Granted Patent
Utility
US 6,574,333 · App. 09/442,870
State machine based universal voice grade cards
Inventors:
E. Barton Manchester, Bradley N. Yearwood
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Nov 18, 1999
Inventors
E. Barton Manchester
Bradley N. Yearwood
Assignee (at issue)
Next Level 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.