US20170306166A1 - Acoustic Paint - Google Patents

Acoustic Paint Download PDF

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Publication number
US20170306166A1
US20170306166A1 US15/647,047 US201715647047A US2017306166A1 US 20170306166 A1 US20170306166 A1 US 20170306166A1 US 201715647047 A US201715647047 A US 201715647047A US 2017306166 A1 US2017306166 A1 US 2017306166A1
Authority
US
United States
Prior art keywords
paint
room
acoustic
powdered
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/647,047
Inventor
Theodore W. Denney, III
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uef Labs LLC
Original Assignee
Theodore W. Denney, III
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Theodore W. Denney, III filed Critical Theodore W. Denney, III
Priority to US15/647,047 priority Critical patent/US20170306166A1/en
Publication of US20170306166A1 publication Critical patent/US20170306166A1/en
Assigned to UEF LABS, LLC reassignment UEF LABS, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DENNEY, THEODORE W., III
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/032—Powdery paints characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C09D7/1216—
    • C09D7/1283—
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/66—Additives characterised by particle size
    • C09D7/69—Particle size larger than 1000 nm
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/20—Reflecting arrangements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

Definitions

  • This invention relates to an acoustic paint that can be applied to the walls of a room to improve the audible clarity of sound generated within the room and heard by a listener.
  • the acoustic paint includes a powdered piezoelectric or non-piezoelectric crystalline material having a resonant frequency which reacts to the sound to control the acoustics within the room.
  • a listener may find himself located within a room while listening to music or other audio content.
  • the sound is emitted from a speaker and transmitted unidirectionally to the listener. That is to, say, the listener may not know that he is surrounded by sound or that the sound is coming to him from different directions.
  • the sound can be absorbed or distorted by the walls of the room, such that the audible clarity of the sound is negatively impacted.
  • an acoustic paint is disclosed to be applied to some or all of the walls of a room to improve the acoustic characteristics of a room and the clarity (e.g., the warmth, richness and detail) of audible sound generated within the room and transmitted to the ear of a listener.
  • the acoustic paint includes a conventional wall treatment paint to serve as a thick base or foundation. A finely powdered piezoelectric or non-piezoelectric crystalline material is mixed into the paint foundation.
  • the powdered piezoelectric or non-piezoelectric material added to the paint foundation has a resonant frequency so as to be capable of reacting to the sound generated within the room in order to control the room acoustics depending upon the type of material and the resonant frequency thereof.
  • an optional electrically conductive catalyst can also be added to the paint foundation.
  • the catalyst may be either finely powdered graphite or graphene.
  • a preferred embodiment for an acoustic paint to be applied to the walls of a room to improve the acoustic characteristics of the room is now disclosed. That is, some or all of the walls of a room in which a source of audible sound is located are covered with the acoustic paint in order to improve the clarity of the sound generated in the room and detected by the ear of a listener.
  • the sound will appear to be warmer, richer and more detailed to the listener than had the walls of the room in which the listener is located not have been treated with the acoustic paint of this invention.
  • the sound will also appear to the listener to be realistic (i.e., live) and coming from different directions.
  • the acoustic paint includes a conventional oil-based or latex paint that is customarily applied to cover the walls of a room.
  • the paint serves as a relatively thick foundation to which acoustic control particles are added.
  • the paint may be either white or have a color to best suit the aesthetic requirements of the listener.
  • a piezoelectric or a non-piezoelectric material Prior to the application of the acoustic paint to the walls, either a piezoelectric or a non-piezoelectric material is mixed into the paint foundation.
  • a piezoelectric material to be mixed into the paint foundation is finely powdered quartz.
  • a non-piezoelectric material is added to the paint, it is preferable that such material be a finely powdered crystalline material.
  • non-piezoelectric crystalline materials that are suitable to be added to the paint foundation include calcite, tourmaline and carborundum.
  • the powdered piezoelectric or non piezoelectric material that is added to the paint foundation must have a resonant frequency so as to be able to react to the sound generated within the room.
  • the piezoelectric or non-piezoelectric material of the acoustic paint is adapted to control the room acoustics depending upon the type of material and the resonant frequency thereof.
  • an optional catalyst can also be added to the paint foundation.
  • the catalyst preferably has an electrically conductive characteristic.
  • the optional catalyst is a finely powdered graphite or graphene material.
  • the acoustic paint of this invention includes a mixture of the aforementioned paint foundation and the following constituents which are now described for each ounce of the paint foundation used to cover the walls of the room to be treated.
  • Added to each ounce of the paint foundation is 2.5 grams of fine crystalline powder.
  • the crystalline powder has an ideal particle size distribution of between 4.0 ⁇ m to 60 ⁇ m.
  • the electrically conductive catalyst that is added to the paint foundation is 0.15 grams of fine nano-graphite powder having an ideal particle size distribution between 0.25 ⁇ m to 5.0 ⁇ m.
  • the aforementioned components are stirred until they are uniformly mixed into the paint foundation.
  • the resultant acoustic paint mixture is then applied to the walls of the room as a primer and/or a finished coat by means of a paint brush, a roller, or the like.
  • the acoustic paint mixture described above includes thick paint base or foundation to bind the crystalline powder to the graphic powder.
  • other foundations having an adhesive characteristic e.g., a viscous glue
  • a viscous glue can be added to the paint foundation to help the combination crystalline powder and graphite powder adhere to each other and the walls of the room. It is also within the scope of this invention to coat wall paper with the acoustic paint and then cover the walls of the room with the acoustic paint treated wall paper.

