Granted Patent
Utility
US 4,877,014 · App. 07/144,971
Tube arrangement for heat exchanger
Inventor:
John A. Beasley
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Jan 19, 1988
Inventor
John A. Beasley
Assignee (at issue)
American Standard 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.