Approximate date when Leona Chalmers patented an updated design of her menstrual cup, this was after the rubber shortage during World War II. This redesign may have incorporated new materials or addressed issues identified with the original design.
Leona Chalmers files U.S. patent 2,089,113 for a 'Catamenial Receptacle', marking a key milestone in the development and protection of her menstrual cup design.
Approximate date of the first version of the menstrual cup created by Leona Chalmers, shortly after the invention of the tampon. This was a significant step in the development of reusable menstrual products as an alternative to disposable options.
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