Granted Patent
Utility
US 4,856,491 · App. 07/173,236
High efficiency solid fuel burning stove
Inventors:
Robert W. Ferguson, Derik K. Andors
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Mar 25, 1988
Inventors
Robert W. Ferguson
Derik K. Andors
Assignee (at issue)
Vermont Castings, 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.