GB2446412A - Heating structure for hair dryers - Google Patents

Heating structure for hair dryers Download PDF

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Publication number
GB2446412A
GB2446412A GB0702602A GB0702602A GB2446412A GB 2446412 A GB2446412 A GB 2446412A GB 0702602 A GB0702602 A GB 0702602A GB 0702602 A GB0702602 A GB 0702602A GB 2446412 A GB2446412 A GB 2446412A
Authority
GB
United Kingdom
Prior art keywords
holder
hair dryers
och3
heating structure
ceramic
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.)
Withdrawn
Application number
GB0702602A
Other versions
GB0702602D0 (en
Inventor
Carlos Jose Ceva
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.)
Duna Enterprises SA
Original Assignee
Duna Enterprises SA
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 Duna Enterprises SA filed Critical Duna Enterprises SA
Priority to GB0702602A priority Critical patent/GB2446412A/en
Publication of GB0702602D0 publication Critical patent/GB0702602D0/en
Publication of GB2446412A publication Critical patent/GB2446412A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/30—Electric circuitry specially adapted for hair drying devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0423—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between hand-held air guns
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H05B3/265—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an inorganic material, e.g. ceramic
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H05B3/283—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an inorganic material, e.g. ceramic

Abstract

A heating structure for hair dryers comprises a heating element having a holder made of non-flammable insulating material to hold a double wire spiral resistor 6, both the holder and resistor being coated with a layer 14 of inorganic water based paint comprising a liquid part that forms a ceramic of the sol-gel type and another part that emits electromagnetic far-infrared radiation. Electric circuit connection terminals 7, 8, 9 are fixed in the holder. The liquid part comprises metal hydroxides or metal alkoxides and the other part comprises light metal oxide. Said metal alkoxides can be chosen among A13 n-butoxyl, A13 isopropoxide, Ca(OCH3)2, Al(OCH3)3, Si(OCH3)4, Mn(OCH3)4, Fe2 methoxide, Fe3 ethoxide Na terbutoxide, and the like. The part that emits far-infrared radiation has a wavelength that ranges between 1 and 3 microns, and can chosen to be made of said oxides and also of carbides: Si, Zr, Mo and the like; nitrides: Al, Ti, Si, B, and the like; borides: Al, Ba, Ca and the like; sulphides: Mo, and the like; and graphite. Holder may be made of mica or ceramic, and comprises of two plates 1, 2 arranged in cross form with notches 3 to receive the wire 6.

