Source: http://www.google.es/patents/US7423090
Timestamp: 2013-12-12 19:03:18
Document Index: 224246605

Matched Legal Cases: ['Application No. 60', 'Application No. 11', 'Application No. 11', 'Application No. 11', 'Application No. 11', 'Application No. 11', 'Application No. 11']

Patente US7423090 - Methods of making and using a superabsorbent polymer product including a ... - Google PatentesB�squeda Im�genes Maps Play YouTube Noticias Gmail Drive M�s » B�squeda avanzada de patentes | Iniciar sesi�n B�squeda avanzada de patentesPatentesA method of and a product formed by entrapping a bioactive, growth-promoting additive in a starch matrix to form a starch-based, superabsorbent polymer product for use in agricultural applications involves (1) graft polymerizing a monomer and a starch to form a starch graft copolymer including a starch...http://www.google.es/patents/US7423090?utm_source=gb-gplus-sharePatente US7423090 - Methods of making and using a superabsorbent polymer product including a bioactive, growth-promoting additive N�mero de publicaci�nUS7423090 B2Tipo de publicaci�nConcesi�n N�mero de solicitudUS 11/013,664 Fecha de publicaci�n9 Sep 2008 Fecha de presentaci�n15 Dic 2004 Fecha de prioridad15 Dic 2003TarifaPagadasTambi�n publicado comoCA2549200A1, CA2549200C, CN1906243A, CN100528951C, EP1737907A1, EP1737907A4, US20050159315, WO2005059023A1 N�mero de publicaci�n013664, 11013664, US 7423090 B2, US 7423090B2, US-B2-7423090, US7423090 B2, US7423090B2 InventoresWilliam McKee Doane, Steven William Doane, Milan H. Savich Cesionario originalAbsorbent Technologies, Inc.Exportar citaBiBTeX, EndNote, RefManCitas de patentes (51), Otras citas (15), Clasificaciones (27), Eventos legales (3) Enlaces externos: USPTO, Cesi�n de USPTO, EspacenetMethods of making and using a superabsorbent polymer product including a bioactive, growth-promoting additiveUS 7423090 B2 Resumen A method of and a product formed by entrapping a bioactive, growth-promoting additive in a starch matrix to form a starch-based, superabsorbent polymer product for use in agricultural applications involves (1) graft polymerizing a monomer and a starch to form a starch graft copolymer including a starch matrix; (2) isolating the starch graft copolymer; (3) forming particles of starch graft copolymer; and (4) adding a bioactive, growth-promoting additive such that at least some of the bioactive, growth-promoting additive is entrapped by the starch matrix. Following placement of the starch-based SAP including a bioactive, growth-promoting additive in proximity to a plant, root, seed, or seedling, growth of the plant, root, seed, or seedling is promoted because availability of beneficial nutrients is increased.
wherein forming particles of superabsorbent polymer product comprises forcing the starch graft copolymer into strands through a die plate having holes disposed therein with a diameter of between about 1/16 inch to � inch, applying an alcohol to the strands to reduce tackiness of the strands of the starch graft copolymers, the alcohol chosen from methanol, ethanol, propanol or isopropanol, the strands subsequently being granularized to form granular, non-powder starch graft copolymer particles sized between about 8 and 25 mesh isolated through screening.
33. The method of claim 1, wherein extruding the starch graft copolymers into strands comprises extruding the starch graft copolymers into strands having a diameter of between about 1/16 inch to � inch.
34. The method of claim 25, wherein extruding the neutralized mixture into strands comprises extruding the cross-linked starch graft copolymers into strands having a diameter of between about 1/16 inch to � inch. Descripci�n
RELATED APPLICATION This application claims the benefit under 35 U.S.C. �119(e) of U.S. Provisional Patent Application No. 60/529,949, filed Dec. 15, 2003.
TECHNICAL FIELD The present invention relates to agricultural amendments, and more particularly to methods of making and using a superabsorbent polymer product including a bioactive, growth-promoting additive.
