Granted Patent
Utility
US 6,533,451 · App. 10/033,753
Underwater electromechanical timer
Inventor:
Ruey-Shan Liu
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Dec 19, 2001
Inventor
Ruey-Shan Liu
Assignee (at issue)
CHUNG-SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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.