Granted Patent
Utility
US 6,141,986 · App. 09/196,598
Indirect supplemental evaporation cooler
Inventor:
Edward C. Koplin
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: Nov 20, 1998
Inventor
Edward C. Koplin
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.