Granted Patent
Utility
US 6,029,685 · App. 09/231,119
Cage assembly for ball check valves
Inventor:
Don V. Carruth
Patented Case
View Patent ↗
Granted: Feb 29, 2000
Filed: Jan 15, 1999
Inventor
Don V. Carruth
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.