Granted Patent
Utility
US 4,294,793 · App. 06/125,389
Method and apparatus for manufacturing a spherical hollow body
Inventor:
Kazuyasu Takazawa
Patented Case
View Patent ↗
Granted: Oct 13, 1981
Filed: Feb 27, 1980
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.