Granted Patent
Utility
US 5,315,937 · App. 07/925,913
Waste material combustion ash ejection system
Inventor:
Robert M. Williams
Patented Case
View Patent ↗
Granted: May 31, 1994
Filed: Aug 7, 1992
Inventor
Robert M. Williams
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.