发明名称 |
TWO STEP METHOD FOR PREPARATION OF CONTROLLED RELEASE FORMULATIONS |
摘要 |
Active substances intended for topical application are incorporated in novel formulations in which they are retained as impregnants inside the pores of porous solid particles or microspheres. The pores form a continuous network open to the exterior of the particles, permitting outward diffusion of the impregnants at a controlled rate depending on the pore size. The impregnated particles are prepared by impregnation of preformed particles with the active substance.
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申请公布号 |
US5145675(A) |
申请公布日期 |
1992.09.08 |
申请号 |
US19910644869 |
申请日期 |
1991.01.23 |
申请人 |
ADVANCED POLYMER SYSTEMS, INC. |
发明人 |
WON, RICHARD;KATZ MARTIN;CHENG CHUNG HENG |
分类号 |
A01N25/18;A61K8/04;A61K8/34;A61K8/49;A61K8/67;A61K8/81;A61K9/16;A61Q7/00;A61Q17/00;A61Q17/02 |
主分类号 |
A01N25/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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