BACKGROUND INFORMATION Over the past three decades, polymer chemists and soil scientists have developed controlled-release pesticides for agricultural use. The two primary goals of controlled-release pesticides are (1) to increase efficacy of the pesticide and (2) to reduce negative environmental consequences of pesticide application. Some prior art controlled-release pesticides have been encapsulated in starch. These prior art starch-encapsulated controlled-release pesticide products are typically formed by mixing starch and pesticides and forming balls of the mixture. These starch-encapsulated pesticides provide rate-limited release of the pesticide particles from the starch, which release is governed largely by diffusion. Specifically, when starch-encapsulated pesticides are applied to the soil, they imbibe water and swell such that the pesticide particles diffuse out of the starch matrix into the soil surrounding a plant, root, seed, or seedling.
One type of SAPs, called �totally synthetic copolymers,� is made by copolymerizing acrylic acid and acrylamide in the presence of a coupling agent. Almost all totally synthetic copolymer SAPs are used in baby diapers, adult diapers, catamenials, hospital bed pads, cable coating, and the like. Today the worldwide market for totally synthetic copolymer SAPs is estimated to be about 2 billion pounds per year.
SUMMARY One object of the present invention is to formulate a method of producing and using in agricultural applications a starch-based SAP product that includes a bioactive, growth-promoting additive. Application of the resulting SAP product promotes growth of a plant, root, seedling, or seed placed in proximity to the SAP product.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The present invention generally relates to methods of and products formed by entrapping a bioactive, growth-promoting additive in a starch matrix to form a starch-based SAP product for use in agricultural applications. When applied to a growing substrate in proximity to a plant, root, seed, or seedling, or directly to a plant, root, seed, or seedling, the starch-based SAP product including a bioactive, growth-promoting additive promotes growth of a plant, root, seed, or seedling placed in proximity to the SAP product by promoting the availability of beneficial nutrients to the plant, root, seed, or seedling. The high absorptivity of the starch matrix of the starch-based SAP product facilitates entrapment of the bioactive, growth-promoting additive in the starch matrix, thereby minimizing or eliminating disassociation or release of the bioactive, growth-promoting additive from the starch matrix due to heavy rainfall, squeezing, or jarring of the SAP product during transport or manufacture, and during application of the SAP product. Because the bioactive, growth-promoting additive is entrapped in the SAP product, the runoff rate of the growth-promoting additive is significantly less than the runoff rate of growth-promoting additives applied directly to soil, plants, roots, seedlings, or seeds.
The terms �entrapped� and �encapsulated� as used herein are meant to refer to the fact that the bioactive, growth-promoting additive is physically held by the starch matrix portion of the SAP product. The term �bioactive, growth-promoting additive� is meant to include any additive that promotes plant, root, seedling, or seed growth. Indications of promotion of growth include, but are not limited to, earlier seed germination and/or blooming, decreased irrigation requirements, increased propagation, increased crop growth, increased crop production, increased plant size, increased crop yield, and decreased soil crusting
A list of exemplary pesticides includes acaricides, algicides, antifeedants, avicides, bactericides, bird repellents, chemosterilants, fungicides, herbicide safeners, herbicides, insect attractants, insect repellents, insecticides, mammal repellents, mating disruptors, molluscicides, nematicides, plant activators, plant-growth regulators, rodenticides, synergists, virucides, derivatives thereof, blends thereof, and combinations thereof. Three exemplary commercially available pesticides are as follows: Asset�, manufactured by Helena Chemicals of Fairfax, S.C.; ACA�, manufactured by UAP of Greeley, Colo.; and Miracle-Gro�, manufactured by the Scotts Company of Marysville, Ohio.
