Joseph Bancroft & Sons Company began operation in 1831 as a cotton cloth manufacturer in Rockford, Delaware. After the Civil War, the company concentrated on finishing cotton cloth. In later years it became famous for its Ban-lon artificial fiber but eventually withdrew from manufacturing in favor of licensing its processes and trademarks to other companies. The records consist of miscellaneous correspondence and reports, possibly from W. Ralph MacIntyre (1897-1984), president. The records include research reports and notebooks on dyeing, bleaching, printing, and finishing of fabrics.

Joseph Bancroft & Sons Company began operation in 1831 as a cotton cloth manufacturer in Rockford, Delaware. After the American Civil War, the company concentrated on finishing cotton cloth, purchasing the Kentmere Mills adjoining their original site in 1895 and a third plant for manufacturing at Reading, Pennsylvania, in 1910. The company acquired another textile firm, the Eddystone Manufacturing Company, in 1925. This collection comprises records from both the Joseph Bancroft & Sons Company and the Eddystone Manufacturing Company, along with records from several predecessors and subsidiaries. The Joseph Bancroft & Sons Company records trace the firm's history from 1831 through 1961, with the Managing Director's letter books, in particular, giving a very detailed picture of the company's operations. The records of the Eddystone Manufacturing Company and its predecessors are relatively complete and offer a good picture of a medium-sized textile firm that was typical of the mid-Atlantic states.

The Joseph Bancroft & Sons Company operated cotton textile mills in Wilmington, Delaware, where they manufactured, bleached, dyed, and finished a variety of cotton-made goods. The Pusey & Jones Corporation were shipbuilders, founders, and machinists of Wilmington, Delaware, which later expanded into papermaking machinery manufacturing. This collection consists of eleven small notebooks from the two companies regarding their work.