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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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US Patent 5529791 - Extended release form of diltiazem
US Patent Issued on June 25, 1996
Estimated Patent Expiration Date:
September 23, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 23, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractAn extended-release galenical form of Diltiazem or a pharmaceutically acceptable salt thereof, which comprises beads containing said Diltiazem or a pharmaceutically acceptable salt thereof as an active ingredient and a wetting agent, said beads being coated with a microporous membrane comprising at least a water-soluble or water-dispersible polymer or copolymer and a pharmaceutically acceptable adjuvant. | InventorsAssigneeApplicationNo. 311722 filed on 09/23/1994US Classes:424/494, Cellulose derivatives424/490, Coated (e.g., microcapsules)424/497, Containing solid synthetic polymers514/777, Carbohydrate or lignin, or derivative514/785, Carboxylic acid ester514/786, Glyceride514/970CONTAINING DESIGNATED INGREDIENT TO STABILIZE AN ACTIVE INGREDIENTField of Search424/457, Sustained or differential release424/458, Containing discrete coated particles pellets, granules, or beads424/462, Containing solid synthetic polymers424/490, Coated (e.g., microcapsules)424/493, Containing polysaccharides (e.g., sugars)424/497, Containing solid synthetic polymers424/498, Containing waxes, higher fatty acids, higher fatty alcohols, or derivatives thereof424/499, Contains proteins or derivative or polysaccharides or derivative424/494Cellulose derivativesExaminersPrimary: Page, Thurman K.Assistant: Spear, James M. Attorney, Agent or FirmUS Patent References5112621, Sustained release pharmaceutical composition of diltiazemIssued on: 05/12/1992 Inventor: Stevens, et al.5275824Therapeutic compositions with controlled release of medicaments supported on crosslinked polymers and coated with polymer films, and their preparation process Issued on: 01/04/1994 Inventor: Carli, et al. International ClassesA61K 009/16A61K 009/58 A61K 009/62 |
