Granted Patent
Utility
US 6,581,313 · App. 09/912,896
Collapsible structures supported on a pole
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Jul 25, 2001
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.