Granted Patent
Utility
US 6,474,458 · App. 09/864,214
Viscous fluid coupling
Inventors:
Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
Patented Case
View Patent ↗
Granted: Nov 5, 2002
Filed: May 25, 2001
Inventors
Hirofumi Katoh
Shinichi Kawada
Kenzi Ohhara
Yasuo Fujita
Assignee (at issue)
Unisia Jecs Corporation
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.