Granted Patent
Utility
US 5,738,021 · App. 08/597,588
Adjustable sleeve damper assembly for a coal-fired furnace
Inventors:
Joel Vatsky, Walter Van Dyke
Patented Case
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Granted: Apr 14, 1998
Filed: Feb 6, 1996
Inventors
Joel Vatsky
Walter Van Dyke
Assignee (at issue)
Foster Wheeler Energy International, 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.