Granted Patent
Utility
US 4,248,739 · App. 06/071,957
Stabilized pillared interlayered clays
Inventors:
David E. W. Vaughan, Roger J. Lussier, John S. Magee, Jr.
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Sep 4, 1979
Inventors
David E. W. Vaughan
Roger J. Lussier
John S. Magee, Jr.
Assignee (at issue)
W. R. Grace & Co.
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.