Granted Patent
Utility
US 6,533,412 · App. 10/199,029
Interchangeable eyeglass lens system and method
Inventors:
Chih Kuan Wang, Tianshi Wang
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Jul 22, 2002
Inventors
Chih Kuan Wang
Tianshi Wang
Assignee (at issue)
Navajo Manufacturing Company, Inc.
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.