Granted Patent
Utility
US 6,539,411 · App. 09/181,815
Direct digital synthesizer
Inventor:
Robert Everest Johnson
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Oct 29, 1998
Inventor
Robert Everest Johnson
Assignee (at issue)
LUCENT TECHNOLOGIES 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.