Controlled-release composition having a membrane comprising submicron particles
Patent 4756844 Issued on July 12, 1988. Estimated Expiration Date: 
December 29, 2006. 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.
December 29, 2006. 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 ReferencesInventorsApplicationNo. 06/947111 filed on 12/29/1986US Classes:510/302, With oxygen or halogen containing chemical bleach or oxidant component252/186.26, Organic peroxide252/186.29, With organic material252/186.32, Contains Group IA metal peroxide252/186.34, Contains organohalogen compound as oxidant252/186.36, Contains free halogen or oxy-halogen acid type252/186.37, Contains alkaline earth metal252/187.28, Calcium427/213.3, Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)427/213.36, Solid-walled microcapsule formed from preformed synthetic polymer428/402.21, Solid-walled microcapsule from synthetic polymer428/402.22, Addition polymer from unsaturated monomers only428/402.24, Microcapsule with solid core (includes liposome)510/108, CLEANING COMPOSITIONS OR PROCESSES OF PREPARING (E.G., SODIUM BISULFATE COMPONENT, ETC.)510/305, Enzyme component of specific activity or source (e.g., lipase, of bacterial origin, etc.)510/306, Proteolytic enzyme510/307, With oxygen, nitrogen, or sulfur containing optical brightener510/308, With oxygen, nitrogen, or sulfur containing textile softening or antistatic component510/309, Peroxy component510/310, Percarboxylic acid component, or salt thereof510/442, Aqueous coating agent510/488Carboxylic acid, or salt thereofExaminersPrimary: Willis, Prince E.Attorney, Agent or FirmInternational ClassesA01N 25/26 (20060101)C09B 67/08 (20060101) C11D 17/04 (20060101) C11D 17/00 (20060101) C09B 67/00 (20060101) C09B 67/02 (20060101) AbstractNovel controlled-release compositions are disclosed. These compositions comprise: (1) an agent suitable for use in a selected environment; and (2) a membrane surrounding this agent. The membrane is substantially inert to the agent and permeable to the environment, its thickness and permeability comprising a means for controlling diffusion of the environment therethrough. The membrane thickness is substantially uniform due to the presence of a quantity of submicron particles therein, these particles being substantially inert to the membrane and the agent. The membrane comprising the submicron particles is capable of releasing the agent to the selected environment at a predetermined time by a variety of mechanisms. The release mechanisms that may be selected for use with a composition will depend in part on the choices of agent, membrane, and submicron particle materials, as well as on the choice of environment into which the composition is to be introduced. | |
