Granted Patent
Utility
US 4,784,177 · App. 07/096,979
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: Nov 15, 1988
Filed: Sep 14, 1987
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.