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