Granted Patent
Utility
US 5,358,440 · App. 08/178,050
Collapsible flying disc
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Jan 6, 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.