A list of exemplary preferred herbicides is as follows: amide herbicides including chloroacetanilide herbicides (such as alachlor and metolachlor); antibiotic herbicides; aromatic acid herbicides including benzoic acid herbicides (such as chloramben and dicamba), phthalic acid herbicides, picolinic acid herbicides, and quinolinecarboxylic acid herbicides; arsenical herbicides; benzoylcyclohexanedione herbicides; benzofuranyl alkylsulfonate herbicides; carbamate herbicides; carbanilate herbicides; cyclohexene oxime herbicides; cyclopropylisoxazole herbicides; dicarboximide herbicides; dinitroaniline herbicides (such as trifluralin and pendimethalin); dinitrophenol herbicides; diphenyl ether herbicides; dithiocarbamate herbicides; halogenated aliphatic herbicides; imidazolinone herbicides; inorganic herbicides; nitrile herbicides; organophosphorus herbicides; phenoxy herbicides (such as 2-4D (also called 2,4-dichlorophenoxy acetic acid) and Mecoprop); phenylenediamine herbicides; pyrazolyloxyacetophenone herbicides; pyrazolylphenyl herbicides; pyridazine herbicides; pyridazinone herbicides (such as Norflurazon�); pyridine herbicides; pyrimidinediamine herbicides; quaternary ammonium herbicides; thiocarbamate herbicides (including butylate and EPTC); thiocarbonate herbicides; thiourea herbicides; triazine herbicides (such as atrazine and simazine); triazinone herbicides (such as Metribuzin�); triazole herbicides; triazolone herbicides; triazolopyrimidine herbicides; uracil herbicides; urea herbicides; Roundup� (manufactured by Monsanto Co. of St. Louis, Mo.); Chloropropham�; Surflan� (manufactured by Southern Agricultural Insecticides, Inc. of Palmetto, Fla.); and Clomazone�. A combination or blend of these herbicides may be used.
Exemplary microbial pesticides include bacillus thuringiensis and mycorrhizal fungi. Exemplary insecticides include thiodan, diazinon, and malathion. Exemplary fungicides include Aliette� (active ingredient=aluminum tris (o-ethylphosphenate)) manufactured by Bayer Crop Science of Research Triangle Park, N.C.; Rovral� (active ingredient=iprodione) manufactured by Bayer Crop Science of Research Triangle Park, N.C.; Mancozeb�; Sovran� (active ingredient=kresoxim-methyl) manufactured by BASF Agolutions of Canada; Flint� (active ingredient=trifloxystrobin) manufactured by Novartis Corporation; Ridomil� (active ingredient=Mefenoxam) and Ridomil Gold� (active ingredient methoxyacetylamino-�-2-2[2,6-dimethylphenyl-propionic acid methyl ester] manufactured by Syngenta Crop Protection Inc. of Greensboro, N.C.; Dividend� (active ingredient=difenoconazole) manufactured by Syngenta Crop Protection Inc. of Greensboro, N.C.; SoilGard� (active ingredient=gliocladium virens) manufactured by Certis USA of Columbia, Md.; Bravo� (active ingredient=chlorothalonil) manufactured by Syngenta Crop Protection Inc. of Greensboro, N.C.; Vitavax� (active ingredient=carboxin) manufactured by Gustafson LLC of Canada; Thiram� (active ingredient=tetramethylthiuram disulfide) manufactured by Gustafson LLC of Canada; Maxim� (active ingredient=fludioxonil) manufactured by Syngenta Crop Protection Inc. of Greensboro, N.C.; Quadris� (active ingredient=azoxystrobin) manufactured by Syngenta Crop Protection Inc. of Greensboro, N.C.; and Elite� (active ingredient=tebuconazole) manufactured by Bayer Crop Science of Research Triangle Park, N.C. A combination or blend of these may be used.
