Granted Patent
Utility
US 6,747,867 · App. 10/001,789
Elevated and lower keyboard apparatus
Inventor:
Chien-Shih Hsu
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Dec 5, 2001
Inventor
Chien-Shih Hsu
Assignee (at issue)
DARFON ELECTRONICS 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.