Description

"Heating structure for hair dryers" The present invention relates
generally to hair dryers, and it particularly refers to a heating structure intended to provide an effective construction, which allows the optimal use of the electric energy expended to heat it.
The main purpose of the present invention is the construction of a heater intended for hair dryers, in which its heating resistor is coated with a ceramic material and a compound that emits far-infrared radiation.
A further advantage of this invention lies in the nature of the heating resistor coating, which has a particularly greater power of emission within the frequencies that are away from the infrared radiation produced.
It has mainly been developed with a simple structure intended to be applied to the construction of heating resistors, especially to those which require highly safe conditions for daily use, such is the case of hand-held hair dryers, both at home or at the hairdresser's. Apart from the benefits of emitting far-infrared waves, they provide an optimal use of the electric energy consumed.
Another purpose is to provide a proper resistive coating for the heater which protects it from the corrosion caused by environmental agents, such as humidity and vapours coming from products used at home, and mainly, at the hairdresser's, for conditioning and dying the hair.
PRIOR ART:
As is known, near-infrared rays produce electromagnetic waves that can cause several problems to the human body. The most common is the appearance of cataracts. Some of their harmful effects can be used under medical control, taking into account the operating conditions and exposure period, such as the case of sun-baths, in which all the radiation frequencies take place.
Far-infrared rays mean that their main effect is the thermal agitation and the production of resonance waves which originate resonance absorption phenomena that are not harmful, and whose vibration is good for the metabolism, benefits the blood circulation within the capillary vessels, and stimulates the normal functions of the nervous and hormonal systems as well as the immune system.
In a previous work, a radiator was obtained by winding a heating wire round a ceramic tube. It was proved, by means of said work, that there was plenty of the thermal radiation produced by said product in far-infrared frequencies, therefore, several devices were developed. Within the prior art, there are numerous applications, which have been conceived for the production of heating units for several uses. Among them, the following patents can be listed: Patent US 4804823, which consists in a "Ceramic heater". The heat generator is a resistor placed inside a ceramic holder, with terminals connected at both ends of the resistor. The substrate is made of sintered nitrite selected from the group of silicon and aluminium, while the resistor is made of titanium nitrite (TiN) and tungsten carbonate (WC).
Patent US 6236027 "Ceramic heater". This invention provides a ceramic heater comprising a core, an insulation layer and a resistance heating element of high-melting metal embedded between the core and the insulation layer, wherein the operating temperature is not less than 300 C. The insulation layer comprises a sintered compact composed of 88 to 95 weight % of Al203, supplemented, as sintering aids, with 3 to 10 weight % of Si2 and 0.4 to 1.0 weight % of MgO and 1.0 to 2.5 weight % of CaO, having a density of not less than 3.60 and a thickness of 100 to 300 microns.
Patent US 6762396 "Deposited resistive coatings". This invention involves coatings deposited on a substrate including a layer having a selected resistivity. The resistive layer can serve as a heat source in a variety of applications and can be fabricated using an arc plasma spraying procedure.
These patents are part of the prior art and due to their characteristics, they do not interfere with the purpose of the present invention.
In order to solve the above-mentioned problem in the easiest and most economical form, the applicant has obtained a heater especially prepared to be used in hair dryers, so that all the properties of far-infrared emission are used for conditioning the hair while drying it. This device was unknown until its incorporation in this kind of appliances of daily and essential use at home.
The product can be summarized as follows: A coating is applied to the heating element, which conventionally comprises a holder made of non-flammable insulating material, such as mica, ceramic, or another similar element, and normally consists of two rhomboidal plates arranged in cross form. These plates are several times higher than their width and have numerous notches on their edges as well as quadrangular extensions sticking out from both ends.
The resistor is made up of a double wire spiral commonly used for this kind of devices. It is wound around the holder arranged in cross form, being conveniently spaced when going through the above-mentioned notches.
The wire ends are fixed to the terminals set on the terminal plates, to which the wires that are part of the power circuit are fixed.
The whole set of spiral wires, which form the resistor and its holder, is coated with a water-based paint layer, which is completely inorganic and is cured by means of the process known as 501-geL This special ceramic coating has neither volatile organic compounds nor heavy metals, with an excellent resistance to corrosion and high temperatures. When it gets hot, it releases infrared rays within the infrared range.
Basically, the coating is made of a sort of paint consisting in two essential parts. The liquid part contains a material that forms ceramic by jellification, for instance, by means of polymerization through a sol-gel process; the other part emits far-infrared radiation.
Among the great variety of liquid compositions, which may form the ceramic layer, those that contain metal hydroxides, alkoxides and the like are referred to.
Among the metal alkoxides with general formula M(OR)n, the following ones can be considered: A13 n-butoxyl, A13 isopropoxide, Ca(OCH3)2, Al(OCH3)3, Si(OCH3)4, Mn(OCH3)4 methoxide Fe3 ethoxide Na terbutoxide, etc. There exist many formulas of liquid materials, which form ceramics by means of the sd-gel process. Their concentrations in the coating composition can vary from 10 to 80 % by weight, depending on the desired properties for the ceramic.
A paint that emits far-infrared rays is added to these compounds. It is made of inorganic elements, capable of emitting radiation within a wavelength between 3 and 1000 microns at a temperature of 500 C or higher.
Some oxides can be mentioned as examples: Al, Ti, Zr, Si, Fe, Ni, Mn; Co CR, Cu, Y; Zn, Mg; Ca and the like. There can also be carbides: Si, Zr, Mo and the like; nitrides: Al, Ti, Si, B, and the like; borides: Al, Ba, Ca and the like; sulphides: Mo, and the like; and also graphite.
The following compounds are some of those which represent this paint: Al2 03, Zr2 03, Co 0, Co3 04, Co3 04, Ni 0, Fe2 03, Si 02, Ti 02, Y2 05, Zn 0, Mn 02, Zr 02, Fe3 04, Cu 0, Cu2 0, Mg 0, Ca 0, Si 0, Zr C, Al B12, Ca B6, B N, A16 Si03, Si3 N4, Cu Mn 06, Co Al2 04, etc. These compounds can be used alone or in mixtures, sintering or melting them and then pulverizing them. They can be added to the material for producing ceramic within a proportion from 5 to 70 % by weight A colloidal substance, an inorganic fine powder or its mixture, is usually added to the compound in order to compact the composition.
The colloidal substance could comprise alumina, Ti or Zr oxides, SiZr, Al hydroxide, etc. and the inorganic fine powder could comprise alumina, Ti, Si Oxide, etc. The preferred embodiment of the invention will be more clearly understood by reference to the following detailed description and attached drawings. Various modifications to the components will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. Thus, the present invention is not intended to be limited to the embodiment shown but is to be accorded the widest scope consistent with the principles and features described herein.
DESCRIPTION OF THE DRAWINGS:
In the drawings attached to this technical and legal description, the following is shown: Fig. I illustrates a perspective view of the invention.
Fig. 2 is a bottom view illustrative of the heater.
DESCRIPTION OF THE PREFERRED EMBODIMENT:
According to the attached drawings, the heating element comprises a holder made of non-flammable insulating material such as mica, ceramic, or the like, and consists of two rhomboidal plates I and 2, arranged in cross form, which are several times higher than their width. The plates have numerous notches 3 on their edges as well as quadrangular extensions sticking out from both ends 4 and 5.
The resistor is made up of a double wire spiral 6 commonly used for this kind of device. It is wound around the holder arranged in cross form, being conveniently spaced when going through the above-mentioned notches 3.
The ends of wire 6 are fixed to terminals 7 and 8 set on the plates 1, while the other end of both wires 6 are fixed to a terminal 9 set on the plate 2.
Power circuit conductors 10 and II, independently of each wire 6, are connected to said terminals 7 and 8, while a conductor 12 of circuit return (not shown for being known) connects to the terminal 9 where both ends of the parallel conductors 6 meet.
All the wires 6 wound in parallel and forming the spiral 13 that constitutes the resistor over its holder in cross form, are coated with a water-based paint layer 14, which is completely inorganic and is cured by means of the process known as sol-gel, which can be chosen from among the examples stated in previous paragraphs.
This special ceramic coating has neither volatile organic compounds nor heavy metals. It has an excellent resistance to corrosion and high temperatures. It has an essential characteristic that lies in the fact that when it gets hot, it emits infrared rays within the far range.
As it is known, infrared rays that are near wavelengths, which can be seen by the human eye, are included within a wavelength range of 0.7 to 1 micron.
Far-infrared rays, which are the best for this type of device, can go beyond 3 microns; this is the chosen range for the emitting and protecting coating to be optimum.
The coating thickness 10 is about 8 to 12 microns.
OPERATION
Once the different components of the invention have been explained, there follow further descriptions adding the functional and operational relation between its parts and its outcome.
The operational relation is very simple. Once the wires 6 are spirally wound and the resistor 13 is built, it is coated with a ceramic layer for emission and protection, which is made by means of the sol-gel process. Thus, the coated resistor 14 is obtained.
As it is known, the double spiral is used to connect a temperature control, inserting one or both in the electric circuit.
According to this description, a heating element to be especially applied to hair dryers is obtained. By means of said element, the thermal radiation projected by it can be placed within the far-infrared range in the electromagnetic waves spectrum, thus optimizing the benefits of the hot air projected towards the user's hair.
Thus there has been described one of the possibilities of construction that lead to carry out the invention as well as the way it works, and also its specific application. This description is completed with a summary of the invention contained in the claim clauses that appear thereinafter:

