Granted Patent
Utility
US 6,597,863 · App. 09/813,337
Device for keeping a portion of a body of water free from ice
Inventor:
James Donald Koskey, Jr.
Patented Case
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Granted: Jul 22, 2003
Filed: Mar 20, 2001
Inventor
James Donald Koskey, Jr.
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.