# US 9,752,794 B2 · Curvilinear sound absorber

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- Number: US 9,752,794 B2
- Document ID: US9752794B2
- Status: Granted
- Kind: B2
- Application number: 15/034,999
- Filed: 2014-12-17
- Published: 2016-09-29
- Granted: 2017-09-05
- Earliest claimed: 2013-12-23
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Dino Perin
- Web page: https://patentgrep.com/patent/US9752794B2

## CPC

- F24F 13/0263: {Insulation for air ducts}
- F24F 13/24: Means for preventing or suppressing noise
- F24F 2013/242: {Sound-absorbing material}
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)

## Abstract

Baffle assemblies capable of reducing noise transmission while admitting airflow are provided, for use in air passages such as an inlet or exit of a duct, housing, enclosure or partition. The baffle assemblies comprise S-shaped baffle sections comprising two curved baffle units arranged so as to provide an S-shaped passage. In some embodiments the curved baffle units include a curved portion and at least one flange portion. In some embodiments the curved baffle units have a shape capable of manufacture by a continuous extrusion process.

## Claims

### Claim 1

A baffle assembly for use in an inlet or exit of a duct, housing, enclosure or partition, comprising an S-shaped baffle section comprising two curved baffle units arranged so as to provide an S-shaped passage, wherein at least one curved baffle unit directly contacts an adjacent curved baffle unit and further wherein the one curved baffle unit and adjacent curved baffle unit have respective concave faces that are collinearly opposed.

### Claim 2 (depends on 1)

The baffle assembly according to claim 1 comprising at least two S-shaped baffle sections each comprising two curved baffle units arranged so as to provide an S-shaped passage.

### Claim 3 (depends on 2)

The baffle assembly according to claim 2 wherein at least two S-shaped baffle sections are arranged front-to-back in an “SS” configuration.

### Claim 4 (depends on 2)

The baffle assembly according to claim 2 wherein at least two S-shaped baffle sections are arranged front-to-front in “SZ” configuration.

### Claim 5 (depends on 2)

The baffle assembly according to claim 2 wherein at least two S-shaped baffle sections are arranged back-to-back in “ZS” configuration.

### Claim 6 (depends on 1)

The baffle assembly according to claim 1 wherein the curved baffle units bear an acoustically absorbing material.

### Claim 7 (depends on 6)

The baffle assembly according to claim 6 wherein the acoustically absorbing material is an acoustically absorbing non-woven material.

### Claim 8 (depends on 6)

The baffle assembly according to claim 6 wherein the acoustically absorbing material is an acoustically absorbing foam material.

### Claim 9 (depends on 6)

The baffle assembly according to claim 6 wherein the curved baffle units bear an acoustically absorbing material on their concave face.

### Claim 10 (depends on 6)

The baffle assembly according to claim 6 wherein the curved baffle units bear an acoustically absorbing material on their concave face only.

### Claim 11 (depends on 1)

The baffle assembly according to claim 1 wherein the curved baffle units include a curved portion and at least one flange portion.

### Claim 12 (depends on 11)

The baffle assembly according to claim 11 wherein the curved portion has a cross-section selected from the group consisting of semi-circular, nearly semi-circular, parabolic, nearly parabolic, hyperbolic, and nearly hyperbolic.

### Claim 13 (depends on 1)

The baffle assembly according to claim 1 wherein the curved baffle units have a shape capable of manufacture by a continuous extrusion process.

### Claim 14 (depends on 1)

The baffle assembly according to claim 1 wherein the curved baffle units are made by a continuous extrusion process.

### Claim 15 (depends on 1)

The baffle assembly according to claim 1 wherein the curved baffle units are constructed of polymer materials.