CL2019000105A1 - Cemento espumado liviano, placa de cemento y métodos para hacerlos. - Google Patents
Cemento espumado liviano, placa de cemento y métodos para hacerlos.Info
- Publication number
- CL2019000105A1 CL2019000105A1 CL2019000105A CL2019000105A CL2019000105A1 CL 2019000105 A1 CL2019000105 A1 CL 2019000105A1 CL 2019000105 A CL2019000105 A CL 2019000105A CL 2019000105 A CL2019000105 A CL 2019000105A CL 2019000105 A1 CL2019000105 A1 CL 2019000105A1
- Authority
- CL
- Chile
- Prior art keywords
- cement
- cementous
- foamed
- composition
- foam
- Prior art date
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2623—Polyvinylalcohols; Polyvinylacetates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/141—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0088—Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/32—Superplasticisers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/34—Flow improvers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/48—Foam stabilisers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Civil Engineering (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Environmental & Geological Engineering (AREA)
- Dispersion Chemistry (AREA)
- Nanotechnology (AREA)
- Combustion & Propulsion (AREA)
Abstract
SE DESCRIBE UNA COMPOSICIÓN CEMENTOSA ESPUMADA QUE LIMITA O ELIMINA EL AGREGADO, ESPECIALMENTE EL AGREGADO LIVIANO POROSO, Y USA UNA RELACIÓN EN PESO MÁS BAJA DE LO NORMAL DE AGUA CON RESPECTO A LA COMPOSICIÓN CEMENTOSA. LAS MEZCLAS DE ESPUMA CEMENTOSA ESTABLES PUEDEN EMPLEARSE PARA HACER PLACAS DE CEMENTO Y OTROS PRODUCTOS DE CEMENTO. LA COMPOSICIÓN CEMENTOSA ESPUMADA SE HIZO CON ADICIONES DE AGENTES ESTABILIZADORES DE FORMACIÓN DE ESPUMA DE PVOH Y AGENTES ESPUMANTES TENSIOACTIVOS PARA HACER AGUA DE ESPUMA O MEDIANTE LA FORMACIÓN DE BURBUJAS DE AIRE EN MEZCLAS DE LECHADA CEMENTOSA. LAS MEZCLAS CEMENTOSAS TIENEN UNA CANTIDAD LIMITADA O, PREFERENTEMENTE, CARECEN DE PERLITA O AGREGADOS LIVIANOS. LA MEZCLA ESPUMADA RESULTANTE TENÍA BURBUJAS DE ESPUMA CON UN TAMAÑO EN EL RANGO QUE VA DE 50 A 200 µM. DESPUÉS DE FRAGUAR LA COMPOSICIÓN CEMENTOSA ESPUMADA, LA PLACA FRAGUADA RESULTANTE TIENE CELDAS DE AIRE CON UN TAMAÑO EN EL RANGO QUE VA DE 50 A 200 UM.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/213,751 US10040725B2 (en) | 2016-07-19 | 2016-07-19 | Lightweight foamed cement, cement board, and methods for making same |
Publications (1)
Publication Number | Publication Date |
---|---|
CL2019000105A1 true CL2019000105A1 (es) | 2019-04-22 |
Family
ID=59388239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CL2019000105A CL2019000105A1 (es) | 2016-07-19 | 2019-01-11 | Cemento espumado liviano, placa de cemento y métodos para hacerlos. |
Country Status (13)
Country | Link |
---|---|
US (1) | US10040725B2 (es) |
EP (1) | EP3487831A1 (es) |
JP (1) | JP2019525885A (es) |
KR (1) | KR20190032405A (es) |
CN (1) | CN109476558A (es) |
AU (1) | AU2017299504A1 (es) |
BR (1) | BR112019000369A2 (es) |
CA (1) | CA3031200A1 (es) |
CL (1) | CL2019000105A1 (es) |
CO (1) | CO2019001219A2 (es) |
MX (1) | MX2019000435A (es) |
PE (1) | PE20190280A1 (es) |
WO (1) | WO2018017441A1 (es) |
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KR101619331B1 (ko) * | 2015-09-23 | 2016-05-10 | 주식회사 버미코리아 | 슬림형 건축마감용 질석보드 |
US10677698B2 (en) * | 2016-06-15 | 2020-06-09 | United States Gypsum Company | System and method for manufacturing cementitious boards with on-line slurry set measurement |
US11339572B1 (en) | 2017-01-23 | 2022-05-24 | Gold Bond Building Products, Llc | Method of manufacturing gypsum board with improved fire |
CA3053248A1 (en) * | 2017-02-13 | 2018-08-16 | Gcp Applied Technologies Inc. | Early strength enhancement of cements |
CN108947579A (zh) * | 2018-09-20 | 2018-12-07 | 扬州工业职业技术学院 | 一种新型轻质、抗压、保温泡沫混凝土砌块 |
