Granted Patent
Utility
US 5,208,855 · App. 07/763,001
Method and apparatus for irrigation control using evapotranspiration
Inventor:
Michael Marian
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Sep 20, 1991
Inventor
Michael Marian
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.