Theodosia Hamner, US1239388A
Strainer.
Image credit: Hamner, T. (1917)
On September 4, 1917, Theodosia Hamner of Los Angeles, California, patented an improved strainer designed especially for milk and other liquids. Her invention used a removable fabric sack secured by a coiled wire frame with built-in handles, allowing the strainer to fit containers of various sizes and be easily taken apart for cleaning.
Date of Application: 20 May 1916
Date of Issuance: 4 September 1917
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Francesca Chiaradia
PhD Student in Economics
My research interests include law and economics, economics of innovation, and information economics.