Granted Patent
Utility
US 6,161,586 · App. 09/267,957
Tournament oil path constituting apparatus
Inventors:
Toichi Hirata, Genroku Sugiyama, Tsukasa Toyooka, Norio Onuma, Ikuo Inagaki, Masao Kashiwagi
Patented Case
View Patent ↗
Granted: Dec 19, 2000
Filed: Mar 12, 1999
Inventors
Toichi Hirata
Genroku Sugiyama
Tsukasa Toyooka
Norio Onuma
Ikuo Inagaki
Masao Kashiwagi
Assignee (at issue)
HITACHI CONSTRUCTION MACHINERY CO., LTD.
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.