Granted Patent
Utility
US 4,822,428 · App. 07/043,947
Apparatus for cleaning air ports of a chemical recovery furnace
Inventor:
Byron L. Goodspeed
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Apr 29, 1987
Inventor
Byron L. Goodspeed
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.