A. & E. Plastik Pak Co. v. Monsanto

Until December 3, 1963, Monsanto held a patent on an extremely clear, durable type of plastic sheet known as "biaxially oriented polystyrene sheet" and, in the trade, called "OPS". It remains the major U.S. supplier of this sheet. Soon after the expiration of its patent, A.& E., a producer of finished products from this type of plastic sheet, began attempts to develop a plant to make OPS for itself, using information disclosed by the patent.