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Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 8187374 | Process for manufacturing clinker with controlled COemission The invention relates to a process for manufacturing clinker from a raw mix, implementing the following: preheating of the raw mix by combustion flue gases; precalcination of the raw mix; and calcination of the precalcined raw mix in a rotary kiln, in which process ... | 05/29/2012 |
| 7351281 | Powdered material and ceramic material manufactured therefrom Powdered material, the binder phase of which mainly consists of a cement-based system, which powdered material has the capacity following saturation with a liquid reacting with the binder phase to hydrate to a chemically bonded ceramic material, preferably for denta... | 04/01/2008 |
| 7338925 | Zeolite compositions having enhanced compressive strength Wellbore treating fluids that include zeolite, an activator, and an organic acid or salt thereof are provided. ... | 03/04/2008 |
| 7332026 | Cementitious compositions containing interground cement clinker and zeolite Methods and compositions for wellbore treating fluids, especially cementitious compositions that include interground cement clinker and zeolite, with and without gypsum. ... | 02/19/2008 |
| 7326290 | Liquid setting accelerator for a composition comprising Portland cement The invention relates to a setting accelerator for a composition comprising Portland cement, in the form of a slurry comprising at least one calcium aluminate, 0.5 4%, preferably 0.6 2.3% of an aluminous cement setting inhibitor by weight in relation to the overall ... | 02/05/2008 |
| 7326291 | Cementitious compositions containing interground cement clinker and zeolite Methods and compositions for wellbore treating fluids, especially cementitious compositions that include interground cement clinker and zeolite, with and without gypsum. ... | 02/05/2008 |
| 7303015 | Cementitious compositions containing interground cement clinker and zeolite Methods and compositions for wellbore treating fluids, especially cementitious compositions that include interground cement clinker and zeolite, with and without gypsum. ... | 12/04/2007 |
| 7285164 | Fluid loss additives for cement slurries Methods for cementing in a subterranean zone, which use a cement composition that includes zeolite, cementitious material, proportioned fluid loss control additives and a mixing fluid. Cement compositions containing proportioned fluid loss control additives, and met... | 10/23/2007 |
| 7285166 | Zeolite-containing cement composition Methods and cement compositions are provided for sealing a subterranean zone penetrated by a wellbore, wherein the cement composition comprises zeolite, cementitious material, and a mixing fluid. ... | 10/23/2007 |
| 7279039 | Method and apparatus for controlling pollution from a cement plant A method and apparatus for reducing air pollutants associated with dry process, precalciner cement manufacturing is shown. Raw feed meal used in cement production is heated in a special heating chamber to drive off volatile compounds, such as organic materials and s... | 10/09/2007 |
| 7228905 | Zeolite compositions having enhanced compressive strength Methods for performing wellbore operations using a treating fluid that includes zeolite, an activator, and an organic acid or salt thereof. The treating fluid used in the methods includes a zeolite having a mean particle size that is less than or equal to 100 micron... | 06/12/2007 |
| 7219733 | Zeolite compositions for lowering maximum cementing temperature Zeolite compositions having a low maximum setting temperature for use in permafrost and waterwell applications are provided. ... | 05/22/2007 |
| 7182137 | Cementitious compositions containing interground cement clinker and zeolite Methods and compositions for wellbore treating fluids, especially cementitious compositions that include interground cement clinker and zeolite, with and without gypsum. ... | 02/27/2007 |
| 7150786 | Very early setting ultra-high strength cement Clinkered materials containing high concentrations of {(C,K,N,M)4(A,F,Mn,P,T,S)3(cl,{overscore (S)})} (crystal X), and {(C2S)3(C{overscore (S)})3 Ca(f,cl) 2} or {(C2S)3(C{oversco... | 12/19/2006 |
