Granted Patent
Utility
US 4,480,973 · App. 06/395,867
Vane compressor provided with endless camming surface minimizing torque fluctuations
Inventor:
Yutaka Ishizuka
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Jul 7, 1982
Inventor
Yutaka Ishizuka
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.