Granted Patent
Utility
US 4,900,529 · App. 06/812,163
Process for making crystalline siliceous materials
Inventors:
Moises G. Sanchez, Charles Chang, Norman R. Laine, Sandra M. Waters
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Dec 23, 1985
Inventors
Moises G. Sanchez
Charles Chang
Norman R. Laine
Sandra M. Waters
Assignee (at issue)
W.R. Grace & Co. Conn.
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.