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