Granted Patent
Utility
US 5,052,655 · App. 07/554,693
Ball valve lock plate
Inventor:
Rand H. Ackroyd
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Jul 18, 1990
Inventor
Rand H. Ackroyd
Assignee (at issue)
Watts Regulator Co.
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.