Granted Patent
Utility
US 6,684,894 · App. 09/962,041
Collapsible structures having overlapping support loops
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Sep 24, 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.