Granted Patent
Utility
US 4,498,852 · App. 06/356,497
Scroll type fluid displacement apparatus with improved end plate fluid passage means
Inventor:
Masaharu Hiraga
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: Mar 9, 1982
Inventor
Masaharu Hiraga
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.