Granted Patent
Utility
US 5,725,007 · App. 08/499,412
Valve mechanism and method for making same
Inventor:
William Lewis Middleton Stubbs
Patented Case
View Patent ↗
Granted: Mar 10, 1998
Filed: Jul 7, 1995
Inventor
William Lewis Middleton Stubbs
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.