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The packaging of dry, combined materials for concrete and mortar was initiated in this country about 1936. A trade name was copyrighted. A process for proportioning, mixing, and packaging was developed, but its details were not made public. A considerable part of the specialized equipment used was patented. Licenses to use the process, special equipment, and trade name were issued to a number of companies under an agreement providing for details of packaging and marking, quality control, and similar items. The business grew slowly at first, but quite rapidly since the end of World War II, and quickly attracted the attention of others. Since there were many approaches to proportioning and mixing and since many packaging methods were available, many competitors of the original licensees and many new trade names quickly appeared. Current estimates of the number of producers now operating vary from less than 100 to about 200. Annual production is generally estimated to be more than twenty million packages.
Brust, A. W.
Professor of civil engineering, Washington University, St. Louis, Mo.