Granted Patent
Utility
US 5,016,448 · App. 07/118,679
Internal heat exchanger for an absorption apparatus
Inventor:
William J. Plzak
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Nov 9, 1987
Inventor
William J. Plzak
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.