Granted Patent
Utility
US 5,881,803 · App. 08/805,980
Heat exchanger construction
Inventors:
Johnny Liu, Gary H. Johnson
Patented Case
View Patent ↗
Granted: Mar 16, 1999
Filed: Feb 25, 1997
Inventors
Johnny Liu
Gary H. Johnson
Assignee (at issue)
THMX Holdings, LLC
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.