Exemplary starches for use in connection with the above-identified methods include pure starches, flours, and meals. Preferred starches include cornstarch, corn meal, wheat starch, sorghum starch, tapioca starch, cereal flours and meals, banana flour, yucca flour, peeled yucca root, unpeeled yucca root, oat flour, banana flour, and tapioca flour. Combinations, derivatives, and blends of these starches may also be used. These starch sources are preferably gelatinized to optimize absorbency. Exemplary commercially available starches include native starches (e.g., corn starch (e.g., Pure Food Powder�, manufactured by A.E. Staley), waxy maize starch (e.g., Waxy� 7350, manufactured by A.E. Staley), wheat starch (e.g., Midsol� 50, manufactured by Midwest Grain Products), and potato starch (e.g., Avebe�, manufactured by A.E. Staley)), dextrin starches (e.g., Stadex� 9, manufactured by A.E. Staley), dextran starches (e.g., Grade 2P, manufactured by Pharmachem Corp.), corn meal, peeled yucca root, unpeeled yucca root, oat flour, banana flour, tapioca flour, and industrial-grade unmodified cornstarch. A preferred molar ratio of the starch to the monomer is between about 1:1 and about 1:6.
As mentioned above, various preferred isolation methods can be used in connection with the present invention. Isolation can occur by precipitation or by drying and/or manipulation of the SAP dough. Precipitation can be used to form particles, granules, powders, strands, rods, films, and the like, all of which are referred to herein as �particles.� Some preferred precipitation methods involve adding a water-miscible solvent such as, for example, an alcohol, e.g., methanol, ethanol, propanol, or isopropanol. One preferred method of alcohol-based precipitation involves immersing the starch graft copolymer in alcohol, thereby causing the starch graft copolymer to precipitate into particles that are later screened to the desired size after drying. The alcohol removes the water from, removes extraneous salts from, and granularizes the starch graft copolymer.
A third preferred method of alcohol-based precipitation involves wetting the surface of the saponificate or neutralized starch graft copolymer with a small amount of alcohol and then chopping the starch graft copolymer into larger �chunks� that will not re-adhere to one another. Once the surface of the saponificate or neutralized starch graft copolymer has been wetted with alcohol, the resulting material is slippery to the touch and is no longer sticky. This effect may be achieved, for example, by using a compositional ratio of between about one part and about two parts of methanol per one part of solid. Once the alcohol has been added, the saponificate or neutralized starch graft copolymer is either (1) pumped through an in-line chopper to form chunks having a diameter of less than one inch or (2) hand-chopped with scissors. The resulting mixture is then fed into a tank or Waring blender that has between about 1.5 gallons and about 2.0 gallons of additional alcohol per pound of starch graft copolymer. The alcohol in the larger tank is agitated with a Cowles dissolver or other mixer capable of achieving high speeds.
A fourth preferred method of alcohol-based precipitation involves pre-forming the particle size before the alcohol-based precipitation. The use of dies to form strands or rods having different shapes and diameters can greatly improve the particle-size formation process. This fourth method offers enhanced control of the final particle size. The starch graft copolymer (neutralized or unneutralized) is forced through a die plate having holes of varying diameter (e.g., about 1/16 inch to more than � inch) and varying shape (e.g., round, star, ribbon, etc.). Methods of forcing the starch graft copolymer through the die plate include using a hand-operated plunger, screw-feeding, auguring, pumping, and any other commonly known method. The resulting strands or rods are placed into the precipitation tank without any further addition of alcohol as a premixing agent. The strands or rods may be treated to prevent them from sticking together, by, for example, wetting the strands or rods with alcohol or dusting them with a dusting agent, such as, for example, cellulose, clay, starch, flour, or other natural or synthetic polymers. Alternatively, the strands or rods may be lightly sprayed with alcohol to prevent them from sticking together. The resulting strands or rods are precipitated with agitated alcohol, removed from the tank, and dried.
