Granted Patent
Utility
US 4,286,548 · App. 06/095,918
Gas recirculation apparatus with integral ash hoppers
Inventor:
Leslie O. Brash
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Nov 19, 1979
Inventor
Leslie O. Brash
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.