Granted Patent
Utility
US 4,529,340 · App. 06/478,246
Drilling method and apparatus
Inventor:
David L. O'Dell
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Mar 24, 1983
Inventor
David L. O'Dell
Assignee (at issue)
Wheelabrator-Frye 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.