Granted Patent
Utility
US 5,898,017 · App. 08/914,093
Multicolor chromogenic system having improved image quality
Inventor:
John C. H. Chang
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Aug 19, 1997
Inventor
John C. H. Chang
Assignee (at issue)
Wallace Computer Services, Inc.
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.