Eastman entered a partnership with Henry Strong in 1880 and the Eastman Dry Plate Company was founded on January 1, 1881, with Strong as president and Eastman as treasurer.[27] Initially, the company sold dry plates for cameras, but Eastman's interest turned to replacing glass plates altogether with a new roll film process. On October 1, 1884, the company was re-incorporated as the Eastman Dry Plate and Film Company.[28] In 1885, Eastman patented the first practical film roll holder with William Walker, which would allow dry plate cameras to store multiple exposures in a camera simultaneously.[29] That same year, Eastman patented a form of paper film he called "American film".[30] Eastman would continue experimenting with cameras and hired chemist Henry Reichenbach to improve the film. These experiments would culminate in an 1889 patent for nitrocellulose film.[31] As the company continued to grow, it was re-incorporated several more times. In November 1889, it was renamed the Eastman Company and 10,000 shares of stock were issued for $100.[32] On May 23, 1892, another round of capitalization occurred and it was renamed Eastman Kodak.[4][33] An Eastman Kodak of New Jersey was established in 1901 and existed simultaneously with the Eastman Kodak of New York until 1936, when the New York corporation was dissolved and its assets were transferred to the New Jersey corporation.[34] Kodak remains incorporated in New Jersey today, although its headquarters is in Rochester.