Granted Patent
Utility
US 5,935,543 · App. 08/909,041
Amorphous precipitated silica
Inventors:
James L. Boyer, Thomas G. Krivak, Robert C. Wang, Laurence E. Jones
Patented Case
View Patent ↗
Granted: Aug 10, 1999
Filed: Aug 8, 1997
Inventors
James L. Boyer
Thomas G. Krivak
Robert C. Wang
Laurence 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.