Granted Patent
Utility
US 5,402,821 · App. 08/292,706
In-line incrementally manually adjustable rotary expansion valve
Inventor:
Michael Harstad
Patented Case
View Patent ↗
Granted: Apr 4, 1995
Filed: Aug 18, 1994
Inventor
Michael Harstad
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.