Granted Patent
Utility
US 6,467,500 · App. 09/814,106
Ball valve locking device
Inventor:
Semyon Fridlyand
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Mar 22, 2001
Inventor
Semyon Fridlyand
Assignee (at issue)
MUELLER COMPANY
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.