James Henry Atkinson (c. 1849–1942) was a British ironmonger from Leeds, Yorkshire who is best known for his 1899 patent of the Little Nipper mousetrap.^[1] He is cited by some as the inventor of the classic spring-loaded mousetrap,^[2][3] but this basic style of mousetrap was patented a few years earlier in the United States by William Chauncey Hooker in 1894.^[4]

Atkinson patented various inventions including a number of mousetrap mechanisms (GB189827488, GB189913277, GB190002503, GB190008317, GB190820769, GB191022542).^[5] The mousetrap patents included a number of variations of the now classic snapping mousetrap consisting of a spring-loaded hinged metal bar mounted on a small flat wooden base. It slams shut in 38/1000^{[citation needed]} of a second, killing the mouse by breaking its spine and causing shock and internal bleeding. Although some of his designs were more sophisticated (for example treadle activated triggers^[6]) it is the simple ‘Little Nipper´ that was the most successful. The spring-on-board mousetrap design has captured a sixty-percent share of the British mousetrap market alone, and an estimated equal share of the international market.^{[citation needed]}

In 1913, James Atkinson sold his mousetrap patent for 1,000 pounds to Procter, the company that has been producing the "Little Nipper" ever since. Additionally, Procter has established a mousetrap museum with 150 exhibits at its factory headquarters.