LU501302B1 - Double liquid grouting material for soft soil subgrade reinforcement and method - Google Patents
Double liquid grouting material for soft soil subgrade reinforcement and method Download PDFInfo
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- LU501302B1 LU501302B1 LU501302A LU501302A LU501302B1 LU 501302 B1 LU501302 B1 LU 501302B1 LU 501302 A LU501302 A LU 501302A LU 501302 A LU501302 A LU 501302A LU 501302 B1 LU501302 B1 LU 501302B1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- 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
-
- 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
- C04B28/06—Aluminous cements
-
- 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
- C04B40/0641—Mechanical separation of ingredients, e.g. accelerator in breakable microcapsules
- C04B40/065—Two or more component mortars
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Analytical Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A double liquid grouting material for soft soil subgrade reinforcement and a method, wherein the double liquid grouting material is formed by mixing component A and component B; the component A consists of the following materials in parts by weight: 20-50 parts of ordinary portland cement, 20-50 parts of fine sand, 0.8-2.0 parts of silica fume, 0.2-0.5 part of water reducing agent, 0.02-0.05 part of triethanolamine, 12-30 copies of water; component B: 15-45 parts of water glass, 4-10 parts of dilute sulfuric acid, 0.1-0.3 part of aluminum chloride. This material has the advantages of short setting time, high early strength, low cost, good impermeability and micro-expansion performance, which is of great significance to the development of soft soil subgrade reinforcement.
Description
DESCRIPTION HUS01802
TECHNICAL FIELD The invention relates to a double liquid grouting material for soft soil subgrade reinforcement, which belongs to the technical field of road engineering.
BACKGROUND China's highway construction has developed rapidly, and in just over twenty years, it has made achievements in highway construction abroad for more than half a century. In most highways, asphalt pavement accounts for the majority, but restricted by China's economic and technical conditions, the vast majority of asphalt pavements at present still belong to strong base and thin asphalt pavement, which is composed of semi-rigid base with high strength and thin asphalt pavement, and asphalt pavement is not the main bearing layer. Moreover, due to insufficient attention to the research of design and construction technology, many early diseases of asphalt pavement appear, so that when the road is far from reaching the design life, large and medium-sized repairs are needed, and the maintenance cost is greatly increased.
As a new way of pavement repair, highway grouting plays a good role in pavement repair projects in recent years because of its short construction time and quick effect. Grouting materials are mainly composed of organic and inorganic materials, which can be composed of mechanical grouting materials, inorganic grouting materials and mixed organic and inorganic grouting materials. Among them, inorganic materials are widely used in engineering because of their convenient materials, easy construction and good economic benefits. In actual construction, single cement is widely used as grouting material, which has the characteristics of good fluidity before grouting and high strength at the later stage. However, the grout has a long setting time and low early strength, which greatly affects the grouting filling effect and needs to be significantly improved in economy and micro-expansion. Therefore, it is of great significance to develop a double liquid grouting material with short setting time, high early strength, low cost, impermeability and slight expansion HUS01802 for the development of soft soil subgrade reinforcement.
SUMMARY Purpose of the invention: The invention provides a double liquid grouting material for soft soil subgrade reinforcement, aiming at solving the problem that the traditional grouting material can not meet the requirements of soft soil subgrade reinforcement due to its short setting time, low early strength, high cost, impermeability and poor micro-expansion performance.
Technical proposal: A double liquid grouting material for soft soil subgrade reinforcement is characterized in that the double liquid grouting material is formed by mixing component A and component B; the component A consists of the following materials in parts by weight: 20-50 parts of ordinary portland cement, 20-50 parts of fine sand,
0.8-2.0 parts of silica fume, 0.2-0.5 part of water reducing agent, 0.02-0.05 part of triethanolamine and 12-30 parts of water, component B: 15-45 parts of water glass (Na2O NS10,), 4-10 parts of dilute sulfuric acid and 0.1-0.3 part of aluminum chloride.
The weight ratio of component A to component B is between 2:1 and 6:1.
The ordinary portland cement is PO42.5 R ordinary cement, and the particle size of the fine sand 1s 0.3-1.18 mm.
The mass ratio of cement to fine sand is 1:1.
The silica fume is micro silica powder with an average particle size of 0.1 um, a specific surface area of 21 m?/g, a SiO; content of more than 90% and a water content of less than 2%.
The water reducing agent is an early strength water reducing agent, and is at least one of polycarboxylate superplasticizer and naphthalene water reducing agent.
