Granted Patent
Utility
US 5,775,268 · App. 08/637,224
High efficiency vertical tube water heater apparatus
Inventor:
Mark A. Ferguson
Patented Case
View Patent ↗
Granted: Jul 7, 1998
Filed: Apr 24, 1996
Inventor
Mark A. Ferguson
Assignee (at issue)
PVI Industries, LLC
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.