Granted Patent
Utility
US 5,390,897 · App. 08/161,000
Expansion valve for air conditioning system with proportional solenoid
Inventors:
Chester D. Campbell, Sandra L. Harper, Virender Jain, Richard L. Kenyon, Alan Matthies, Roger G. Riefler, Roy M. Yabuki, Ashok G. Zopey
Patented Case
View Patent ↗
Granted: Feb 21, 1995
Filed: Dec 3, 1993
Inventors
Chester D. Campbell
Sandra L. Harper
Virender Jain
Richard L. Kenyon
Alan Matthies
Roger G. Riefler
Roy M. Yabuki
Ashok G. Zopey
Assignee (at issue)
Parker-Hannifin 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.