Granted Patent
Utility
US 4,339,352 · App. 06/238,272
Sorptive clay composition and method of manufacture
Inventors:
Frank Pitts, Jack A. Tiethof, Robert Burns
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Feb 25, 1981
Inventors
Frank Pitts
Jack A. Tiethof
Robert Burns
Assignee (at issue)
Engelhard Minerals & Chemicals Corporation
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.