Granted Patent
Utility
US 6,289,981 · App. 09/419,519
Multi-bored flat tube for use in a heat exchanger and heat exchanger including said tubes
Inventors:
Kazumi Tokizaki, Yutaka Higo, Nobuaki Go, Shigeharu Ichiyanagi
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Oct 18, 1999
Inventors
Kazumi Tokizaki
Yutaka Higo
Nobuaki Go
Shigeharu Ichiyanagi
Assignee (at issue)
Showa Denko K.K.
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.