Claims (8)

1.-Heating structure for hair dryers, characterized in that the heating element comprises a holder made of non-flammable insulating material, which holds a resistor comprising a double wire spiral, having the electric circuit connection terminals fixed in said holder; the spiral and its holder being coated with a layer of inorganic water-based paint, comprising a liquid part that contains a material which forms a ceramic of the sol-gel type, such as metal hydroxides, metal alkoxides and the like, and another part that emits electromagnetic radiation in far-infrared range, made of a light metal oxide.
2.-Heating structure for hair dryers, according to claim 1, characterized in that said metal alkoxides can be chosen from among Al3 n-butoxyl, Al3 isopropoxide, Ca(OCH3)2, Al(OCH3)3, Si(OCH3)4, Mn(OCH3)4, Fe2 methoxide, Fe3 ethoxide Na terbutoxide, and the like.
3.-Heating structure for hair dryers, according to claims I and 2, characterized in that said another part that emits far-infrared radiation can chosen to be made of said oxides and also of carbides: Si, Zr, Mo and the like; nitrides: Al, Ti, Si, B, and the like; borides: Al, Ba, Ca and the like; sulphides: Mo, and the like; and graphite.
4.-Heating structure for hair dryers, according to claims 1, 2 and 3, characterized in that said holder, made of non-flammable insulating material, which holds the heating resistor, consists of two plates arranged in cross form.
5.-Heating structure for hair dryers, according to claims I and 4, characterized in that said holder made of insulating material, can be made of mica or ceramic.
6.-Heating structure for hair dryers, according to claims I and 5, characterized in that said heating element coating has neither volatile organic compounds nor heavy metals, with an excellent resistance to corrosion and high temperatures.
7.-Heating structure for hair dryers, according to claims 1 and 6, characterized in that said far-infrared radiation has a wavelength that ranges between I and 3 microns.
8.-Heating structure for hair dryers, according to claims I and 7, characterized in that said coating has a thickness of about 12 microns.
GB0702602A 2007-02-09 2007-02-09 Heating structure for hair dryers Withdrawn GB2446412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0702602A GB2446412A (en) 2007-02-09 2007-02-09 Heating structure for hair dryers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0702602A GB2446412A (en) 2007-02-09 2007-02-09 Heating structure for hair dryers

