Granted Patent
Utility
US 6,408,461 · App. 09/553,651
Collapsible assembly
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Apr 21, 2000
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.