ALEXANDRIA, Va., July 23 -- United States Patent no. 12,365,429, issued on July 22, was assigned to HARDCASTLE MANUFACTURING (Mendota Heights, Minn.).
"Nose plug for underwater diving" was invented by William Hardcastle (Mendota Heights, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A nose plug for performing a pressure equalization maneuver while underwater diving may include a base, a first nasal insert, and a second nasal insert. The first nasal insert and/or the second nasal insert may project from the base. The first nasal insert may fit snuggly within and may protrude deeply into a first nostril of a user when in use such that airflow through the first nostril is prevented. The second nasal inse...