Granted Patent
Utility
US 4,031,819 · App. 05/647,059
Apparatus for collecting and conveying of fumes from a furnace
Inventor:
Grant D. Applewhite
Patented Case
View Patent ↗
Granted: Jun 28, 1977
Filed: Jan 7, 1976
Inventor
Grant D. Applewhite
Assignee (at issue)
AMERICAN AIR FILTER COMPANY, 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.