Granted Patent
Utility
US 4,998,243 · App. 07/419,234
ISDN terminal adapter with teleconference provision
Inventor:
Ming-Luh Kao
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Oct 10, 1989
Inventor
Ming-Luh Kao
Assignee (at issue)
Racal Data Communications, 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.