Granted Patent
Utility
US 5,696,487 · App. 08/389,908
Audible fire alarm apparatus
Inventor:
Hong-Seok Choi
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Feb 16, 1995
Inventor
Hong-Seok Choi
Assignee (at issue)
Pyeong-Hwa Electronic Co.
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.