No 4,690,825, granted Sept. 1, 1987 to Richard Won, {HEAD ~ Method} for Delivering {TAIL ~ an Active Ingredient} by Controlled Time Release Utilizing a Novel Delivery Vehicle which can be Prepared by a Process Utilizing the Active Ingredient as a Porogen 
for Delivering
No 4,690,825 , granted Sept. 1 , 1987 to Richard Won , { HEAD ~ Method } for Delivering { TAIL ~ an Active Ingredient } by Controlled Time Release Utilizing a Novel Delivery Vehicle which can be Prepared by a Process Utilizing the Active Ingredient as a Porogen
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