Granted Patent
Utility
US 4,429,009 · App. 06/315,597
Process for surface conversion of vitreous silica to cristobalite
Inventors:
Ricardo C. Pastor, Luisa E. Gorre, Antonio C. Pastor, Remedios K. Chew
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Oct 30, 1981
Inventors
Ricardo C. Pastor
Luisa E. Gorre
Antonio C. Pastor
Remedios K. Chew
Assignee (at issue)
Hughes Aircraft Company
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.