Granted Patent
Utility
US 4,682,579 · App. 06/831,981
Condensate overflow control for furnace
Inventor:
Davis L. Bigham
Patented Case
View Patent ↗
Granted: Jul 28, 1987
Filed: Feb 21, 1986
Inventor
Davis L. Bigham
Assignee (at issue)
Heil-Quaker 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.