Universally useable tableting ingredients
Patent 4013820 Issued on March 22, 1977. Estimated Expiration Date: 
March 22, 1994. Estimated 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.
March 22, 1994. Estimated 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.Patent References 2093463 2768161 2809191 2852508 2865898 3080294 3424842 InventorsAssigneeApplicationNo. 05/521989 filed on 11/07/1974US Classes:536/64, Mixed carboxylate esters424/468, Sustained or differential release type424/494, Cellulose derivatives424/497, Containing solid synthetic polymers514/964, SUSTAINED OR DIFFERENTIAL RELEASE TYPE526/318.4, With ester monomer526/327, Derived from an ethylenically unsaturated carboxylic acid and an ethylenically unsaturated alcohol526/936, PHYSIOLOGICAL USE, E.G., PHARMACEUTICAL, VETERINARY, DENTAL, ETC.528/496, Contains one to four carbon atoms536/3, Algin or derivative536/66Ether-estersExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmAbstractKnown polymers of a defined class are converted into a universally useable tableting ingredient that provides controlled release of a drug from tablets made with this material. The new material is made in a rapidly stirred, nonaqueous solvent in a one-step process.Other References
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