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GB0702602D0 GB0702602D0 (en) 2007-03-21
GB2446412A true GB2446412A (en) 2008-08-13

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2161511A1 (en) * 2007-06-25 2010-03-10 Kam Tao Lo Energy saving electric heating fan and the making method of its electric heating element
CN101765252A (en) * 2009-09-10 2010-06-30 董晓波 Electrothermal film heater based on metal substrate
WO2014183289A1 (en) * 2013-05-13 2014-11-20 Luo Yeli Energy-saving electric hair dryer
WO2016207821A1 (en) * 2015-06-26 2016-12-29 HOSPISTYLE di Trapani Maria Hairdryer with high electrical safety
EP3078294A4 (en) * 2013-12-03 2017-04-26 Ya-Man Ltd. Dryer
CN107676970A (en) * 2017-11-10 2018-02-09 常熟市梅李合金材料有限公司 Using the air heating apparatus of heating wire
EP3553411A1 (en) * 2018-04-09 2019-10-16 Zhejiang Prulde Electric Appliance Co., Ltd. Heating core for hot air gun and hot air gun
CN110411216A (en) * 2019-08-02 2019-11-05 中国原子能科学研究院 Zirconia oxygen analyzer heating furnace
GB2605628A (en) * 2021-04-08 2022-10-12 Dyson Technology Ltd A haircare appliance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB867476A (en) * 1959-03-14 1961-05-10 Eisemann Gmbh Improvements in or relating to electric hairdriers
WO2005051042A1 (en) * 2003-11-20 2005-06-02 Koninklijke Philips Electronics N.V. Thin- film heating element
US20050145617A1 (en) * 2004-01-06 2005-07-07 Mcmillin James Combined material layering technologies for electric heaters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB867476A (en) * 1959-03-14 1961-05-10 Eisemann Gmbh Improvements in or relating to electric hairdriers
WO2005051042A1 (en) * 2003-11-20 2005-06-02 Koninklijke Philips Electronics N.V. Thin- film heating element
US20050145617A1 (en) * 2004-01-06 2005-07-07 Mcmillin James Combined material layering technologies for electric heaters

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2161511A1 (en) * 2007-06-25 2010-03-10 Kam Tao Lo Energy saving electric heating fan and the making method of its electric heating element
EP2161511A4 (en) * 2007-06-25 2010-12-15 Kam Tao Lo Energy saving electric heating fan and the making method of its electric heating element
CN101765252A (en) * 2009-09-10 2010-06-30 董晓波 Electrothermal film heater based on metal substrate
CN101765252B (en) * 2009-09-10 2013-09-25 董晓波 Electrothermal film heater based on metal substrate
WO2014183289A1 (en) * 2013-05-13 2014-11-20 Luo Yeli Energy-saving electric hair dryer
EP3078294A4 (en) * 2013-12-03 2017-04-26 Ya-Man Ltd. Dryer
WO2016207821A1 (en) * 2015-06-26 2016-12-29 HOSPISTYLE di Trapani Maria Hairdryer with high electrical safety
CN107676970A (en) * 2017-11-10 2018-02-09 常熟市梅李合金材料有限公司 Using the air heating apparatus of heating wire
WO2019091316A1 (en) * 2017-11-10 2019-05-16 常熟市梅李合金材料有限公司 Air heating device with electric heating wires
EP3553411A1 (en) * 2018-04-09 2019-10-16 Zhejiang Prulde Electric Appliance Co., Ltd. Heating core for hot air gun and hot air gun
CN110411216A (en) * 2019-08-02 2019-11-05 中国原子能科学研究院 Zirconia oxygen analyzer heating furnace
GB2605628A (en) * 2021-04-08 2022-10-12 Dyson Technology Ltd A haircare appliance
WO2022214783A1 (en) * 2021-04-08 2022-10-13 Dyson Technology Limited A haircare appliance

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