Granted Patent
Utility
US 4,492,540 · App. 06/500,624
Variable-displacement vane compressor with one or more ferromagnetic vanes
Inventor:
Katsuichi Yamamoto
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Jun 3, 1983
Inventor
Katsuichi Yamamoto
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.