Nora F. Hays, US1854738A
Dirt Collector.
Image credit: Hays, N.F. (1930)
On April 19, 1932, Nora F. Hays of Wilmerding, Pennsylvania, received a patent for an improved dirt collector designed to remove moisture and debris from pressurized air systems. Her design featured a collecting chamber with a conical valve that allowed accumulated water to be discharged quickly and safely.
Date of Application: 18 March 1930
Date of Issuance: 19 April 1932
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Francesca Chiaradia
PhD Student in Economics
My research interests include law and economics, economics of innovation, and information economics.