# US 10,765,191 B2 · Diffuser

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- Number: US 10,765,191 B2
- Document ID: US10765191B2
- Status: Granted
- Kind: B2
- Application number: 15/181,886
- Filed: 2016-06-14
- Published: 2016-12-22
- Granted: 2020-09-08
- Earliest claimed: 2015-06-16
- Assignees: Dyson Technology Limited
- Applicants: Dyson Technology Limited
- Inventors: Philip Jonathan Stephens; Stephen Farrar Smith
- Web page: https://patentgrep.com/patent/US10765191B2

## CPC

- A45D 20/122: {Diffusers, e.g. for variable air flow}
- A45D: HAIRDRESSING OR SHAVING EQUIPMENT (wigs, toupees or the like A41G3/00, A41G5/00; hairdressers' chairs A47C1/04; hair cutting appliances, razors B26B); EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING

## Abstract

A diffuser includes an air inlet for receiving an airflow from a hair dryer, a grille having a plurality of air outlets for emitting a first part of the airflow from the diffuser, and a plurality of projections upstanding from the grille for contacting the hair of a user and for emitting a second part of the airflow. Each of the projections has a respective air outlet located in an end portion of the projection which is remote from the grille. The projections are divided into a first set of projections and a second set of projections arranged about the first set of projections. The air outlets of the first set of projections are arranged to emit air towards the second set of projections, and the air outlets of the second set of projections face are arranged to emit air towards the first set of projections.

## Claims

### Claim 1

A diffuser for attachment to an airflow outlet end of a hair dryer, the diffuser comprising:
at least one air inlet for receiving an airflow from the hair dryer;
a grille comprising a plurality of air outlets for emitting a first part of the airflow from the diffuser; and
a plurality of projections upstanding from the grille for contacting hair of a user and for emitting a second part of the airflow, each of the projections comprising a single air outlet located in an end portion of the projection which is remote from the grille;
wherein the plurality of projections comprises a first set of projections and a second set of projections arranged around the first set of projections, and wherein the single air outlets of the first set of projections are arranged to emit air towards the second set of projections, and the single air outlets of the second set of projections are arranged to emit air towards the first set of projections, and
wherein a first projection of the first set of projections and a second projection of the second set of projections are aligned along a radial line extending from a longitudinal axis of the diffuser and intersecting the first and second projections, and the single air outlet of the first projection faces outwardly away from the longitudinal axis toward the second projection so that the radial line extends through a center of the single air outlet of the first projection.

### Claim 2 (depends on 1)

The diffuser of claim 1, wherein the first set of projections are arranged in a first annular array, and the second set of projections are arranged in a second annular array extending around the first annular array.

### Claim 3 (depends on 2)

The diffuser of claim 2, wherein the annular arrays are concentric.

### Claim 4 (depends on 2)

The diffuser of claim 2, wherein, within each annular array, the projections are equally angularly spaced.

### Claim 5 (depends on 1)

The diffuser of claim 1, wherein the single air outlets of the first set of projections are arranged to emit air in a radially outward direction, and the single air outlets of the second set of projections are arranged to emit air in a radially inward direction.

### Claim 6 (depends on 1)

The diffuser of claim 1, wherein each of the first set of projections is arranged to emit air towards a respective one of the second set of projections.

### Claim 7 (depends on 1)

The diffuser of claim 1, wherein the number of projections in the second set of projections is greater than the number of projections in the first set of projections.

### Claim 8 (depends on 1)

The diffuser of claim 1, wherein, within the second set of projections, alternate projections are arranged to emit air towards a respective one of the first set of projections.

### Claim 9 (depends on 1)

The diffuser of claim 1, wherein each projection has a tip which is remote from the grille and a length extending in a direction extending from the grille to the tip, the air single outlet of the projection having a length which is at least one third of the length of the projection.

### Claim 10 (depends on 1)

The diffuser of claim 1, wherein the single air outlet of each projection has a length which is at least one half of the length of the projection.

### Claim 11 (depends on 1)

The diffuser of claim 1, wherein the at least one air inlet is spaced from the longitudinal axis of the diffuser.

### Claim 12 (depends on 1)

The diffuser of claim 1, wherein the at least one air inlet comprises at least one slot.

### Claim 13 (depends on 12)

The diffuser of claim 12, wherein the at least one air inlet comprises an annular slot.