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in subjects: "acids"  
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Chemical Fire-Extingusiher.

Description: Patent for a chemical fire-extinguisher meant to "provide an improved acid-receptacle which will obviate the objects to the ordinary acid-bottles now in use" (lines 15-18).
Date: December 31, 1896
Creator: Flatau, Louis, S.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Centrifugal Separator.

Description: 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.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Apparatus for Recutting Files.

Description: Patent for a new and improved file re-cutter. This design consists "[i]n an apparatus for recutting files by electro-chemical action, the dialectric plates and the carbon plates having their upper ends attached to said non-conducting plates, whereby the files to be recut are disposed between the carbon plates when in the solution" (lines 76-82).
Date: April 5, 1887
Creator: Emley, James E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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