Granted Patent
Utility
US 6,469,083 · App. 09/873,488
No dry master batch for polyester resins
Inventor:
Robert J. Opalko
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Jun 4, 2001
Inventor
Robert J. Opalko
Assignee (at issue)
Ferro 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.