Granted Patent
Utility
US 4,664,618 · App. 06/642,075
Recuperative furnace wall
Inventor:
Grigory M. Gitman
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Aug 16, 1984
Inventor
Grigory M. Gitman
Assignee (at issue)
American Combustion, 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.