Granted Patent
Utility
US 4,835,828 · App. 07/247,987
Automatic tube expander for a heat exchanger
Inventors:
John D. York, Edward M. Peppard, Bruce A. Haugen
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Sep 22, 1988
Inventors
John D. York
Edward M. Peppard
Bruce A. Haugen
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.