Abstract

An acoustic paint to be applied to the walls of a room in which a source of audible sound is located to improve the acoustic characteristics of the room and correspondingly improve the clarity (e.g., the warmth, richness and detail) of the sound that is generated by the source and detected by the ear of a listener located within the room. The acoustic paint includes a paint foundation into which is mixed a powdered piezoelectric material or a powdered non-piezoelectric crystalline material having a resonant frequency so that the powdered material will react to the sound generated within the room and thereby control the room acoustics depending upon the type of material and the resonant frequency thereof. An optional catalyst, such as an electrically conductive powdered graphite or powdered graphene, is mixed into the paint foundation. The mixture is stirred and then applied to the walls of the room by means of a brush, a roller, or the like.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention
  • This invention relates to an acoustic paint that can be applied to the walls of a room to improve the audible clarity of sound generated within the room and heard by a listener. The acoustic paint includes a powdered piezoelectric or non-piezoelectric crystalline material having a resonant frequency which reacts to the sound to control the acoustics within the room.
    • 2. Background Art
  • A listener may find himself located within a room while listening to music or other audio content. In many cases, the sound is emitted from a speaker and transmitted unidirectionally to the listener. That is to, say, the listener may not know that he is surrounded by sound or that the sound is coming to him from different directions. Moreover, the sound can be absorbed or distorted by the walls of the room, such that the audible clarity of the sound is negatively impacted.
  • Therefore, it would be desirable to have an innocuous and aesthetically pleasing treatment to cover some or all of the walls of the room by which to control the acoustics in the room and improve the audible clarity (e.g., the warmth, richness and detail) of the sound heard by the listener whether or not speakers are used. In this same regard, it would also be desirable for the sound to appear to the listener to he more realistic (i.e., live) and coming to him from different directions within the room in which he is located.
    • SUMMARY OF THE INVENTION
  • In general terms, an acoustic paint is disclosed to be applied to some or all of the walls of a room to improve the acoustic characteristics of a room and the clarity (e.g., the warmth, richness and detail) of audible sound generated within the room and transmitted to the ear of a listener. The acoustic paint includes a conventional wall treatment paint to serve as a thick base or foundation. A finely powdered piezoelectric or non-piezoelectric crystalline material is mixed into the paint foundation. The powdered piezoelectric or non-piezoelectric material added to the paint foundation has a resonant frequency so as to be capable of reacting to the sound generated within the room in order to control the room acoustics depending upon the type of material and the resonant frequency thereof. To enhance the reaction of the piezoelectric or non-piezoelectric material to the sound, an optional electrically conductive catalyst can also be added to the paint foundation. By way of example, the catalyst may be either finely powdered graphite or graphene. The powdered piezoelectric or non-piezoelectric material and the powdered catalyst are uniformly mixed into the paint foundation, and the resulting acoustic paint mixture is then applied to the walls by a roller, brush or the like.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • There are no drawings in this application.
    • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • A preferred embodiment for an acoustic paint to be applied to the walls of a room to improve the acoustic characteristics of the room is now disclosed. That is, some or all of the walls of a room in which a source of audible sound is located are covered with the acoustic paint in order to improve the clarity of the sound generated in the room and detected by the ear of a listener. By virtue of the foregoing, the sound will appear to be warmer, richer and more detailed to the listener than had the walls of the room in which the listener is located not have been treated with the acoustic paint of this invention. The sound will also appear to the listener to be realistic (i.e., live) and coming from different directions.
  • The acoustic paint includes a conventional oil-based or latex paint that is customarily applied to cover the walls of a room. The paint serves as a relatively thick foundation to which acoustic control particles are added. The paint may be either white or have a color to best suit the aesthetic requirements of the listener. Prior to the application of the acoustic paint to the walls, either a piezoelectric or a non-piezoelectric material is mixed into the paint foundation. One example, of a piezoelectric material to be mixed into the paint foundation is finely powdered quartz. In the case where a non-piezoelectric material is added to the paint, it is preferable that such material be a finely powdered crystalline material. Examples of non-piezoelectric crystalline materials that are suitable to be added to the paint foundation include calcite, tourmaline and carborundum.
  • The powdered piezoelectric or non piezoelectric material that is added to the paint foundation must have a resonant frequency so as to be able to react to the sound generated within the room. To this end, the piezoelectric or non-piezoelectric material of the acoustic paint is adapted to control the room acoustics depending upon the type of material and the resonant frequency thereof.
  • To enhance the reaction of the piezoelectric or non-piezoelectric material of the acoustic paint to the sound within the room, an optional catalyst can also be added to the paint foundation. The catalyst preferably has an electrically conductive characteristic. By way of example only, the optional catalyst is a finely powdered graphite or graphene material.
  • By way of one particular example, the acoustic paint of this invention includes a mixture of the aforementioned paint foundation and the following constituents which are now described for each ounce of the paint foundation used to cover the walls of the room to be treated. Added to each ounce of the paint foundation is 2.5 grams of fine crystalline powder. As indicated above, the quality of the sound detected by the ear of the listener will be dependent upon the resonant frequency of the crystalline powder. The crystalline powder has an ideal particle size distribution of between 4.0 μm to 60 μm. The electrically conductive catalyst that is added to the paint foundation is 0.15 grams of fine nano-graphite powder having an ideal particle size distribution between 0.25 μm to 5.0 μm. The aforementioned components are stirred until they are uniformly mixed into the paint foundation. The resultant acoustic paint mixture is then applied to the walls of the room as a primer and/or a finished coat by means of a paint brush, a roller, or the like.
  • The acoustic paint mixture described above includes thick paint base or foundation to bind the crystalline powder to the graphic powder. However, other foundations having an adhesive characteristic (e.g., a viscous glue) can be added to the paint foundation to help the combination crystalline powder and graphite powder adhere to each other and the walls of the room. It is also within the scope of this invention to coat wall paper with the acoustic paint and then cover the walls of the room with the acoustic paint treated wall paper.

Claims (13)

