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My grandfather, Norbert R. Hahn, holds a patent dated 8/20/40 for the mascara brush. Other information, Des. 122,019. Can someone help me locate more information regarding this patent? I hold the actual patent and prototype.

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It is for a mascara brush not the mascara brush. Specifically, as a design patent, it is for the design or "look" pictured. enter image description here

An earlier design of a mascar brush is D109634. You can see the patent you referenced on google patents here: Norbert Halm. If you are interested it should be possible to order a copy of all of the correspondence between the applicant and the USPTO.

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