Granted Patent
Utility
US 4,644,138 · App. 06/488,371
Temperature control system with simplified controller and power supply
Inventor:
Paul L. Walsh
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Apr 25, 1983
Inventor
Paul L. Walsh
Assignee (at issue)
Corning Glass Works
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.