Granted Patent
Utility
US 4,432,708 · App. 06/277,108
Scroll type fluid displacement apparatus with pressure communicating passage between pockets
Inventors:
Masaharu Hiraga, Seiichi Sakamoto
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Jun 25, 1981
Inventors
Masaharu Hiraga
Seiichi Sakamoto
Assignee (at issue)
SANDEN CORPORATION
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.