Phyllis C. Kaiser, US1823904A
Thumb Sucking Preventive.
Image credit: Kaiser, P.C. (1929)
On September 22, 1931, Phyllis C. Kaiser of Bervely Hills, California, patented a simple adhesive-tape device to prevent children from sucking their fingers. By wrapping the tape around the digit to create small, outward-projecting tabs that felt unpleasant in the mouth, her design discouraged the habit while allowing normal finger movement.
Date of Application: 23 October 1929
Date of Issuance: 22 September 1931
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Francesca Chiaradia
PhD Candidate in Economics
My research interests include innovation, law, and information economics.