EXAMPLE 1 Spray Application of Asset� Pesticide to SAP Particles Distilled water (1,400 ml) was placed in a 3-liter resin kettle and was subjected to constant agitation with a stirrer. Starch flour or meal (110 g) was slowly added to the kettle, and the resulting mixture was stirred for approximately five minutes. A slow stream of nitrogen gas was added to the mixture while the mixture was heated until it reached a temperature of approximately 95� C. Upon reaching this temperature, the mixture was maintained at this temperature and stirred for approximately 45 minutes to ensure that the starch was gelatinized. The heating mantle was then removed, and the resin kettle was placed in a cold-water bucket bath. The mixture was continuously stirred under nitrogen until the temperature reached 25� C. Acrylonitrile (115 g) and 2-acrylamido-2-methyl-propanesulfonic acid (23 g) were added. The resulting mixture was continuously stirred under nitrogen for approximately 10 minutes. A catalyst solution including cerium ammonium nitrate (5.5 g) dissolved in 0.1 M nitric acid solution (50 ml) was added to the mixture while the mixture cooled. The mixture was continuously stirred under nitrogen while the resin kettle remained in the cold-water bucket for approximately 60 minutes. The temperature of the mixture at the end of the 60 minutes was approximately 40� C. A solution including potassium hydroxide flakes (90 g) dissolved in water (200 g) was added to the mixture during stirring and heating. The mixture was stirred and heated until a temperature of 95� C. was achieved, after which the mixture was stirred for an additional 60 minutes. The mixture was then neutralized to a pH of 7.5 using a 10% solution of hydrochloric acid. The resulting dough was then cooled to a temperature of about 40� C. The viscous dough was precipitated in methanol using one of the above-described precipitation methods to produce SAP particles.
TABLE I Fertilizer Analysis of an SAP Product Without an Additive. Nutrient % Available Nitrogen 3.04 Ammonia <0.01 Phosphorus <0.10 P2O5 N/A Potassium 17.66 K2O 21.28 Calcium <0.01 Magnesium <0.01 Sodium 0.08 Boron <20.0 Iron 39.96 Manganese <10.0 Copper <10.0 Zinc <10.0 Monoammonium Phosphate N/A Trial A: Application of Asset� Pesticide at a Concentration of 3 Pints/Acre
Using a standard, commercially available garden sprayer, approximately 3 pints of Asset� was sprayed onto 10 lbs. of SAP product having a mesh size of between about 10 and about 20 and formed using the above-described method. The SAP particles were agitated during application of the Asset� pesticide, to ensure that the bioactive, growth-promoting additive thoroughly coated the SAP particles. Asset� pesticide has a slight green tint, and thus the application of Asset� pesticide to the SAP particles resulted in their being slightly tinted green. The resulting starch-based SAP particles were subjected to a Fertilizer Analysis Test that analyzed the presence of various bioactive components. The results are reproduced in Table II.
TABLE II Fertilizer Analysis of the SAP Product Formed in Trial A. Nutrient % Available Nitrogen 3.85 Ammonia 0.13 Phosphorus 2.61 P2O5 5.97 Potassium 16.06 K2O 19.35 Calcium <0.01 Magnesium <0.01 Sodium 0.13 Boron 74.08 Iron 288.93 Manganese 165.65 Copper 151.97 Zinc 160.67 Monoammonium Phosphate 1.07 Trial B: Application of Asset� Pesticide at a Concentration of 8 Pints/Acre
Using a standard, commercially available garden sprayer, approximately 8 pints of Asset� pesticide was sprayed onto 10 lbs of SAP product having a mesh size of between about 10 and about 20 and formed using the above-described method. The SAP particles were agitated during application of the Asset� pesticide, to ensure that the bioactive, growth-promoting additive thoroughly coated the SAP particles. Asset� pesticide has a slightly green tint, and thus the application of Asset� pesticide to the SAP particles resulted in their being slightly tinted green. The resulting starch-based SAP particles were subjected to a Fertilizer Analysis Test that analyzed the presence of various bioactive components. The results are reproduced in Table III.