DE102018008701A1 (de) | 2018-11-06 | 2020-05-07 | K+S Aktiengesellschaft | Verwendung von Mineralschaum zur Haldenabdeckung |
US11180412B2 (en) | 2019-04-17 | 2021-11-23 | United States Gypsum Company | Aluminate-enhanced type I Portland cements with short setting times and cement boards produced therefrom |
WO2020234462A1 (de) * | 2019-05-21 | 2020-11-26 | WEKO Consulting and Engineering Ltd. | Verfahren zur herstellung eines schaumbetons und eines bauelements |
CN111302831A (zh) * | 2019-05-29 | 2020-06-19 | 纳米及先进材料研发院有限公司 | 一种具有良好导热性的低强度回填材料 |
CN110746156A (zh) * | 2019-10-31 | 2020-02-04 | 西安石油大学 | 一种开孔泡沫水泥及其制备方法和应用 |
CN112521123B (zh) * | 2020-12-26 | 2022-04-01 | 南京航空航天大学 | 一种碱式硫酸镁水泥泡沫混凝土保温材料的制备方法 |
CN114477833A (zh) * | 2022-01-25 | 2022-05-13 | 重庆彼目加科技有限公司 | 一种轻质水泥基专用泡沫剂及其制备方法 |
CN114702280A (zh) * | 2022-04-13 | 2022-07-05 | 湖南省富民乐建材科技发展有限公司 | 一种用于沉箱型卫生间的轻质发泡填充材料 |
CN114890738B (zh) * | 2022-05-09 | 2023-07-28 | 阳江海上风电实验室 | 海上风机吸力筒填充专用水下轻质灌浆料及其制备方法 |
CN116041776B (zh) * | 2022-11-01 | 2024-05-14 | 巴斯特医药科技(常州)有限公司 | 一种含复合层高连通性微孔壁气穴仿生聚乙烯醇结构体的制备方法 |
KR102600053B1 (ko) * | 2022-11-08 | 2023-11-10 | 한국도시재생기술(주) | 바텀애쉬를 이용한 발포 경량블럭 |
CN115677297B (zh) * | 2022-11-23 | 2023-12-19 | 河南华泰新材科技股份有限公司 | 预制墙板回填材料及其施工工艺 |
CN115974582B (zh) * | 2022-11-24 | 2024-02-02 | 东方雨虹民用建材有限责任公司 | 一种发泡回填材料及其制备方法和使用方法 |
CN116199463A (zh) * | 2023-03-13 | 2023-06-02 | 华润水泥技术研发有限公司 | 一种利用气硬性胶凝材料制备的泡沫混凝土及其制备方法 |
CN117263718B (zh) * | 2023-09-14 | 2024-04-19 | 东北大学 | 一种泡沫陶瓷相似材料及其制备方法、生产装置和应用 |
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US8519016B2 (en) | 2010-12-30 | 2013-08-27 | United States Gypsum Company | Lightweight foamed fly ash based binders and method |
FR2989083B1 (fr) | 2012-04-06 | 2014-04-25 | Lafarge Sa | Mousse minerale isolante |
US9994484B2 (en) | 2013-07-30 | 2018-06-12 | United States Gypsym Company | Fast setting portland cement compositions with alkali metal citrates and phosphates with high early-age compressive strength and reduced shrinkage |
US9840440B2 (en) * | 2013-11-29 | 2017-12-12 | Nano And Advanced Materials Institute Limited | Hydrophobic low shrinkage lightweight cementitious matrix |
FR3021652B1 (fr) * | 2014-05-27 | 2016-05-27 | Saint-Gobain Weber | Procede de fabrication d'une composition de beton ou mortier allege |
WO2016010489A1 (en) | 2014-07-16 | 2016-01-21 | Siam Mortar Co., Ltd. | A mortar composition having good flowability |
-
2016
- 2016-07-19 US US15/213,751 patent/US10040725B2/en not_active Expired - Fee Related
-
2017
- 2017-07-17 CN CN201780043421.4A patent/CN109476558A/zh active Pending
- 2017-07-17 BR BR112019000369-0A patent/BR112019000369A2/pt not_active Application Discontinuation
- 2017-07-17 JP JP2019500877A patent/JP2019525885A/ja active Pending
- 2017-07-17 AU AU2017299504A patent/AU2017299504A1/en not_active Abandoned
- 2017-07-17 EP EP17743215.0A patent/EP3487831A1/en not_active Withdrawn
- 2017-07-17 KR KR1020197003243A patent/KR20190032405A/ko unknown
- 2017-07-17 MX MX2019000435A patent/MX2019000435A/es unknown
- 2017-07-17 CA CA3031200A patent/CA3031200A1/en not_active Abandoned
- 2017-07-17 WO PCT/US2017/042303 patent/WO2018017441A1/en unknown
- 2017-07-17 PE PE2019000019A patent/PE20190280A1/es unknown
-
2019
- 2019-01-11 CL CL2019000105A patent/CL2019000105A1/es unknown
- 2019-02-12 CO CONC2019/0001219A patent/CO2019001219A2/es unknown
Also Published As
Publication number | Publication date |
---|---|
US20180022653A1 (en) | 2018-01-25 |
CO2019001219A2 (es) | 2019-02-19 |
EP3487831A1 (en) | 2019-05-29 |
CN109476558A (zh) | 2019-03-15 |
AU2017299504A1 (en) | 2019-02-21 |
MX2019000435A (es) | 2019-06-20 |
CA3031200A1 (en) | 2018-01-25 |
JP2019525885A (ja) | 2019-09-12 |
WO2018017441A1 (en) | 2018-01-25 |
PE20190280A1 (es) | 2019-02-27 |
US10040725B2 (en) | 2018-08-07 |
BR112019000369A2 (pt) | 2019-04-24 |
KR20190032405A (ko) | 2019-03-27 |
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