Granted Patent
Utility
US 5,240,488 · App. 07/930,125
Manufacture of vitreous silica product via a sol-gel process using a polymer additive
Inventors:
Edwin Arthur Chandross, Debra Anne Fleming, David W. Johnson, Jr., John B. MacChesney, Frederick W. Walz, Jr.
Patented Case
View Patent ↗
Granted: Aug 31, 1993
Filed: Aug 14, 1992
Inventors
Edwin Arthur Chandross
Debra Anne Fleming
David W. Johnson, Jr.
John B. MacChesney
Frederick W. Walz, Jr.
Assignee (at issue)
AT&T Bell Laboratories
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.