<Li> 1885: George Eastman bought David Houston's patents for roll film and developed them further . These were the basis for the invention of motion picture film, as used by early filmmakers and Thomas Edison . </Li> <Li> September 4, 1888: Eastman registered the trademark Kodak . </Li> <Li> 1888: The first model of the Kodak camera appeared . It took round pictures 6.4 cm (2.5 in) in diameter, was of the fixed focus type, and carried a roll of film enough for 100 exposures . Its invention practically marked the advent of amateur photography, as before that time both apparatus and processes were too burdensome to classify photography as recreation . The roll film used in the first model of the Kodak camera had a paper base but was soon superseded by a film with a cellulose base, a practical transparent flexible film . The first films had to be loaded into the camera and unloaded in the dark room, but the film cartridge system with its protecting strip of opaque paper made it possible to load and unload the camera in ordinary light . The Kodak Developing Machine (1900) and its simplified successor, the Kodak Film Tank, provided the means for daylight development of film, making the dark room unnecessary for any of the operations of amateur photography . The earlier types of the Kodak cameras were of the box form and of fixed focus, and as various sizes were added, devices for focusing the lenses were incorporated . </Li> <Li> 1889: The Eastman Company was formed . </Li>

When did kodak introduce film photography to the commercial market