Granted Patent
Utility
US 4,638,148 · App. 06/709,889
Control system and control device for controlling a heating unit and method of making the same
Inventor:
Harvey J. Shopsky
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Mar 8, 1985
Inventor
Harvey J. Shopsky
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.