Granted Patent
Utility
US 5,201,807 · App. 07/842,071
Gas-fired water heater
Inventors:
Gary Liljenberg, Richard K. Nelson, John Schmidt
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Feb 26, 1992
Inventors
Gary Liljenberg
Richard K. Nelson
John Schmidt
Assignee (at issue)
Gas Research Institute
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.