Granted Patent
Utility
US 4,239,568 · App. 05/922,754
Method of manufacturing a ball
Inventor:
Kazuyasu Takazawa
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Jul 7, 1978
Inventor
Kazuyasu Takazawa
Assignee (at issue)
Tachikara Co., Ltd.
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.