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| Number | Title | Issue Date |
| 4898737 | Controlled absorption pharmaceutical composition A sustained absorption propranolol-containing pellet for oral administration comprises a core of propranolol or a pharmaceutically acceptable salt thereof and an organic acid embedded in a polymeric material in a multi-layer arrangement and an outer membr... | 02/06/1990 |
| 4894240 | Controlled absorption diltiazem formulation for once-daily administration A diltiazem pellet formulation for oral administration comprises a core of diltiazem or a pharmaceutically acceptable salt thereof in association with an organic acid, and a multi-layer membrane surrounding the core and containing a major proportion of a ... | 01/16/1990 |
