Granted Patent
Utility
US 6,017,972 · App. 09/322,589
Controlled color laser marking of plastics
Inventors:
Ronald M. Harris, Ke Feng, Alan R. Burgess
Patented Case
View Patent ↗
Granted: Jan 25, 2000
Filed: May 28, 1999
Inventors
Ronald M. Harris
Ke Feng
Alan R. Burgess
Assignee (at issue)
M.A. HannaColor
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.