Granted Patent
Utility
US 5,591,010 · App. 08/375,022
Time shift control of wastewater pumping system
Inventor:
Ian D. Van Zyl
Patented Case
View Patent ↗
Granted: Jan 7, 1997
Filed: Jan 19, 1995
Inventor
Ian D. Van Zyl
Assignee (at issue)
Milltronics Ltd.
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.