Granted Patent
Utility
US 4,502,853 · App. 06/580,100
Rotational speed sensor for vane compressors
Inventor:
Shinichi Ohi
Patented Case
View Patent ↗
Granted: Mar 5, 1985
Filed: Feb 14, 1984
Inventor
Shinichi Ohi
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.