Granted Patent
Utility
US 4,813,055 · App. 07/136,692
Furnace cooling system and method
Inventors:
Ronald G. Heggart, Willard K. McClintock, Randy J. Engstrom
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Dec 22, 1987
Inventors
Ronald G. Heggart
Willard K. McClintock
Randy J. Engstrom
Assignee (at issue)
Union Carbide Corporation
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.