Granted Patent
Utility
US 5,999,339 · App. 09/130,759
Hand-held magnifying device
Inventors:
Wai Hing Kam, Yau Chung Siu, Eric Toriumi
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Aug 7, 1998
Inventors
Wai Hing Kam
Yau Chung Siu
Eric Toriumi
Assignee (at issue)
Learning Resources, 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.