Granted Patent
Utility
US 6,643,929 · App. 10/181,294
Method of producing ball valve
Inventor:
Masahiro Yokomi
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Jul 16, 2002
Inventor
Masahiro Yokomi
Assignee (at issue)
TIX Corporation
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.