Granted Patent
Utility
US 4,564,748 · App. 06/437,562
Variable temperature heating control system for inhalation therapy apparatus
Inventor:
John E. Gupton
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Oct 29, 1982
Inventor
John E. Gupton
Assignee (at issue)
Respiratory Care, Inc.
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.