Eastman Patents Film: Photography Goes Portable

George Eastman received U.S. patent number 306,594 on October 14, 1884, for a new type of photographic film that replaced the heavy, fragile glass plates photographers had been lugging around since the 1850s. His paper-strip film was lighter, flexible, and could be loaded in rolls — an invention that would democratize photography and eventually make possible the motion picture industry. Before Eastman's innovation, photography was an expensive, cumbersome process practiced almost exclusively by professionals and wealthy amateurs. Glass plate negatives required portable darkrooms for field work, and the wet collodion process demanded that plates be coated, exposed, and developed within minutes. A photographer heading out for a day's work might carry hundreds of pounds of equipment. Eastman, a bank clerk from Rochester, New York, who had taken up photography as a hobby, became obsessed with simplifying the process. His paper film worked by coating a strip of paper with a light-sensitive gelatin emulsion. After exposure and development, the paper backing was stripped away, leaving a thin negative. The technology was imperfect — paper grain sometimes showed through the emulsion — and Eastman would later switch to a transparent celluloid base that proved far superior. But the fundamental concept of flexible roll film was the breakthrough. Eastman followed the patent with the invention that truly changed everything: the Kodak camera, introduced in 1888. Preloaded with a 100-exposure roll of film, the simple box camera was sold with the slogan "You press the button, we do the rest." Customers mailed the entire camera back to Rochester, where the film was developed and the camera reloaded. Photography was no longer an expert's pursuit — anyone could take a picture. Eastman built the Kodak company into an industrial giant, and his roll film format became the foundation for Thomas Edison's movie camera, the Lumière brothers' cinematograph, and the entire global film industry.