Citas de patentes Patente citada Fecha de presentaci�n Fecha de publicaci�n Solicitante T�tuloUS324450025 Jul 19635 Abr 1966Tennessee Valley AuthorityIncorporation of micronutrients in fertilizersUS39350993 Abr 197427 Ene 1976The United States Of America As Represented By The Secretary Of AgricultureMethod of reducing water content of emulsions, suspensions, and dispersions with highly absorbent starch-containing polymeric compositionsUS39811008 Sep 197521 Sep 1976The United States Of America As Represented By The Secretary Of AgricultureHighly absorbent starch-containing polymeric compositionsUS39856168 Sep 197512 Oct 1976The United States Of America As Represented By The Secretary Of AgricultureImmobilization of enzymes with a starch-graft copolymerUS39974848 Sep 197514 Dic 1976The United States Of America As Represented By The Secretary Of AgricultureHighly-absorbent starch-containing polymeric compositionsUS407666329 Mar 197628 Feb 1978Sanyo Chemical Industries, Ltd.Water absorbing starch resinsUS40935422 Ene 19756 Jun 1978Chemische Fabrik Stockhausen & CieFlocculating agent comprising water-in-oil emulsion of H-active polymer carrying formaldehyde and amine radicalsUS41136853 May 197612 Sep 1978Chemische Fabrik Stockhausen & CieFlocculating agent comprising water-in-oil emulsion of stabilizer plus NH-active polymer carrying formaldehyde and amine radicalsUS41348636 Dic 197616 Ene 1979The United States Of America As Represented By The Secretary Of AgricultureHighly absorbent graft copolymers of polyhydroxy polymers, acrylonitrile, and acrylic comonomersUS415588817 Abr 197822 May 1979A. E. Staley Manufacturing CompanyWater-absorbent starchesUS419499830 Oct 197825 Mar 1980The United States Of America As Represented By The Secretary Of AgricultureHighly absorbent polyhydroxy polymer graft copolymers without saponificationUS432348722 Oct 19796 Abr 1982Henkel CorporationAbsorbent starch graft polymer and method of its preparationUS436729713 Feb 19814 Ene 1983Chemische Fabrik Stockhausen GmbhWater-soluble poly(meth)acrylic acid derivatives gels and their manufactureUS440807326 Dic 19794 Oct 1983Chemische Fabrik Stockhausen & CieProcess for preparation of α, β-unsaturated N-substituted-carboxylic acid amidesUS44590684 Ene 198210 Jul 1984The Dow Chemical CompanyMethod of increasing the absorbent capacity of plant soilsUS448395010 Dic 198220 Nov 1984The United States Of America As Represented By The Secretary Of AgricultureModified starches as extenders for absorbent polymersUS452835011 Jul 19839 Jul 1985Chemische Fabrik Stockhausen & CiePolymers of α,β-unsaturated N-substituted carboxylic acid amidesUS471191913 Feb 19858 Dic 1987Chemische Fabrik Stockhausen GmbhWater-soluble polymers plus natural resins sizing agentUS476617311 May 198723 Ago 1988Nalco Chemical CompanyMethod for reducing residual acrylic acid in acrylic acid polymer gelsUS477396729 Ene 198727 Sep 1988Chemische Fabrik Stockhausen GmbhWater-soluble polymers plus natural resins as sizing agentsUS498339024 Jun 19888 Ene 1991Lee County Mosquito Control DistrictTerrestrial delivery compositions and methods for controlling insect and habitat-associated pest populations in terrestrial environmentsUS511871922 Oct 19912 Jun 1992Nalco Chemical CompanyEnhancing absorption rates of superabsorbents by incorporating a blowing agentUS51225441 Nov 199116 Jun 1992Nalco Chemical CompanyProcess for producing improved superabsorbent polymer aggregates from finesUS514734310 Abr 198915 Sep 1992Kimberly-Clark CorporationAbsorbent products containing hydrogels with ability to swell against pressureUS51547134 Mar 199213 Oct 1992Nalco Chemical CompanyEnhancing absorption rates of