Still More Inventions by Women

In 1949, Marion Donovan's first successful invention called "Boaters" was a waterproof baby diaper cover that prevented diaper rash. She also created the disposable diapers, Pampers in 1961.

Hedy Lamarr the actress, patented a secret communications system in 1941. The system manipulated radio frequencies with an unbreakable code to prevent classified messages from being intercepted by enemies. The device was meant to be used against the Nazis in WWII, but in actuality it came into use 20 years later. Lamarr was raised in Austria, grew to despise the Nazis and eventually escaped to London and then to the U.S.

African American, Alice H. Parker filed the first U.S. patent for the precursor to a central heating system in 1919. The system was able to regulate the temperature of a building and carry heat from room to room. The drawings included for the patent show a heating furnace powered by gas. An entire house required several heating units, each controlled by individual hot air ducts. The ducts directed heat to different parts of a building structure.