ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,419,377, issued on Sept. 23.
"Protective helmet" was invented by Dennis A. Knaus (Malvern, Pa.) and John T. Desko (Syracuse, N.Y.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A protective helmet comprising a helmet shell having at least two layers and the helmet shell having a flexural modulus from 50 MPa to 600 MPa as measured using ASTM D 790 B and a non-foamed specific gravity in the range of 0.916 g/cm3 up to 1.60 g/cm3. More than one helmet shell may be combined to provide greater protection to the wearer. The layers may be constructed of an open cell foam, a waterproof coating layer, a separator layer, a flexible layer, a slightly foamed layer,...