The water glass is sodium silicate, the Baume degree of the solution is not less than 38°Be', and the modulus is 3.0.
The concentration of that dilute sulfuric acid solution is not high than 30%.
The aluminum chloride is crystalline powder. 7501302 According to the preparation method of the double liquid grouting material for soft soil subgrade reinforcement, the method is realized by the following steps: (1) Preparation of component A: adding 20-50 parts of cement and 0.8-2.0 parts of silica fume into 20-50 parts of fine sand, stirring uniformly, and then adding 12-30 parts of water, 0.2-0.5 part of water reducing agent and 0.02-0.05 part of triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding 4-10 parts of dilute sulfuric acid into 15-45 parts of water glass, stirring evenly, and then adding 0.1-0.3 part of aluminum chloride, and continuously stirring uniformly to obtain the product; (3) fully mixing the slurry of the component A and the slurry of the component B at the filling position by a mixer of a double liquid grouting pump under the pressure of 4-10 MPa, and the mixed slurry is in a fluid state; initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s.
Advantages: The invention provides a double liquid grouting material for soft soil subgrade reinforcement, which has the advantages of short setting time, high early strength, low cost, good impermeability and micro-expansion performance, and is of great significance to the development of soft soil subgrade reinforcement.
DESCRIPTION OF THE INVENTION The present invention will be further explained with specific embodiments below, but it is not limited to the present invention.
A double liquid grouting material for soft soil subgrade reinforcement is prepared by mixing component A and component B; the component A consists of the following materials in parts by weight: 20-50 parts of ordinary portland cement, 20-50 parts of fine sand, 0.8-2.0 parts of silica fume, 0.2-0.5 part of water reducing agent,
0.02-0.05 part of triethanolamine and 12-30 parts of water, component B: 15-45 parts of water glass (Na,O-Nsioz), 4-10 parts of dilute sulfuric acid and 0.1-0.3 part of aluminum chloride.
The weight ratio of component A to component B is between 2:1 and 6:1.
The ordinary portland cement is PO42.5 R ordinary cement, and the particle size HUS01802 of the fine sand 1s 0.3-1.18 mm.
The mass ratio of cement to fine sand is 1:1.
The invention relates to a preparation method of a double liquid grouting material for soft soil subgrade reinforcement, which is realized by the following steps: (1) Preparation of component A: adding 20-50 parts of cement and 0.8-2.0 parts of silica fume into 20-50 parts of fine sand, stirring uniformly, and then adding 12-30 parts of water, 0.2-0.5 part of water reducing agent and 0.02-0.05 part of triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding 4-10 parts of dilute sulfuric acid into 15-45 parts of water glass, stirring evenly, and then adding 0.1-0.3 part of aluminum chloride, and continuously stirring uniformly to obtain the product; (3) fully mixing the slurry of the component A and the component B at the filling position by a mixer of a double liquid grouting pump under the pressure of 4-10 MPa, and the mixed slurry is in a fluid state; initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s.
The ingredients involved in each specific embodiment of the invention are described as follows: the cement is PO42.5 R ordinary portland cement; the solid content of water glass is 40%, containing 26.5% SiO», 8.5% Na,O and 65.0% water; the purity of triethanolamine is 99.66% and the concentration of dilute sulfuric acid is 20%.
Embodiment 1: In this embodiment, the particle size of fine sand is < 0.3 mm.
A double liquid grouting material for soft soil subgrade reinforcement is prepared from the following raw materials in parts by weight: component A is prepared by mixing and stirring 30 parts of cement, 30 parts of fine sand, 1.2 parts of silica fume, 0.3 part of water reducing agent, 0.03 part of triethanolamine and 21 parts of water; component B is made of 27 parts of water glass, 6 parts of dilute sulfuric acid (28%) and 0.15 parts of aluminum chloride.
(1) Preparation of component A: adding cement and silica fume into fine sand, 7501302 stirring uniformly, and then adding water, water reducing agent and triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding dilute sulfuric acid into water glass, stirring evenly, and then adding aluminum chloride, and continuously stirring uniformly to obtain the product; the slurry of the component A and the slurry of the component B are fully mixed at the filling position by the slurry mixer of double liquid grouting pump under the pressure of 4-10 MPa, and the mixed slurry is in a fluid state. Initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s. The volume dry shrinkage of the material is -2.978% at room temperature, and it has micro-expansibility. Product index after 3 days: compressive strength 12 MPa, and product index after 28 days: compressive strength 30 MPa.
