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Centrifugal Separator.
Patent for a centrifuge that can effectively and efficiently separate heavy oils from acids "with which the oil has been mixed or emulsified as a clarifying or decolorizing agent" (lines 14-16), with illustrations.
Date:
March 14, 1922
Creator:
Paul, Christian F., Jr.
System:
The Portal to Texas History
Knee Pad.
Patent for an improved knee pad, which provides better ventilation and cushioning to the knee, including illustrations.
Date:
November 21, 1922
Creator:
Rylander, Parrish H.
System:
The Portal to Texas History