Granted Patent
Utility
US 5,560,385 · App. 08/281,369
Collapsible play structures
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Oct 1, 1996
Filed: Jul 27, 1994
Inventor
Yu Zheng
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.