Granted Patent
Utility
US 4,434,028 · App. 06/255,037
Apparatus for removing organic contaminants from inorganic-rich mineral solids
Inventors:
Christopher P. Eppig, Bruce M. Putnam, Richard P. de Filippi
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Apr 17, 1981
Inventors
Christopher P. Eppig
Bruce M. Putnam
Richard P. de Filippi
Assignee (at issue)
Critical Fluid Systems, Inc.
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.