Granted Patent
Utility
US 6,382,310 · App. 09/638,347
Stepped heat exchanger coils
Inventor:
Sean A. Smith
Patented Case
View Patent ↗
Granted: May 7, 2002
Filed: Aug 15, 2000
Inventor
Sean A. Smith
Assignee (at issue)
American Standard 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.