Eastman Kodak Co., a vanguard name in photography, finally filed for Chapter 11 bankruptcy Thursday following falling sales and rising speculation about its ability to stay afloat. The long-anticipated announcement came after weeks of early eulogies about the faded glory of the former trailblazer, once an American mainstay with products such Kodachrome photographic film and Instamatic cameras. But printed photos seem well on their way to becoming a hipster curiosity as digital technologies -- which originated at Kodak decades ago -- now dominate on smartphones and, to a shrinking degree, cameras. The company, which was also exposed to heavy foreign...