Granted Patent
Utility
US 6,510,908 · App. 09/681,133
Blasthole drill with rotary head carriage resiliently held on a mast
Inventor:
Neil E. Borgman
Patented Case
View Patent ↗
Granted: Jan 28, 2003
Filed: Jan 18, 2001
Inventor
Neil E. Borgman
Assignee (at issue)
Hernischfeger Technologies, 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.