Granted Patent
Utility
US 4,653,522 · App. 06/882,778
Ground hydrant and method for operating same
Inventors:
Russell L. Fillman, Reinhard Srajer
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Jul 7, 1986
Inventors
Russell L. Fillman
Reinhard Srajer
Assignee (at issue)
Woodford Manufacturing 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.