On the 8th day of Black History Month, we proudly salute inventor Mary Beatrice Davidson Kenner—a visionary who secured five U.S. patents despite relentless racial and financial barriers, and who held the record at the time for the most patents awarded to an African American woman.
Kenner is best known for inventing the adjustable sanitary belt (patented in 1957), a groundbreaking precursor to the modern maxi pad. Designed with a moisture-proof pocket to prevent leaks, it improved comfort and hygiene at a time when menstrual products were extremely limited. Although a company initially expressed interest in marketing her invention, that interest disappeared once they learned she was Black—and Kenner never profited from her idea.
Her brilliance extended far beyond menstrual health. Among her inventions were:
- Sanitary Belt (1956/1957): An adjustable belt with a moisture-proof pocket to securely hold sanitary napkins.
- Walker Carrier Attachment (1959; improved and patented 1976): A serving tray and pocket that attach to a walker, inspired by her sister’s struggle with multiple sclerosis.
- Bathroom Tissue Holder (1982): A device that ensures the loose end of toilet paper is always within reach.
- Mounted Back Washer/Massager (1987): A shower-mounted device designed to help users clean and massage their backs independently.
(Including U.S. Patent No. 3,957,071 among her portfolio.)
Background & Life
Born on May 17, 1912, in Monroe, North Carolina, Kenner came from a family of inventors—her father, sister, and grandfather all held patents. In 1924, her family moved to Washington, D.C. She graduated from Dunbar High School in 1931 and enrolled at Howard University, but was forced to leave due to financial hardship. She worked various jobs, including as a federal employee during World War II, and later became a professional florist—all while inventing in her spare time.
In 1951, Kenner married James “Jabbo” Kenner. Together, they fostered five children and adopted one son. Despite lacking formal engineering training and facing systemic racism, Kenner never stopped creating practical solutions to improve everyday life.
Mary Beatrice Davidson Kenner passed away on January 13, 2006, in Washington, D.C., at the age of 93. Though she never received widespread recognition, wealth, or awards during her lifetime, her inventions left an enduring legacy—quietly improving independence, dignity, and daily living for countless people.
Thank you, Mary Beatrice Davidson Kenner. Your genius, resilience, and impact will not be forgotten.
