EP0169105A2 — Controlled porosity osmotic pump
Assigned to Merck and Co Inc · Expires 1986-01-22 · 40y expired
What this patent protects
(57) The instant invention is directed to an osmotic pump comprising: (a) at least one active agent surrounded by (b) a water insoluble wall, having a fluid permeability of 6.96 x 10 -18 to 6.96 x 10 -14 cm 3 sec/g and a reflection coefficient of less than 1, prepared fr…
USPTO Abstract
(57) The instant invention is directed to an osmotic pump comprising: (a) at least one active agent surrounded by (b) a water insoluble wall, having a fluid permeability of 6.96 x 10 -18 to 6.96 x 10 -14 cm 3 sec/g and a reflection coefficient of less than 1, prepared from: (i) a polymer permeable to water but impermeable to solute, and (ii) 0.1 to 60% by weight, based on the total weight of (i) and (ii), of at least one pH insensitive pore forming additive dispersed throughout said wall.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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