Granted Patent
Utility
US 5,964,673 · App. 08/791,464
Hollow metal bat with stiffened transition zone and method of making same
Inventor:
Jack W. MacKay, Jr.
Patented Case
View Patent ↗
Granted: Oct 12, 1999
Filed: Jan 27, 1997
Inventor
Jack W. MacKay, Jr.
Assignee (at issue)
Hellerich & Brasby 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.