UN PROCEDIMIENTO PARA LA PRODUCCION DE UN DISPOSITIVO PARA LIBERAR AGENTE ACTIVO A UN MEDIO ACUOSO, CONTINUA Y SOSTENI-DAMENTE.

摘要

1425550 Fertilizer composition ALZA CORP 9 April 1974 [25 April 1973] 15673/74 Heading C1B [Also in Division A5] Monobasic ammonium phosphate is ground to an average particle size of 40 microns and mixed with plasticized polyvinylchloride extruded through a die to form a continous rod which is coated with an impermeable coating and chopped into pieces which are capable of imbibing water through the cut ends and gradually releasing fertilizer over a period of hours (Example 7).