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