Granted Patent
Utility
US 5,814,143 · App. 08/976,230
Zirconium modified synthetic alkali metal silicate pigment and method of making
Inventors:
Gary M. Freeman, Richard C. Zielke
Patented Case
View Patent ↗
Granted: Sep 29, 1998
Filed: Nov 21, 1997
Inventors
Gary M. Freeman
Richard C. Zielke
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.