Granted Patent
Utility
US 6,557,192 · App. 09/752,633
Sleeping bag with enhancements
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Jan 2, 2001
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.