US Patent 1,837,958 — B. D. Ferrero, Inventor

US Patent 1,837,958 was filed on 29 March 1930 and granted on 22 December 1931. The named inventor is B. D. Ferrero nee Willmann. The patent covers an innovation in fashion support technology. This document serves two functions in the dossier. First, it confirms that Blanche Denise was present and professionally active in the United States in 1930, consistent with the 1907 emigration and contradicting any claim of a Paris portrait sitting in the 1920s or 1930s. Second, it establishes her independent historical identity: she is not only the subject of a portrait, but a person with a documented professional record who invented, filed, and received a patent in her own name.