Granted Patent
Utility
US 6,170,684 · App. 08/606,596
Flask vent and method of making same
Inventors:
Monty E. Vincent, John R. Costello
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Feb 26, 1996
Inventors
Monty E. Vincent
John R. Costello
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.