Granted Patent
Utility
US 4,867,658 · App. 06/447,528
Rotary vane compressor having pressure-biased vanes
Inventors:
Terumitsu Sugita, Koji Urushibara
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Dec 7, 1982
Inventors
Terumitsu Sugita
Koji Urushibara
Assignee (at issue)
Seiko Seiki Kabushiki Kaisha
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.