Granted Patent
Utility
US 4,658,803 · App. 06/791,161
Gas-fired water heaters
Inventors:
Geoffrey Ball, Robin Galliver, Martin White
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Oct 24, 1985
Inventors
Geoffrey Ball
Robin Galliver
Martin White
Assignee (at issue)
British Gas
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.