| 7001454 | Clinker and white portland cement with a high sulfur content derived from a high sulfur content pet-coke used as fuel The present invention relates to a family of white clinker compositions with a high capacity to fix sulfur derived from a high sulfur content pet-coke used as fuel in the manufacture thereof, which further exhibits low fuel composition and fast setting, achieved by ... | 02/21/2006 |
| 6997984 | Cement admixture A burned product containing 100 parts by weight of C2S, 10 to 100 parts by weight of C2AS, and 20 parts by weight or less of C3A; a cement admixture prepared by grinding the burned product; and a cement containing 100 parts by weight... | 02/14/2006 |
| 6758896 | Rapid hardening, ultra-high early strength portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions Clinkered materials containing high concentrations of {(C,K,N,M)4 (A,F,Mn,P,T,S)3 Cl,{overscore (S)})}(crystal X), and {C2S)3(C{overscore (S)})3Ca(f,Cl)2} or C9S3{overscore (S)} | 07/06/2004 |
| 6752865 | Process for manufacturing of high iron hydraulic cement clinker The present invention describes a process for manufacture of high iron hydraulic cement clinker in production of cement and cementation binder for application in construction activity and in metallurgical industry for sintering of iron ore fines and making cold bond... | 06/22/2004 |
| 6730159 | Clinker hydraulic binder, use and method for making same A clinker-type hydraulic binder obtained by burning comprising a magnesia spinel mineralogical phase and at least a calcium aluminate mineralogical phase, with a lime content less than 15% of the binder by dry weight. The magnesia spinel represents between 68% and 8... | 05/04/2004 |
| 6695910 | Sulfoaluminous clinker without iron and without free lime, its process of preparation and its use in white binders The lightly colored sulfoaluminous clinker contains: more than 55% by weight of calcium sulfoaluminate phase (C4 A3 S), more than 10% by weight of belite phase (C2 S), less than 10% by weight of anhydrite (CS), and contain... | 02/24/2004 |
| 6689207 | Method and plant for making alumina cement and alumina cement The concentration d3 is alumina AL2 O3, --A--, and the concentration d4 in lime CaO, --C--, in the initial mixture are such that d3/d4 ranges between 1.15 and 1.40. Grinding produces a cement with a size distribution as represented i... | 02/10/2004 |
| 6602343 | Quick setting cement with lime and aluminates The present invention refers to a hydraulic binder made from Portland clinker containing calcium fluoroaluminate 11CaO.7Al2 O3.CaF.sub.2, to which sodium aluminate, lime, and optionally, sodium bicarbonate are added. The added lime h... | 08/05/2003 |
| 6537365 | Cement clinker, cement composition, method for producing cement clinker, and method for treatment of waste containing alkali component Cement clinker, characterized in that it comprises Al2 O3 and Fe2 O3 wherein the mass ratio of Al2 O3 /Fe2 O3 is 0.05-0.62, and alkali components and C2 S wherei... | 03/25/2003 |
| 6447597 | Hydrated calcium aluminate based expansive admixture An additive, a mixture incorporating the additive and a method of formulating a mortar incorporating the additive. The additive is based on calcium sulfoaluminate composed of C3 AH6 and CAH10 where C=calcium oxide, A=alumi... | 09/10/2002 |
| 6406534 | Rapid hardening, ultra-high early strength portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions Clinkered materials containing high concentrations of {(C,K,N,M)4 (A,F,Mn,P,T,S)3 Cl,S)}(crystal X), and {C2 S)3 (CS)3 Ca(f,Cl)2 } or C9 S3 S3 Ca(f,cl)2 | 06/18/2002 |
| 6238633 | Process for preparing calcium aluminate from aluminum dross A non-metallic product (NMP) substantially free of metallic aluminum and aluminum nitride which is utilized for making calcium aluminate.... | 05/29/2001 |
| 6190449 | Method for eliminating waste sulfurous acids coming from industrial treatments and for obtaining stable products The method comprises the steps of: preparing a belitic crude cement, neutralizing waste sulfurous acids by means of at least clay-calcareous fines which are thus transformed into artificial gypsum, and adding said artificial gypsum to the belitic crude ce... | 02/20/2001 |
