama
Takahumi Umehara
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.