Granted Patent
Utility
US 5,214,641 · App. 07/758,347
Mixed analog digital secondary channel FSK modem
Inventors:
Ching-Siang Chen, Bert White
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Sep 9, 1991
Inventors
Ching-Siang Chen
Bert White
Assignee (at issue)
SILICONSYSTEMS, 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.