Granted Patent
Utility
US 4,516,920 · App. 06/596,001
Variable capacity vane compressor capable of controlling back pressure acting upon vanes
Inventor:
Tsunenori Shibuya
Patented Case
View Patent ↗
Granted: May 14, 1985
Filed: Mar 30, 1984
Inventor
Tsunenori Shibuya
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.