Granted Patent
Utility
US 6,571,077 · App. 09/859,129
Electrostatic image developing method and apparatus using a drum photoconductor and hard magnetic carriers
Inventors:
John R. Thompson, Timothy G. Armstrong, Richard George Allen, Thomas K. Hilbert, Christopher S. Garcia
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: May 16, 2001
Inventors
John R. Thompson
Timothy G. Armstrong
Richard George Allen
Thomas K. Hilbert
Christopher S. Garcia
Assignee (at issue)
Heidelberger Druckmaschinen AG
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.