Granted Patent
Utility
US 3,963,424 · App. 05/359,985
Cooling aqueous alkali metal hydroxide liquors by vacuum evaporation with subsequent solids precipitate removal
Inventor:
Frank Bella, Jr.
Patented Case
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Granted: Jun 15, 1976
Filed: May 14, 1973
Inventor
Frank Bella, Jr.
Assignee (at issue)
Whiting 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.