Granted Patent
Utility
US 6,731,890 · App. 10/294,378
Transfer of toner using a time-varying transfer station current
Inventors:
David M. Rakov, Frank A. Shuster
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Nov 14, 2002
Inventors
David M. Rakov
Frank A. Shuster
Assignee (at issue)
NexPress Solutions LLC
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.