Granted Patent
Utility
US 5,014,729 · App. 07/388,953
Expansion device for a refrigeration system, piston therefor and methods of making the same
Inventors:
Roger P. Sepso, John M. Halmose
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Aug 2, 1989
Inventors
Roger P. Sepso
John M. Halmose
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.