Granted Patent
Utility
US 5,417,255 · App. 08/122,388
Gas flushing apparatus and method
Inventors:
James J. Sanfilippo, John E. Sanfilippo
Patented Case
View Patent ↗
Granted: May 23, 1995
Filed: Sep 16, 1993
Inventors
James J. Sanfilippo
John E. Sanfilippo
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.