Granted Patent
Utility
US 5,390,749 · App. 08/191,821
Apparatus for positioning a split retaining ring in a down-hole percussive drill
Inventor:
Leland H. Lyon
Patented Case
View Patent ↗
Granted: Feb 21, 1995
Filed: Jan 31, 1994
Inventor
Leland H. Lyon
Assignee (at issue)
Ingersoll-Rand Company
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.