which owned a network of crude oil pipelines in the midwestern United States. In 1925, it bought a stake in the Pan American Petroleum and Transport Company (PAT). The acquired company had previously bought a half interest in the American Oil Company, which marketed half of PAT's oil in the United States. Indiana Standard raised its stake in PAT to 81 percent by 1929. In 1931, Stanolind completed its acquisition of Sinclair Pipeline and also acquired the Sinclair Crude Oil Purchasing Company. All of the pipeline companies were consolidated into the newly formed Stanolind Pipeline Company. The crude oil purchasing operations became Stanolind Crude Oil Purchasing Company. The pipeline company headquarters were located in the Philcade building in Tulsa, Oklahoma.