Granted Patent
Utility
US 6,143,280 · App. 09/314,414
Color containing silica resistant to dye migration and method of making the same
Inventors:
Kathleen Pike, John A. Kostinko
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: May 18, 1999
Inventors
Kathleen Pike
John A. Kostinko
Assignee (at issue)
J.M. Huber 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.