Granted Patent
Utility
US 6,457,798 · App. 09/721,948
Six gray level roofshooter fluid ejector
Inventor:
Donald J. Drake
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Nov 27, 2000
Inventor
Donald J. Drake
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.