Granted Patent
Utility
US 6,651,344 · App. 10/119,053
Foldable knife structure
Inventor:
Yang Cheng
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Apr 10, 2002
Inventor
Yang Cheng
Assignee (at issue)
KANTAS PRODUCTS 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.