Granted Patent
Utility
US 4,838,210 · App. 07/216,098
Pre-formed insulating reversing chamber for modified scotch boiler or the like
Inventor:
Richard H. Kirby
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Jul 7, 1988
Inventor
Richard H. Kirby
Assignee (at issue)
BURNHAM HOLDINGS, 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.