The Little-Known Story Of Mary Kenner, The First Black American Woman To Earn Five Patents
The moisture-proof element of her sanitary belt design appeared again here in a different application: the use of a moisture-maintaining component to serve a functional purpose.
This kind of cross-pollination between inventions — the application of a successful design principle in one context to a different problem in another — is characteristic of inventive minds that think systematically about materials and mechanisms.
Her fifth patent, U.S.
Patent 3,866,940, was granted in 1975.
This patent covered an improved bathroom tissue holder.
The specific innovation was a holder that incorporated a pocket or auxiliary receptacle alongside the tissue holder itself, providing storage for additional rolls of tissue or for other small bathroom items within easy reach of the toilet.
The design was intended to reduce the common inconvenience of running out of toilet paper in a bathroom without a readily accessible spare.