Granted Patent
Utility
US 4,138,607 · App. 05/809,845
Dual priority temperature control
Inventor:
Rudolph H. Engelmann
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Jun 24, 1977
Inventor
Rudolph H. Engelmann
Assignee (at issue)
Pako 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.