Granted Patent
Utility
US 4,892,300 · App. 07/198,472
Differential document drive
Inventor:
Eduard Svyatsky
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: May 25, 1988
Inventor
Eduard Svyatsky
Assignee (at issue)
Bell and Howell, 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.