Mary Kenner

Her father, whom she credited for her initial interest in discovery, was Sidney Nathaniel Davidson (June 1890 – November 1958).

In his lifetime, he patented a clothing press which would fit in suitcases, though he ultimately made no money on the invention.

Her father also patented a window washer for trains and invented a stretcher with wheels for ambulances.

Her grandfather invented a light signal for trains, though this invention was stolen from him by a white man.

Mary Beatrice Davidson Kenner (May 17, 1912 – January 13, 2006) was an American inventor most noted for her development of the adjustable sanitary belt.

Kenner received five patents, which includes a carrier attachment for invalid walker and bathroom tissue dispenser.

Kenner was born in Monroe, North Carolina, and came from a family of inventors.

She reportedly had a child that few knew of until recently, a daughter named Jasmine who grew up in South Dallas.

Her sister, Mildred Davidson Austin Smith (1916–1993), invented, patented, and commercially sold board games.

Kenner and her family moved to Washington, D.C., in 1924; here she walked the corridors of the United States Patent and Trademark Office to better understand how inventions become patents.

Kenner graduated from Dunbar High School in 1931.

She attended Howard University, however she was unable to finish due to financial difficulties and dropped out after 18 months.

Kenner did not receive any college degree or professional training.

Women at the time were kept out of scientific establishments or academic institutions.

Kenner showed mechanical aptitude at the age of six by attempting to develop a self-oiling hinge.

She would chaperone younger women to attend military base dances in Washington, D.C. One night while chaperoning, Kenner met and fell in love with a soldier, whom she married in 1945.

They divorced in 1950.

In 1951, Kenner was married to renowned heavyweight boxer James "Jabbo" Kenner.

Together, they lived in McLean, Virginia, near the Kennedy family complex.

They were foster parents to five boys.

She completed the patent application for her invention of the adjustable sanitary belt in 1954 and the patent was granted in 1956.

The invention was described as an eliminator for “chafing and irritation normally caused by devices of [its] class.” However, the company that first showed interest in her invention, the Sonn-Nap-Pack Company, rejected it after they discovered that she was African American.

Kenner never made any money from the sanitary belt, because her patent expired and became public domain, allowing it to be manufactured freely.

She later invented a modification of the sanitary belt that included a "moisture resistant pocket."

In an interview, Mary Kenner said, "one day I was contacted by a company that expressed an interest in marketing my idea. I was so jubilant ... I saw houses, cars, and everything about to come to my way."

A representative made their way to Washington to speak with Kenner and she continues to explain that they had rejected her by saying, "Sorry to say, when they found out I was black, their interest dropped. The representative went back to New York and informed me the company was no longer interested."

Between 1956 and 1987 she received five total patents for her household and personal item creations, which is the largest number of patents held by a black woman.

She shared the patent on the toilet tissue holder with her sister, Mildred Davidson.

She also held a patent on a back washer that could be mounted on the shower or bathtub wall, also known as a backwash.

She also patented the carrier attachment for a walker in 1959, after Mildred developed multiple sclerosis.

Mary Kenner worked as a professional floral arranger and had four flower shops scattered around the DC area.

She operated the business for 23 years after dropping out of college due to financial difficulties.

During World War II, Mary found a job with the federal government, working for the Census Bureau and General Accounting Office.

This invention was patented in 1987, with patent number 4696068.