Granted Patent
Utility
US 6,056,509 · App. 08/809,339
Contra-rotating bearing device for contra-rotating propeller
Inventors:
Mikihiko Nakayama, Shinichi Ohtani, Kazuhide Ohta, Masayasu Matsuda, Keiichi Nitta, Satoshi Keirimbo, Satoshi Ashida, Hideki Shibuya
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Aug 10, 1998
Inventors
Mikihiko Nakayama
Shinichi Ohtani
Kazuhide Ohta
Masayasu Matsuda
Keiichi Nitta
Satoshi Keirimbo
Satoshi Ashida
Hideki Shibuya
Assignee (at issue)
KAWASAKI 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.