Granted Patent
Utility
US 5,910,058 · App. 09/042,852
Portable play structures
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Jun 8, 1999
Filed: Mar 17, 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.