Granted Patent
Utility
US 4,544,332 · App. 06/520,137
Double acting type compressor
Inventor:
Tsunenori Shibuya
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: Aug 4, 1983
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.