Granted Patent
Utility
US 6,406,678 · App. 09/817,519
Process for production of high purity amorphous silica from biogenic material
Inventor:
Larry W. Shipley
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Mar 26, 2001
Inventor
Larry W. Shipley
Assignee (at issue)
Process Management, 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.