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    • 2. 发明申请
    • Ordered particle structures and methods of making same
    • 有序粒子结构及其制作方法
    • US20050228075A1
    • 2005-10-13
    • US10878656
    • 2004-06-28
    • Costas GogosMing-Wan YoungRajesh DaveRobert PfefferTheodore DavidsonDavid ToddBainian QianJun Yang
    • Costas GogosMing-Wan YoungRajesh DaveRobert PfefferTheodore DavidsonDavid ToddBainian QianJun Yang
    • C06B21/00C06B45/02C08J3/20C08K7/00C10L5/00D03D23/00
    • C08J3/20C06B21/0025C06B21/0083C06B45/02
    • Techniques and methods of formation of ordered mixtures of particles by “clustering”. Clustering comprises local “structuring” consisting of a large “host” and smaller “guest” particles by various techniques. Small amounts of polymer are coated onto solid particles by various means. In one embodiment, an ordered mixture is created wherein the material that is of lesser quantity is of small particle size (the “B” particles) and the “A” particles are of larger size. The “B” particles are then coated onto a single A particle. By creating this ordered structure, each composite particle has the proper or stoichiometric amount of all ingredients. This dry composite material produced is appropriately used in various applications such as pharmaceutical formulations in the form of tablets, capsules, oral suspensions, inhalant, parenteral formulations and the like; energetics manufacture such as but not limited to explosives, propellants and pyrotechnics; agricultural products including but not limited to fertilizers, herbicides and pesticides; nutritional supplements and the like.
    • 通过“聚类”形成有序粒子混合物的技术和方法。 聚类包括通过各种技术由大型“主机”和较小的“客体”粒子组成的本地“结构化”。 少量聚合物通过各种方式涂覆在固体颗粒上。 在一个实施方案中,产生有序混合物,其中少量的材料具有较小的粒度(“B”颗粒)和“A”颗粒的尺寸较大。 然后将“B”颗粒涂覆到单个A颗粒上。 通过创建这种有序结构,每个复合颗粒具有适当或化学计量的所有成分。 生产的这种干燥复合材料适用于各种应用,例如片剂,胶囊,口服悬浮液,吸入剂,肠胃外制剂等药物制剂; 能源制造,例如但不限于爆炸物,推进剂和烟火; 农产品包括但不限于化肥,除草剂和农药; 营养补品等。
    • 6. 发明授权
    • Polymer coating/encapsulation of nanoparticles using a supercritical antisolvent process
    • 使用超临界反溶剂法制备纳米颗粒的聚合物涂层/包封
    • US07537803B2
    • 2009-05-26
    • US10820091
    • 2004-04-07
    • Yulu WangRobert PfefferRajesh Dave
    • Yulu WangRobert PfefferRajesh Dave
    • B05D7/00C08J7/16B01J19/10B29B9/08
    • A61K9/5153A61K9/5031A61K9/5089A61K9/5192B01J2/006C08J3/212C08K9/08C09D7/40C09D11/52Y02P20/544Y10T428/25Y10T428/2998
    • A process, method and/or system for preparing polymer-coated nanoparticles and/or other ultrafine particles utilizing a supercritical fluid, e.g., supercritical carbon dioxide (SC CO2), as an antisolvent that may be added to a solution of a polymer and an organic solvent in which insoluble nanoparticles or the like are suspended. The coating process occurs when the supercritical fluid (e.g., SC CO2) and the nanoparticle-containing suspension are combined to cause the suspended nanoparticles to precipitate as coated nanoparticles. Processing parameters for optimizing and/or enhancing the efficacy and/or efficiency of the coating process, method and/or system and for controlling the coating and/or agglomeration of coated particles are also described. The process, method and/or system has wide ranging applicability, e.g., for coating and/or encapsulation of pharmaceuticals, cosmetics, food products, chemicals, agrochemicals, pesticides, polymers, coatings, catalysts and the like.
