Granted Patent
Utility
US 5,971,868 · App. 08/972,561
Contoured back surface of golf club face
Inventor:
John B. Kosmatka
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Nov 18, 1997
Inventor
John B. Kosmatka
Assignee (at issue)
Callaway Golf 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.