Granted Patent
Utility
US 5,911,963 · App. 08/439,731
Amorphous precipitated silica having a low proportion of small pores
Inventors:
Thomas G. Krivak, Larry E. Jones
Patented Case
View Patent ↗
Granted: Jun 15, 1999
Filed: May 12, 1995
Inventors
Thomas G. Krivak
Larry E. Jones
Assignee (at issue)
PPG Industries Ohio, 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.