| 6149724 | Hydraulic cement with accelerated high strength development A method of manufacturing cements based on calcium sulfoaluminate by forming a clinker through calcining a selection of typical cement precursor raw materials to temperatures of more than 1200° C. in an industrial kiln, preferably with a preheater (typic... | 11/21/2000 |
| 6113684 | Rapid hardening, ultra-high early strength Portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions Clinkered materials containing high concentrations of {(C,K,N,M)4 (A,F,Mn,P,T,S)3 Cl,S)}(crystal X), and {C2 S)3 (CS)3 C(f,Cl)} or C10 S3 S3 (f,cl) (crystal Y), and/or {C | 09/05/2000 |
| 6005057 | Cement grinding aid A cement clinker grinding aid which comprises a styrene-maleic anhydride copolymer (SMA) superplasticiser. The SMA is preferably a type with polyoxyalkylene-based side chains. Use of the grinding aid renders the grinding process more efficient and improve... | 12/21/1999 |
| 5741357 | Hydrated high alumina cement A hydraulic cement composition is disclosed which utilizes as part of an expansive component novel coated particles of high alumina cement. The particles have a core of substantially unhydrated high alumina cement and an outer layer of hydration products ... | 04/21/1998 |
| 5624489 | Conversion-preventing additive for high alumina cement products Additives for high alumina cement compositions are proposed. The additives are effective to reduce or prevent the deleterious conversion of hexagonal calcium aluminate hydrates to cubic hydrogarnet in the high alumina cement compositions. The additives co... | 04/29/1997 |
| 5549745 | Non-slumping, pumpable castable and method of applying the same An essentially non-slumping, high density, low moisture and low cement castable composition, consisting of a tempered, pumpable first component containing the castable solids and consisting essentially of a refractory aggregate, a calcium-aluminate cement... | 08/27/1996 |
| 5527387 | Computer implemented processes for microstructurally engineering cementious mixtures A design optimization process used to determine the proportions of sand, cement, coarse aggregate, water, fly ash, water reducers, air entraining agents and fillers needed to produce a concrete mixture that has desired strength and slump properties and a ... | 06/18/1996 |
| 5512523 | Monolithic refractory powder mixture A monolithic refractory powder mixture containing from 2 to 3 wt % of spheroidized refractory particles having a mean particle size of at most 30 μm of at least one member selected from the group consisting of alumina cement, alumina, titania, bauxite, d... | 04/30/1996 |
| 5073197 | Cement compositions The advantages of high alumina cement (early strength, resistance to sulphate attack) are preserved and its disadvantage (weakens with age) is solved by mixing it 50:50 with silica fume, gasifier slag, fly ash or other pozzolanic or latently hydraulic mat... | 12/17/1991 |
| 5071484 | Cementitious compositions and method A cementitious composition capable of forming an early high strength cement when admixed with a liquid comprising a cementitious material of a specific chemical composition, surface area, and particle size distribution, the method of making such cementiti... | 12/10/1991 |
| 4957556 | Very early setting ultra high early strength cement Methods for forming very early setting, ultra high strength cements and the cements so produced are claimed. The methods comprise forming a mixture of raw materials containing SiO2, Al2 O3, CaO, Fe2 O3 | 09/18/1990 |
| 4396422 | Process for producing iron and refractory material There is disclosed a process for producing iron and refractory material for use as a raw material for a refractory brick and as an aggregate for a castable refractory product. A mixture of aluminum smelting residue and scale is introduced into a furnace. ... | 08/02/1983 |
| 4330336 | Method of producing low-line aluminous cement from aluminum smelting residue A certain amount of a starting calcarious material is added to an aluminum smelting residue, the mixture is smelted or semi-smelted, air is blown to the smelted or semi-smelted product to oxidize A/N, and the smelted or semi-smelted product is finely pulv... | 05/18/1982 |
