Granted Patent
Utility
US 5,129,416 · App. 07/721,934
Anti-siphon frost-proof water hydrant
Inventor:
Rand H. Ackroyd
Patented Case
View Patent ↗
Granted: Jul 14, 1992
Filed: Jun 27, 1991
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.