Granted Patent
Utility
US 6,179,276 · App. 09/251,558
Heat and mass transfer element assembly
Inventors:
Michael Chen, Carl-Olof Olsson
Patented Case
View Patent ↗
Granted: Jan 30, 2001
Filed: Feb 17, 1999
Inventors
Michael Chen
Carl-Olof Olsson
Assignee (at issue)
ABB Air Preheater 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.