Granted Patent
Utility
US 5,125,429 · App. 07/643,750
Piston pressure-type vacuum breaker
Inventors:
Rand H. Ackroyd, Steven Hofmann
Patented Case
View Patent ↗
Granted: Jun 30, 1992
Filed: Jan 23, 1991
Inventors
Rand H. Ackroyd
Steven Hofmann
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.