Granted Patent
Utility
US 6,357,510 · App. 09/286,800
Collapsible support frames
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Apr 6, 1999
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.