Granted Patent
Utility
US 6,491,111 · App. 09/617,333
Rotary impact tool having a twin hammer mechanism
Inventors:
Patrick Livingston, Kevin R. Morey
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jul 17, 2000
Inventors
Patrick Livingston
Kevin R. Morey
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.