Granted Patent
Utility
US 4,674,170 · App. 06/781,972
Method of making a ball having a foamed spherical center core, windings and cover
Inventors:
David W. Hubbert, Bobby L. Robinson
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Sep 30, 1985
Inventors
David W. Hubbert
Bobby L. Robinson
Assignee (at issue)
Athlone Industries, 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.