Granted Patent
Utility
US 4,775,480 · App. 07/008,176
Membrane processes for treatment of and recovery of components from kraft black liquors
Inventors:
Everett C. Milton, Harry P. Gregor
Patented Case
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Granted: Oct 4, 1988
Filed: Jan 29, 1987
Inventors
Everett C. Milton
Harry P. Gregor
Assignee (at issue)
GnB
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.