Granted Patent
Utility
US 5,881,681 · App. 08/787,823
Water heating system
Inventor:
Kevin Stuart
Patented Case
View Patent ↗
Granted: Mar 16, 1999
Filed: Jan 23, 1997
Inventor
Kevin Stuart
Assignee (at issue)
Aerco International, Inc.
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.