Granted Patent
Utility
US 5,566,704 · App. 08/369,412
Backflow preventer and test cock assembly
Inventors:
Rand H. Ackroyd, Steven Hofmann
Patented Case
View Patent ↗
Granted: Oct 22, 1996
Filed: Jan 6, 1995
Inventors
Rand H. Ackroyd
Steven Hofmann
Assignee (at issue)
Watts Investment 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.