Which inventor is credited with the first practical hand-cranked ice-cream freezer?

Nancy Johnson is credited with inventing the first practical hand-cranked ice-cream freezer.

She patented the device in the United States in 1843. Her design used a dasher inside a freezing canister, with a hand crank turning the dasher while the container sat in a mixture of ice and salt. The movement helped keep large ice crystals from forming and made homemade ice cream smoother.

Johnson sold the patent rights, and the design was later reproduced and improved by manufacturers. Earlier methods existed, but they were generally more laborious and less convenient. The hand-cranked freezer made ice cream practical for more households before electric refrigeration became common.

The invention did not create ice cream itself. Frozen milk desserts had much older histories in Europe and Asia. Johnson’s importance lies in making the freezing and stirring process efficient enough for widespread domestic use.