superabsorbents by incorporating a blowing agentUS517679713 May 19915 Ene 1993Chemische Fabrik Stockhausen GmbhManufacturing paper employing a polymer of acrylic or methacrylic acidUS522131319 Sep 199122 Jun 1993Tennessee Valley AuthorityMicronutrient delivery systems using hydrophilic polyacrylamidesUS529240427 Mar 19928 Mar 1994Chemische Fabrik Stockhausen GmbhProcess for trash removal or pitch-like resin control in the paper manufactureUS5350799 *7 May 199127 Sep 1994Hoechst Celanese CorporationProcess for the conversion of fine superabsorbent polymer particles into larger particlesUS551264613 Sep 199330 Abr 1996Chemische Fabrik Stockhausen GmbhWater soluble powdered cationic polyelectrolyte comprising a copolymer of acrylamide and dimethylaminopropylacrylamide essentially free of bifunctional compoundsUS556747831 May 199522 Oct 1996Chemische Fabrik Stockhausen GmbhProcess for producing a water-absorbing sheet material and the use thereofUS582128624 May 199613 Oct 1998Biotechnology Research & Development CorporationBiodegradable polyester and natural polymer compositions and films therefromUS585384811 Ago 199529 Dic 1998Uni-Star Industries, Ltd.Biodegradable foamed product from a starch graft copolymerUS585637019 Dic 19945 Ene 1999Stockhausen Gmbh & Co. KgCross-linked synthetic polymers having a porous structure, a high absorption rate for water, aqueous solutions and body fluids, a process for their production and their use in the absorption and/or retention of water and/or aqueous liquidsUS5965149 *14 Feb 199412 Oct 1999Thermo Trilogy CorporationGranular formulation of biological entities with improved storage stabilityUS60484678 Sep 199711 Abr 2000Stockhausen Gmbh & Co. KgLeather-treatment agents, process for their preparation, and their use for producing low-fogging leathersUS622183212 Nov 199924 Abr 2001Stockhausen Gmbh & Co. KgCompacted granulate, process for making same and use as disintegrating agent for pressed detergent tablets, cleaning agent tablets for dishwashers, water softening tablets or scouring salt tabletsUS622896427 May 19978 May 2001Chemische Fabrik Stockhausen GmbhWater soluble, powdered, cationic polyelectrolyte comprising a copolymer of acrylamide and dimethylaminopropylacrylamide essentially free of bifunctional compoundsUS623228512 Nov 199915 May 2001Stockhausen Gmbh & Co. KgCompacted granulate, process for making same and use as disintegrating agent for pressed detergent tablets, cleaning agent tablets for dishwashers, water softening tablets and scouring salt tabletsUS630356027 Mar 200016 Oct 2001Stockhausen Gmbh & Co. KgCompacted disintegrant granulate for compression-molded articles, its production and its useUS66608191 Oct 20029 Dic 2003Stockhausen Gmbh & Co. KgMethod for producing synthetic polymerizates with a very low residual monomer content, products produced according to this method and the use thereofUS675815210 Jun 20026 Jul 2004Sod Guys, Inc.Application of hydrophilic polymer to existing sodUS68007127 Oct 20025 Oct 2004Steven William DoaneStarch graft copolymers and method of making and using starch graft copolymers for agricultureUS688947126 Abr 200110 May 2005Charles A. ArnoldPolyacrylamide suspensions for soil conditioningUS7009020 *21 Ene 20047 Mar 2006Milan H. SavichMethods of forming superabsorbent polymer products for use in agricultureUS20030020043 *14 Jun 200230 Ene 2003Grain Processing CorporationBiodegradable sorbentsUS2004007427115 Oct 200322 Abr 2004Krysiak Michael DennisSoil stabilizer carrierUS20060047068 *26 Ago 20052 Mar 2006Doane William MSuperabsorbent polymers in agricultural applicationsUS20060058502 *7 Nov 200516 Mar 2006Doane Steven WSuperabsorbent polymer product