Sakizō Yai
Japanese inventor of a dry cell battery and electric clock.
Sakizō Yai was born on January 13, 1864, into a samurai family of high standing in the Nagaoka Domain (now Nagaoka, Niigata Prefecture). The Yai household had held over 300 koku for generations, but when Yai was six, his father died and the family went bankrupt. He was then raised by his mother and uncle.
At age 21, in 1885, Yai created a continuous electric clock that ran directly on a wet-cell battery he had built. While other electric clocks existed, they relied on conventional spring-driven movements that used electricity only to wind the spring. Yai’s design was a major step forward, and in 1891 it became his first electric patent in Japan—though earlier electric patents had already been granted since Japan's patent system began in 1885.
In 1887, Yai succeeded in inventing a dry cell battery. However, he could not afford the patent application fee, so the first Japanese patent for a dry battery went to electrician Ichisaburo Takahashi. Meanwhile, Carl Gassner had patented a dry cell in Germany in 1886, and Frederik Louis Hellesen had done the same in Denmark in 1887.
In 1893, a seismograph from Tokyo Imperial University was displayed at the World’s Columbian Exposition. The stored-charge batteries used in that device amazed visitors.
Yai died suddenly on June 1, 1927, at age 63, from acute pneumonia while suffering from gastric cancer. He is remembered as a Japanese businessman and inventor.
- known_for
- Inventing a type of dry cell battery; early electric patent in Japan
Quick Facts
- Birth Date
- 1864-01-13
- Birth Place
- Nagaoka Domain, Echigo Province, Japan
- Death Date
- 1927-06-01
- Occupation
- Businessman
- Known For
- Inventing dry cell battery
Facts from the source article.
Lore & Background
Sakizō Yai was born on January 13, 1864, to a samurai family in the Nagaoka Domain (now Nagaoka, Niigata Prefecture). The Yai family held a property of more than 300 koku for generations, but when Yai was six years old his father died and the house went bankrupt. After this, his mother and his uncle took him over. In 1885, at age 21, Yai invented a continuous electric clock powered by wet-cell batteries. While earlier electric clocks used electricity only to wind a spring, Yai's clock was powered directly by a battery he had made. This clock earned him an electric patent in Japan in 1891—though earlier electric patents had already been granted since Japan's patent system began in 1885. In 1887, Yai invented a dry cell electric battery, but could not immediately apply for a patent because he could not pay the application fee. The patent for the first dry battery in Japan was obtained by electrician Ichisaburo Takahashi. Carl Gassner patented the dry cell battery in Germany in 1886, and Frederik Louis Hellesen patented it in Denmark in 1887. In 1893, the Tokyo Imperial University's seismograph was exhibited at the 1893 World's Columbian Exposition, and the stored-charge batteries used in it surprised visitors. Yai suffered from gastric cancer and died suddenly of acute pneumonia on June 1, 1927, at age 63.
Reader's Guide
Sakizō Yai's significance lies in his early contributions to battery technology and electric timekeeping. His invention of a continuous electric clock in 1885, powered directly by a wet-cell battery, marked a departure from conventional spring-driven designs and earned Japan's first electric patent in 1891. His subsequent development of a dry cell battery in 1887, though unpatented due to financial constraints, placed him among the early innovators in portable power sources. While others—such as Carl Gassner in Germany and Ichisaburo Takahashi in Japan—secured patents for dry cells, Yai's work demonstrated independent technical achievement. The use of stored-charge batteries in the Tokyo Imperial University's seismograph at the 1893 World's Columbian Exposition further highlights the practical application of such technology. Yai's legacy is that of a pioneer whose inventions, though overshadowed by patent disputes, contributed to the foundation of Japan's electrical industry.
Did You Know?
- Yai's continuous electric clock earned him an electric patent in Japan in 1891, though earlier electric patents existed since Japan's patent system began in 1885.
- He invented a dry cell battery in 1887 but could not afford the patent application fee.
- The patent for the first dry battery in Japan was obtained by Ichisaburo Takahashi.
- Carl Gassner patented the dry cell in Germany in 1886, and Frederik Louis Hellesen patented it in Denmark in 1887.
- Yai died suddenly of acute pneumonia on June 1, 1927, while suffering from gastric cancer.
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