Granted Patent
Utility
US 6,467,732 · App. 09/790,559
Rotary blade of helicopter
Inventors:
Takanori Tsukahara, Masahiro Obukata
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Feb 23, 2001
Inventors
Takanori Tsukahara
Masahiro Obukata
Assignee (at issue)
Fuji Jukogyo Kabushiki Kaisha
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.