Granted Patent
Utility
US 6,019,160 · App. 09/212,725
Heat transfer element assembly
Inventor:
Michael Chen
Patented Case
View Patent ↗
Granted: Feb 1, 2000
Filed: Dec 16, 1998
Inventor
Michael Chen
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.