Granted Patent
Utility
US 5,722,446 · App. 08/778,878
Collapsible structures
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Jan 2, 1997
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.