Granted Patent
Utility
US 4,928,503 · App. 07/219,127
Scroll apparatus with pressure regulation
Inventor:
Delmar R. Riffe
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Jul 15, 1988
Inventor
Delmar R. Riffe
Assignee (at issue)
American Standard Inc.
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.