Granted Patent
Utility
US 6,668,847 · App. 10/307,769
Collapsible structures
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Dec 2, 2002
Inventor
Yu Zheng
Assignee (at issue)
Patent Category Corp.
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.