Granted Patent
Utility
US 5,845,697 · App. 08/929,822
Spring loop with protective covering
Inventor:
Yu Zheng
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: Sep 15, 1997
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.