    • 使用超临界流体(例如超临界二氧化碳(SCCO 2))制备聚合物涂覆的纳米颗粒和/或其它超微粒子的方法,方法和/或系统作为可以加入到聚合物溶液中的抗溶剂 其中悬浮有不溶性纳米颗粒等的有机溶剂。 当超临界流体(例如SCCO 2)和含纳米颗粒的悬浮液组合以引起悬浮的纳米颗粒作为包覆的纳米颗粒沉淀时,发生涂覆过程。 还描述了用于优化和/或增强涂覆工艺,方法和/或系统的功效和/或效率以及用于控制涂覆颗粒的涂覆和/或附聚的加工参数。 方法,方法和/或系统具有广泛的适用性,例如用于药物,化妆品,食品,化学品,农业化学品,农药,聚合物,涂料,催化剂等的涂覆和/或包封。
    • 8. 发明申请
    • Manufacture of fine particles and nano particles and coating thereof
    • 制造细颗粒和纳米颗粒及其涂层
    • US20070120281A1
    • 2007-05-31
    • US11594411
    • 2006-11-08
    • Boris KhusidAbhijit GokhaleRajesh DaveRobert Pfeffer
    • Boris KhusidAbhijit GokhaleRajesh DaveRobert Pfeffer
    • B29B9/00
    • B01J2/04B01J2/006B01J3/008
    • An anti-solvent fluid technique is provided that assists in the formation, production and manufacture of fine particles including micro-sized and nanometer-sized particles for a wide variety of bio-medical and pharmaceutical applications. This technique is particularly effective for the manufacturing of polymers/biopolymers/drugs of micron, submicron or nano size as well as particle coating/encapsulation. Co-solvents are used to dissolve the polymer or mixture of polymers to make a solution. The method facilitates rapid drying of precipitated particles with reduced size and agglomerations. The method includes: (1) providing: an anti-solvent fluid; both organic solvents are soluble in the anti-solvent fluid; a second solvent that is at least partially soluble in or miscible with the first solvent; and a solute that is soluble in the first solvent and is substantially insoluble in the second solvent and the anti-solvent fluid; (2) capillary nozzle(s) are used to inject the solution into anti-solvent; (3) contacting the first solvent, the second solvent and the solute together to form a solution; (4) contacting the solution with the anti-solvent fluid to extract both solvents from the solution and precipitate the solute in the form of particles; and (5) contacting the solution with the anti-solvent fluids to extract both solvents from solution and precipitate the solute(s).
    • 提供了一种抗溶剂流体技术,其有助于形成,生产和制造包括用于各种生物医学和药物应用的微尺寸和纳米尺寸颗粒的细颗粒。 该技术对于制备微米,亚微米或纳米尺寸以及颗粒涂层/包封的聚合物/生物聚合物/药物是特别有效的。 共溶剂用于溶解聚合物或聚合物混合物以制成溶液。 该方法有助于快速干燥具有减小的尺寸和聚集的沉淀颗粒。 该方法包括:(1)提供:反溶剂流体; 两种有机溶剂均溶于反溶剂液体; 至少部分可溶于第一溶剂或与第一溶剂混溶的第二溶剂; 以及可溶于第一溶剂且基本上不溶于第二溶剂和反溶剂流体的溶质; (2)毛细喷嘴用于将溶液注入反溶剂中; (3)将第一溶剂,第二溶剂和溶质接触在一起形成溶液; (4)使溶液与反溶剂流体接触,从溶液中提取两种溶剂,并以颗粒形式沉淀溶质; 和(5)使溶液与反溶剂流体接触以从溶液中萃取两种溶剂并沉淀溶质。
    • 9. 发明授权
    • Fractal structured nanoagglomerates as filter media
    • 分形结构纳米粒子作为过滤介质
    • US07645327B2
    • 2010-01-12
    • US11416034
    • 2006-05-02
    • Robert PfefferRajesh DaveStanislav DukhinJose A. QuevedoQun Yu
    • Robert PfefferRajesh DaveStanislav DukhinJose A. QuevedoQun Yu
    • B01D29/02
    • B01D46/30B01D39/04B01D46/003B01D2239/0258B01D2279/51Y10S977/773Y10S977/775Y10S977/776Y10S977/777Y10S977/778
    • Systems and methods for achieving filtration are provided that utilize agglomerates or granules of nanoparticles. The agglomerates or granules of nanoparticles may be used as and/or incorporated into a HEPA filtration system to remove solid or liquid submicron-sized particles, e.g., MPPS, in an efficient and efficacious manner. The filtration systems and methods are provided that utilize agglomerates or granules in a size range of about 100-500 microns. The agglomerates or granules of nanoparticles exhibit a hierarchical fractal structure. In the case of agglomerates of nanoparticles, porosities of 0.9 or greater are generally employed, and for granules of nanoparticles, porosities that are smaller than 0.9 may be employed. Filter media formed from the agglomerates or granules may be formed from materials such as carbon black and fumed silica, and may be employed in baffled or non-baffled filtration apparatus.
    • 提供用于实现过滤的系统和方法,其利用纳米颗粒的附聚物或颗粒。 纳米颗粒的附聚物或颗粒可以用作和/或并入HEPA过滤系统中以有效和有效的方式除去固体或液体亚微米尺寸的颗粒,例如MPPS。 提供了使用约100-500微米尺寸范围内的附聚物或颗粒的过滤系统和方法。 纳米颗粒的团聚体或颗粒呈现分层结构。 在纳米颗粒附聚物的情况下,通常使用0.9或更大的孔隙率,并且对于纳米颗粒的颗粒,可以使用小于0.9的孔隙率。 由附聚物或颗粒形成的过滤介质可以由诸如炭黑和煅制二氧化硅的材料形成,并且可以用于挡板或非挡板过滤装置中。