Anyone who has driven through an Alberta snowfall knows how quickly a clear windshield can disappear behind slush and snow.

Yet one of the people who helped solve that everyday problem wasn’t a car manufacturer or a professional automotive engineer.

She was Mary Anderson, an entrepreneur from Birmingham, Alabama.

An idea sparked by bad weather

During a New York City visit in 1902, Anderson rode a streetcar whose driver struggled to see through the snowy front window.

He sometimes opened the window or stopped to clear the glass himself.

Anderson saw an opportunity: why couldn’t the driver clean the outside of the window without leaving his position?

Back home, she developed a mechanical answer.

A handle, an arm and a rubber blade

Her design connected a lever inside the vehicle to an exterior arm carrying a rubber blade.

Moving the lever swept the blade across the glass, while a spring helped maintain contact with the window.

It wasn’t electric, automatic or rain-sensing.

The driver supplied the movement—but could remain inside while clearing the view.

Anderson filed her application on June 18, 1903.

On November 10 that year, she received U.S. Patent No. 743,801 for a “Window-cleaning device.”

A useful idea that struggled to sell

Getting a patent did not guarantee commercial success.

Anderson tried to interest businesses in her invention, but encountered rejection.

One firm told her it did not see enough commercial value in the device.

Her patent expired in 1920.

By 1922, Cadillac was installing windshield wipers as standard equipment.

Anderson’s contribution eventually received wider recognition: she entered the National Inventors Hall of Fame in 2011.

The woman behind a familiar movement

Today’s powered and intermittent wipers reflect further developments by other inventors.

Anderson’s achievement was an early, effective manually operated design—not every feature of the modern system.

The next time your wipers sweep away an Alberta snow shower, spare a thought for the observant passenger who looked at an inconvenient problem and imagined a better way.

Sources: National Inventors Hall of Fame; Anderson’s invention story; U.S. Patent 743,801.