Celia Broudy; Isadore Broudy, US1801949A
Register Filter.
Image credit: Broudy, C. & Broudy, I. (1928)
On April 21, 1931, Celia and Isadore Broudy of Detroit, Michigan, patented a register filter designed to attach easily to a hot-air register and remove dust and other particles from the air passing through. The device used a simple metal frame holding layered screens and filter material, allowing quick attachment, removal, and cleaning while still permitting adjustment of the register’s airflow control.
Date of Application: 20 October 1928
Date of Issuance: 21 April 1931
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Francesca Chiaradia
PhD Student in Economics
My research interests include law and economics, economics of innovation, and information economics.