Inventions by Women That Changed History

History books have not always given credit where it was due, but women inventors have shaped the way we cook, travel, compute, heal and play. This guide highlights inventions and breakthroughs by women that changed history, from nineteenth-century kitchen machines to modern medicine.

Many of these inventors worked at a time when women faced legal and social barriers to education, patents and business. Some shared credit with collaborators, and a few stories have become blurred over time, so the dates below focus on well-documented milestones such as patents and published work.

Inventions That Transformed the Home

The dishwasher: Josephine Cochrane

Josephine Cochrane received a patent in 1886 for a dishwashing machine that used water pressure and wire compartments shaped to hold plates, cups and saucers. Her machines were first popular with hotels and restaurants, and the company she founded eventually became part of a major appliance brand. Today the dishwasher is a fixture in millions of homes.

The coffee filter: Melitta Bentz

In Germany in 1908, Melitta Bentz patented a coffee filter system using paper, after experimenting with blotting paper and a perforated brass pot. Her invention produced coffee without gritty grounds, and the business she started still carries her name.

The hand-cranked ice cream freezer: Nancy Johnson

Nancy Johnson received a United States patent in 1843 for a hand-cranked ice cream freezer. The design made it far easier to churn ice cream at home, and the basic principle of a crank-turned paddle inside a cold container influenced ice cream makers for generations.

Gas central heating: Alice H. Parker

Alice H. Parker, an African American inventor, patented a heating furnace that used natural gas in 1919. Her design included a system for distributing heat through a building and is often cited as an important early step towards modern central heating.

The waterproof nappy cover: Marion Donovan

Marion Donovan patented a waterproof diaper cover in 1951, made from shower curtain material at first. It helped pave the way for the disposable nappies that later became widespread.

Inventions That Changed Travel and Industry

The windscreen wiper: Mary Anderson

On a snowy trip to New York, Mary Anderson noticed drivers struggling to see through their windscreens. She received a patent in 1903 for a hand-operated device that cleared the glass from inside the vehicle. Wipers later became standard equipment on cars around the world.

The flat-bottomed paper bag machine: Margaret Knight

Margaret Knight invented a machine that cut, folded and glued flat-bottomed paper bags, receiving a patent in 1871 after a legal challenge from a man who claimed the idea as his own. Those sturdy, square-bottomed bags are still used in shops today.

Signal flares: Martha Coston

Building on notes left by her late husband, Martha Coston developed a system of coloured signal flares, patented in 1859. Navies and ships used the flares to communicate at night, and the system was adopted by the United States Navy.

Non-reflective glass: Katharine Burr Blodgett

Working at General Electric, physicist Katharine Burr Blodgett developed a method for making non-reflective glass in the late 1930s. Low-reflection coatings became valuable for camera lenses, eyeglasses and many optical instruments.

Kevlar: Stephanie Kwolek

In 1965, chemist Stephanie Kwolek, working at DuPont, discovered a new kind of polymer solution that led to Kevlar, a fibre several times stronger than steel by weight. Kevlar is used in protective vests, helmets, tyres, ropes and sporting goods.

Breakthroughs in Computing and Communication

The first published computer program: Ada Lovelace

In 1843, Ada Lovelace published extensive notes on Charles Babbage’s proposed Analytical Engine. They included a method for calculating Bernoulli numbers, often described as the first published algorithm intended for a machine. She also speculated that such machines might one day work with music and symbols, not just numbers.

The compiler: Grace Hopper

Computer scientist and US Navy officer Grace Hopper developed one of the first compilers, the A-0 system, in the early 1950s. Compilers translate human-readable instructions into machine code. She also played an influential role in the development of COBOL, a business programming language still used in some systems today.

Frequency hopping: Hedy Lamarr

Film star Hedy Lamarr and composer George Antheil received a patent in 1942 for a frequency-hopping system intended to stop radio-guided torpedoes from being jammed. The concept of spread-spectrum communication is often cited as a forerunner of technologies used in modern wireless communications.

The illusion transmitter: Valerie Thomas

NASA scientist Valerie Thomas patented an illusion transmitter in 1980, a system using concave mirrors to create three-dimensional images. Her work contributed to research in imaging technology.

Advances in Medicine and Health

Mobile X-ray units: Marie Curie

Marie Curie, who won Nobel Prizes in both physics and chemistry, also helped develop mobile radiography units during the First World War. These vehicles brought X-ray equipment closer to the front lines, helping doctors locate injuries more quickly.

The laserphaco probe: Patricia Bath

Ophthalmologist Patricia Bath invented the laserphaco probe for cataract treatment and received a patent in 1988. She is widely recognised as the first African American female doctor to receive a medical patent.

Artemisinin: Tu Youyou

Chinese scientist Tu Youyou led research that identified artemisinin, a compound from sweet wormwood used in malaria treatment, in the early 1970s. Her work was recognised with the Nobel Prize in Physiology or Medicine in 2015.

Modified mRNA: Katalin Karikó

Biochemist Katalin Karikó, working with immunologist Drew Weissman, discovered nucleoside base modifications that made mRNA more suitable for use in vaccines. The pair received the Nobel Prize in Physiology or Medicine in 2023 for this work.

Inventions for Work and Play

Correction fluid: Bette Nesmith Graham

Typist Bette Nesmith Graham created a white correction fluid in the 1950s to paint over typing errors. Her product, later sold as Liquid Paper, became an office staple before word processors took over.

The Landlord’s Game: Elizabeth Magie

Elizabeth Magie patented The Landlord’s Game in 1904, a board game designed to show the problems of property monopolies. It is widely regarded as a forerunner of the famous property-trading game Monopoly.

The chocolate chip cookie: Ruth Wakefield

Ruth Wakefield, who ran the Toll House Inn in Massachusetts, is credited with creating the chocolate chip cookie around 1938. Its popularity grew rapidly, and it remains one of the most beloved baked treats in the world.

Lessons From Women Inventors

• Everyday frustrations spark ideas. Dirty dishes, gritty coffee and snowy windscreens all led to lasting inventions.
• Persistence matters. Several inventors fought legal battles or social barriers to have their work recognised.
• Collaboration is common. Many breakthroughs involved partners, teams and shared credit.
• Recognition can come late. Some contributions were only widely celebrated decades later.

Tips for Learning More

• Search national patent office databases to view original patent drawings.
• Visit science museums, which increasingly highlight women in science and engineering.
• Read biographies to understand the challenges inventors faced in their own times.
• Check reputable museum, university or Nobel Prize sources when dates and credits matter.

Final Thoughts

The stories of women inventors remind us that great ideas come from everywhere: kitchens, offices, laboratories, film sets and snowy streets. Their inventions changed history and continue to shape daily life.

Celebrating these pioneers is not just about the past. It helps inspire the next generation of inventors, whoever they are and wherever their ideas begin.