Embodiment 2: In this embodiment, the particle size of fine sand is > 0.3 mm and < 0.6 mm.
A double liquid grouting material for soft soil subgrade reinforcement is prepared from the following raw materials in parts by weight: component A is prepared by mixing and stirring 40 parts of cement, 40 parts of fine sand, 1.6 parts of silica fume, 0.4 part of water reducing agent, 0.04 part of triethanolamine and 24 parts of water; component B is made of 35 parts of water glass, 8 parts of dilute sulfuric acid (15%) and 0.2 part of aluminum chloride.
(1) Preparation of component A: adding cement and silica fume into fine sand, stirring uniformly, and then adding water, water reducing agent and triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding dilute sulfuric acid into water glass, and then adding aluminum chloride after stirring evenly, and continuously stirring uniformly to obtain the product; the slurry of the component A and the slurry of the component B are fully mixed at the filling position by the slurry mixer of the double liquid grouting pump, and the mixed slurry is in a fluid state. Initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s. The volume shrinkage rate of this material is HUS01802 -2.984% at normal temperature, and it has micro-expansibility. Product index after 3 days: compressive strength of 17 MPa, and product index after 28 days: compressive strength of 36.5 MPa.
The water reducing agent is an early strength water reducing agent, which is at least one of polycarboxylate superplasticizer and naphthalene water reducing agent.
Embodiment 3: In this embodiment, the particle size of fine sand is < 1.18 mm.
A double liquid grouting material for soft soil subgrade reinforcement is prepared from the following raw materials in parts by weight: component A is prepared by mixing and stirring 50 parts of cement, 50 parts of fine sand, 2.0 parts of silica fume, 0.5 part of water reducing agent (early strength water reducing agent),
0.05 part of triethanolamine and 30 parts of water; component B is made of 44 parts of water glass, 10 parts of dilute sulfuric acid (30%) and 0.25 part of aluminum chloride.
(1) Preparation of component A: adding cement and silica fume into fine sand, stirring uniformly, and then adding water, water reducing agent and triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding dilute sulfuric acid into water glass, and then adding aluminum chloride after stirring evenly, and continuously stirring uniformly to obtain the product; the slurry of the component A and the slurry of the component B are fully mixed at the filling position by the slurry mixer of double liquid grouting pump under the pressure of 4-10 MPa, and the mixed slurry is in a fluid state. Initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s. The volume dry shrinkage of this material is -2.983% at room temperature, and it has micro-expansibility. Product index after 3 days: compressive strength 16 MPa, product index after 28 days: compressive strength 35.2MPa.
Embodiment 4: In this embodiment, the particle size of fine sand is < 1.18 mm.
A double liquid grouting material for soft soil subgrade reinforcement is HUS01802 prepared from the following raw materials in parts by weight: component A is prepared by mixing and stirring 20 parts of cement, 20 parts of fine sand, 0.8 part of silica fume, 0.2 part of water reducing agent (polycarboxylate superplasticizer), 0.02 part of triethanolamine and 12 parts of water, component B is made of 15 parts of water glass, 4 parts of dilute sulfuric acid (12%) and 0.3 part of aluminum chloride.
(1) Preparation of component A: adding cement and silica fume into fine sand, stirring uniformly, and then adding water, water reducing agent and triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding dilute sulfuric acid into water glass, and then adding aluminum chloride after stirring evenly, and continuously stirring uniformly to obtain the product; the slurry of the component A and the slurry of the component B are fully mixed at the filling position by the slurry mixer of double liquid grouting pump under the pressure of 4 MPa, and the mixed slurry is in a fluid state. Initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s. The volume shrinkage of this material is -2.983% at room temperature, and it has micro-expansibility. Product index after 3 days: compressive strength 15 MPa, product index after 28 days: compressive strength 35.1 MPa.
Embodiment 5: In this embodiment, the particle size of fine sand is > 0.3 mm and < 0.6 mm.
A double liquid grouting material for soft soil subgrade reinforcement is prepared from the following raw materials in parts by weight: component A is prepared by mixing and stirring 40 parts of cement, 40 parts of fine sand, 1.6 parts of silica fume, 0.4 part of water reducing agent (naphthalene water reducing agent), 0.04 part of triethanolamine and 24 parts of water, component B is made of 45 parts of water glass, 10 parts of dilute sulfuric acid (26%) and 0.1 part of aluminum chloride.
