Granted Patent
Utility
US 6,561,386 · App. 10/035,265
Ball check valve assembly
Inventor:
Matthew P. Martens
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Jan 3, 2002
Inventor
Matthew P. Martens
Assignee (at issue)
Juice Tyme
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.