Granted Patent
Utility
US 4,415,321 · App. 06/244,804
Vane compressor having a lightweight rotor
Inventor:
Michio Okazaki
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Mar 17, 1981
Inventor
Michio Okazaki
Assignee (at issue)
Diesel Kiki 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.