Granted Patent
Utility
US 4,262,518 · App. 06/058,058
Tube expander and method
Inventors:
Todd D. Creger, Steven R. Nelson, Paul L. Wright
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Jul 16, 1979
Inventors
Todd D. Creger
Steven R. Nelson
Paul L. Wright
Assignee (at issue)
Caterpillar Tractor Co.
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.