Granted Patent
Utility
US 6,007,439 · App. 08/838,739
Vibration dampener for metal ball bats and similar impact implements
Inventor:
Jack W. MacKay, Jr.
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Apr 14, 1997
Inventor
Jack W. MacKay, Jr.
Assignee (at issue)
Hillerich & Bradsby Co.
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.