Granted Patent
Utility
US 6,155,281 · App. 09/059,811
Collapsible structures
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Dec 5, 2000
Filed: Apr 14, 1998
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.