Granted Patent
Utility
US 6,176,575 · App. 09/383,048
Drum maintenance unit life extension
Inventors:
Timothy L. Crawford, David W. Johnson, Gerard Rousseau
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Aug 25, 1999
Inventors
Timothy L. Crawford
David W. Johnson
Gerard Rousseau
Assignee (at issue)
Xerox Corporation
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.