Granted Patent
Utility
US 4,873,701 · App. 07/097,448
Modem and method for 8 dimensional trellis code modulation
Inventor:
Steven A. Tretter
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Sep 16, 1987
Inventor
Steven A. Tretter
Assignee (at issue)
Penril Corporation
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.