Granted Patent
Utility
US 4,727,737 · App. 06/948,125
Method and apparatus for bending a heat exchanger coil
Inventor:
Ralph S. Bryant
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Dec 31, 1986
Inventor
Ralph S. Bryant
Assignee (at issue)
Heil-Quaker Home Systems, 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.