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A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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US Patent 5395628 - Controlled release succinic acid microcapsules coated with aqueous acrylics
US Patent Issued on March 7, 1995
Estimated Patent Expiration Date:
April 13, 2012Estimated 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:
April 13, 2012Estimated 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.AbstractA controlled release pharmaceutical preparation comprising (a) a core containing a pharmaceutically active substance and an organic acid, and (b) a coating film formed on the surface of the core by aqueous coating of a water-insoluble and water-slightly permeable acrylic polymer containing a trimethylammonium-ethyl group, which exhibits well controlled dissolution and release of the pharmaceutically active substance when administered and can maintain the desired blood level of the active substance for a long period of time, and a method for producing the preparation.Other References
| InventorsAssigneeApplicationNo. 870195 filed on 04/13/1992US Classes:424/490, Coated (e.g., microcapsules)424/468, Sustained or differential release type424/474, Coated pills or tablets424/487Acrylic acid and derivativesField of Search424/464, Tablets, lozenges, or pills424/465, With claimed perfecting feature in contents (e.g., excipient, lubricant, etc.)424/468, Sustained or differential release type424/477, Containing proteins or derivatives thereof424/482, Containing solid synthetic polymers424/490Coated (e.g., microcapsules)ExaminersPrimary: Page, Thurman K.Assistant: Levy, Neil S. Attorney, Agent or FirmUS Patent References4427648, Dipyridamole-containing pharmaceutical formIssued on: 01/24/1984 Inventor: Brickl , et al.4737357, Aqueous coating dispersions Issued on: 04/12/1988 Inventor: Lehmann , et al.4820521, Sustained absorption pharmaceutical composition Issued on: 04/11/1989 Inventor: Panoz , et al.4940588Controlled release powder and process for its preparation Issued on: 07/10/1990 Inventor: Sparks, et al. Foreign Patent References
International ClassA61K 009/50Foreign Application Priority Data1989-12-28 JP |
