Granted Patent
Utility
US 6,681,682 · App. 09/901,872
Hydraulic cylinder
Inventors:
Susumu Niwa, Susumu Kawai
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Jul 9, 2001
Inventors
Susumu Niwa
Susumu Kawai
Assignee (at issue)
Kayaba Kogyo 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.