Granted Patent
Utility
US 4,319,472 · App. 06/128,328
Tube end expander and method of operating the same
Inventor:
Gregory Martin
Patented Case
View Patent ↗
Granted: Mar 16, 1982
Filed: Mar 7, 1980
Inventor
Gregory Martin
Assignee (at issue)
CARRIER CORPORATION
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.