Granted Patent
Utility
US 5,906,843 · App. 08/868,107
Amorphous precipitated silica having large liquid carrying capacity
Inventors:
James T. Dew, Larry R. Evans, Diana L. Scott, Walter H. Waddell
Patented Case
View Patent ↗
Granted: May 25, 1999
Filed: Jun 3, 1997
Inventors
James T. Dew
Larry R. Evans
Diana L. Scott
Walter H. Waddell
Assignee (at issue)
PPG Industries, 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.