(1) Preparation of component A: adding cement and silica fume into fine sand, stirring uniformly, and then adding water, water reducing agent and triethanolamine, and continuously stirring uniformly to obtain the product;
(2) preparation of component B: adding dilute sulfuric acid into water glass, and 7501302 then adding aluminum chloride after stirring evenly, and continuously stirring uniformly to obtain the product; the slurry of the component A and the slurry of the component B are fully mixed at the filling position by the slurry mixer of double liquid grouting pump under the pressure of 4 MPa, and the mixed slurry is in a fluid state. Initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s. The volume shrinkage of this material is -2.984% at room temperature, and it has micro-expansibility. Product index after 3 days: compressive strength 18 MPa, and product index after 28 days: compressive strength 35.8MPa.
The silica fume is micro silica powder with an average particle size of 0.1 um, a specific surface area of 21 m?/g, a SiO; content of more than 90% and a water content of less than 2%.
The water glass is sodium silicate, the Baume degree of the solution is not less than 38°Be', and the modulus is 3.0.
The concentration of the dilute sulfuric acid solution is not higher than 30%. The aluminum chloride is crystalline powder.
Claims (10)
1. A double liquid grouting material for soft soil subgrade reinforcement, characterized in that the double liquid grouting material is formed by mixing component À and component B; the component À consists of the following materials in parts by weight: 20-50 parts of ordinary portland cement, 20-50 parts of fine sand,
0.8-2.0 parts of silica fume, 0.2-0.5 part of water reducing agent, 0.02-0.05 part of triethanolamine and 12-30 parts of water; component B: 15-45 parts of water glass, 4-10 parts of dilute sulfuric acid and 0.1-0.3 part of aluminum chloride.
2. The double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the weight ratio of the component A to the component B is between 2:1 and 6:1.
3. The double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the ordinary portland cement is PO42.5 R ordinary cement, and the fine sand has a particle size of 0.3-1.18 mm.
4. The double liquid grouting material for soft soil subgrade reinforcement according to claim 2, characterized in that the mass ratio of cement to fine sand is 1:1.
5. The double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the silica fume is micro silica powder with an average particle size of 0.1 um, a specific surface area of 21 m°/g, a SiO, content of more than 90% and a water content of less than 2%.
6. The double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the water reducing agent is an early strength water reducing agent, which is at least one of polycarboxylate superplasticizer and naphthalene water reducing agent.
7. The double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the water glass is sodium silicate, the Baume degree of the solution is not less than 38°Be', and the modulus is 3.0.
8. The double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the concentration of dilute sulfuric acid solution is not higher than 30%.
9. The double liquid grouting material for soft soil subgrade reinforcement HUS01802 according to claim 1, characterized in that the aluminum chloride is crystalline powder.
10. The method for preparing the double liquid grouting material for soft soil subgrade reinforcement according to claim 1, characterized in that the method is realized by the following steps: (1) preparation of component A: adding 20-50 parts of cement and 0.8-2.0 parts of silica fume into 20-50 parts of fine sand, stirring uniformly, and then adding 12-30 parts of water, 0.2-0.5 part of water reducing agent and 0.02-0.05 part of triethanolamine, and continuously stirring uniformly to obtain the product; (2) preparation of component B: adding 4-10 parts of dilute sulfuric acid into 15-45 parts of water glass, stirring evenly, and then adding 0.1-0.3 part of aluminum chloride, and continuously stirring uniformly to obtain the product; (3) fully mixing the slurry of the component A and the slurry of the component B at the filling position by a mixer of a double liquid grouting pump under the pressure of 4-10 MPa, and the mixed slurry is in a fluid state; initial setting is completed within 6 min 45 s, and final setting is completed within 7 min 30 s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU501302A LU501302B1 (en) | 2022-01-21 | 2022-01-21 | Double liquid grouting material for soft soil subgrade reinforcement and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU501302A LU501302B1 (en) | 2022-01-21 | 2022-01-21 | Double liquid grouting material for soft soil subgrade reinforcement and method |
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| LU501302B1 true LU501302B1 (en) | 2022-07-21 |
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| LU501302A LU501302B1 (en) | 2022-01-21 | 2022-01-21 | Double liquid grouting material for soft soil subgrade reinforcement and method |
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| LU (1) | LU501302B1 (en) |
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2022
- 2022-01-21 LU LU501302A patent/LU501302B1/en active IP Right Grant
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Effective date: 20220721 |