Granted Patent
Utility
US 4,530,231 · App. 06/165,731
Method and apparatus for expanding tubular members
Inventor:
Perry A. Main
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Jul 3, 1980
Inventor
Perry A. Main
Assignee (at issue)
APX Group, 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.