1.-10. (canceled)
11. An acoustic paint to be applied to at least some of the walls of a room in which a source of audible sound is located in order to improve the acoustic characteristics of the room and thereby improve the clarity of the sound that is generated by the sound source and detected by a listener in the room, said acoustic paint comprising a paint foundation into which is mixed a finely powdered crystalline material having a particle size lying in a range between 4.0 μm to 60 μm.
12. The acoustic paint recited in claim 11, wherein said powdered crystalline material is a piezoelectric material.
13. The acoustic paint recited in claim 12, wherein said piezoelectric material is quartz.
14. The acoustic paint recited in claim 11, wherein said powdered crystalline material is one of a group of crystalline materials consisting of calcite, tourmaline and carborundum.
15. The acoustic paint recited in claim 11, further comprising an electrically conductive powdered catalyst that is mixed with the crystalline material into the paint foundation.
23. A surface treatment to be applied to a surface that is located in a room with a source of audible sound for improving an acoustic characteristic of the sound generated by said source, said surface treatment comprising an adhesive foundation into which is mixed a finely powdered crystalline material having a particle size lying in a range between 4.0 μm to 60 μm.
24. The surface treatment recited in claim 23, wherein said powdered crystalline material is a piezoelectric material.
25. The surface treatment recited in claim 24, wherein said piezoelectric material is quartz.
26. The surface treatment recited in claim 23, wherein said powdered crystalline material is one of a group of crystalline materials consisting of calcite, tourmaline and carborundum.
27. The surface treatment recited in claim 23, further comprising an electrically conductive powdered catalyst that is mixed with the crystalline material into the adhesive foundation.
28. The surface treatment recited in claim 23, wherein the electrically conductive powdered catalyst is one of either graphite or graphene.
29. The surface treatment recited in claim 27, wherein the powdered catalyst has a particle size in a range between 0.25 um to 5.0 um.
US15/647,047 2015-11-09 2017-07-11 Acoustic Paint Abandoned US20170306166A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/647,047 US20170306166A1 (en) 2015-11-09 2017-07-11 Acoustic Paint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/936,465 US9732234B2 (en) 2015-11-09 2015-11-09 Acoustic paint
US15/647,047 US20170306166A1 (en) 2015-11-09 2017-07-11 Acoustic Paint

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US14/936,465 Continuation US9732234B2 (en) 2015-11-09 2015-11-09 Acoustic paint

Publications (1)

Publication Number Publication Date
US20170306166A1 true US20170306166A1 (en) 2017-10-26

Family

ID=57517980

Family Applications (2)

Application Number Title Priority Date Filing Date
US14/936,465 Active US9732234B2 (en) 2015-11-09 2015-11-09 Acoustic paint
US15/647,047 Abandoned US20170306166A1 (en) 2015-11-09 2017-07-11 Acoustic Paint

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US14/936,465 Active US9732234B2 (en) 2015-11-09 2015-11-09 Acoustic paint

Country Status (9)

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US (2) US9732234B2 (en)
EP (1) EP3374438A1 (en)
JP (1) JP2019501269A (en)
KR (1) KR20180082494A (en)
AU (1) AU2016352913A1 (en)
CA (1) CA3008123A1 (en)
IL (1) IL259229A (en)
MX (1) MX2018005792A (en)
WO (1) WO2017083442A1 (en)

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CN108546470A (en) * 2018-05-09 2018-09-18 韶关航佳信息咨询有限公司 A kind of Acrylic Powder Coating and its preparation method and application

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US9732234B2 (en) * 2015-11-09 2017-08-15 Theodore W. Denney, III Acoustic paint
WO2018206858A1 (en) * 2017-05-11 2018-11-15 Buendia Jose Apparatus for automatic sound calibration
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WO2020065138A1 (en) * 2018-09-25 2020-04-02 Buendia Jose Quantum entanglement in the world of technologies
WO2020188155A1 (en) * 2019-03-18 2020-09-24 Jose Buendia Live sound by standing waves
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WO2020225490A1 (en) * 2019-05-07 2020-11-12 Buendia Jose Play of the permeability of the density-expansion space
WO2021144507A1 (en) * 2020-01-16 2021-07-22 BERRICHON, Claude-Annie Cleaning the electric/magnetic fields of the air

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Also Published As

Publication number Publication date
MX2018005792A (en) 2019-05-13
EP3374438A1 (en) 2018-09-19
CA3008123A1 (en) 2017-05-18
WO2017083442A1 (en) 2017-05-18
US9732234B2 (en) 2017-08-15
AU2016352913A1 (en) 2018-05-31
JP2019501269A (en) 2019-01-17
IL259229A (en) 2018-07-31
US20170130059A1 (en) 2017-05-11
KR20180082494A (en) 2018-07-18

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