and use in agricultureUS20070015878 *8 Ago 200618 Ene 2007Savich Milan HSuperabsorbent polymer products including a beneficial additive and methods of making and applicationUS2007004452831 Ago 20061 Mar 2007American Soil Technologies, Inc.Soil Amendment* Citada por examinadorOtras citasReferencia1"Starch-Encapsulated Pesticides: ARS Papers Presented at the International Seminar on Research and Development of Controlled-Release Formulations of Pesticides". Vienna, Austria Sep. 6-10, 1993 United States Department of Agriculture; Agricultural Service; 1995-1; Nov. 1994.2 *Burkhardt et al. Plastic,Processing, Ullmann's Encyclopedia of Industrial Chemistry, Abstrct and pp. 1-5, Jun. 15, 2000.3Mikkelsen, Robert L. et al.; "Addition of Gel-Forming Hydrophilic Polymers to Nitrogen Fertilizer Solutions". Fertilizer Solutions, Fertilizer Research 36: 55-61, 1993.4Mikkelsen, Robert L.; "Using Hydrophilic Polymers to Control Nutrient Release" Fertilizer Research 38: 53-59, 1994.5Office Action mailed on Aug. 2, 2007 in regard to Patent Application No. 11/500,698.6Office Action mailed on Jan. 16, 2007 in regard to Patent Application No. 11/269,214.7Office Action mailed on Mar. 19, 2007 in regard to Patent Application No. 11/500,698.8Office Action mailed on May 9, 2007 in regard to Patent Application No. 11/213,563.9Office Action mailed on Oct. 22, 2007 in regard to Patent Application No. 11/213,563.10Office Action mailed on Sep. 17, 2007 in regard to Patent Application No. 11/269,214.11Press release titled, "A New Way of Reducing Water Consumption". (Nov. 7, 2001) http://ewire.com/displayccfm/Wire<SUB>-</SUB>ID/809.12Stockosorb Agro; David W. Cox, 2004 Scholarship Report available at: http://nuffield.com.au/report<SUB>-</SUB>f/2004/David%20Cox%202004%20report.pdf (Aug. 19, 2006).13Thompson, C. A.; "Effects of Stockosorb on Grain Sorghum in Central Kansas". 1998 Kansas Fertilizer Research Report of Progress 829; p. 36-46; Kansas State University-Manhattan, Kansas.14Thompson, C. A.; "Effects of the Cross-Linked Polyacrylamide Stockosorb on Wheat, Triticale, and Grain and Forage Sorghums in Central Kansas". 1999 Kansas Fertilizer Research Report of Progress 847; p. 21-35; Kansas State University-Manhattan, Kansas.15Thompson, C. A.; "Effects of the Cross-Linked Polyacrylamide Stockosorb on Winter Wheat, Triticale, and Grain and forage Sorghum in Central Kansas". 2000 Kansas Fertilizer Research Report of Progress 868; p. 29-40; Kansas State University-Manhattan, Kansas.* Citada por examinadorClasificaciones Clasificaci�n de EE.UU.525/242, 527/103, 525/330.1, 428/403, 525/54.3, 428/327, 428/402, 525/360, 527/312 Clasificaci�n internacionalC08F251/00, C08L3/04, C05G3/00, C09K17/00, C05G3/04, C08H8/00, A01N25/10, C08G63/48, C08B37/00, C09D103/04 Clasificaci�n cooperativaA01N25/10, C05G3/0047, C05G3/04, C08F251/00 Clasificaci�n europeaC05G3/04, C08F251/00, A01N25/10, C05G3/00B4Eventos legales FechaC�digoEventoDescripci�n24 Feb 2012FPAYFee paymentYear of fee payment: 410 Nov 2005ASAssignmentOwner name: ABSORBENT TECHNOLOGIES, INC., OREGONFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOANE, DR WILLIAM M;DOANE, MR. STEVEN W.;D2 POLYMER TECHNOLOGIES, INC.;REEL/FRAME:016761/0224;SIGNING DATES FROM 20051103 TO 2005110415 Dic 2004ASAssignmentOwner name: ABSORBENT TECHNOLOGIES, INC., OREGONFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAVICH, MILAN H.;REEL/FRAME:016104/0587Effective date: 20041213GirarImagen originalP�gina principal de Google - Sitemap - Descargas masivas de USPTO - Pol�tica de privacidad - Condiciones de servicio - Acerca de Google Patentes - Danos tu opini�nDatos proporcionados por IFI CLAIMS Patent Services©2012 Google