Granted Patent
Utility
US 6,425,664 · App. 09/874,419
Folding device of glasses
Inventors:
Jung-Chuan Liu, Chih-Hsin Liu
Patented Case
View Patent ↗
Granted: Jul 30, 2002
Filed: Jun 6, 2001
Inventors
Jung-Chuan Liu
Chih-Hsin Liu
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.