# US 8,770,344 B2 · Acoustic panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,344 B2 - Document ID: US8770344B2 - Status: Granted - Kind: B2 - Application number: 13/809,540 - Filed: 2011-07-12 - Published: 2013-05-30 - Granted: 2014-07-08 - Earliest claimed: 2010-07-13 - Assignees: Bellmax Acoustic Pty Ltd. - Applicants: Mark Borroni - Inventors: Mark Borroni - Web page: https://patentgrep.com/patent/US8770344B2 ## CPC - E04F 13/00: Coverings or linings, e.g. for walls or ceilings (flooring E04F15/00; decoration of surfaces, mosaic work B44, e.g. paper-hanging B44C7/00; made of webs, e.g. of fabrics or wallpaper {, as such, or their manufacturing} D03D, D04G, D04H, D06N, D21H; construction of {false} ceilings E04B9/00; roofings or similar water-tight coverings against precipitation E04D) - B32B 3/266: {characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12} - B32B 5/022: {Non-woven fabric} - B32B 5/18: characterised by features of a layer {of} foamed material - B32B 15/046: {of foam} - B32B 15/14: next to a fibrous or filamentary layer - B32B 27/065: {of foam} - B32B 27/12: next to a fibrous or filamentary layer - B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF} - B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers} - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 29/007: {next to a foam layer} - B32B 29/02: next to a fibrous or filamentary layer - E04B 1/86: slab-shaped - E04B 9/001: {characterised by provisions for heat or sound insulation} - E04B 9/0464: {having irregularities on the faces, e.g. holes, grooves} - E04F 13/08: composed of a plurality of similar covering or lining elements, (E04F13/072 takes precedence; borders, skirtings E04F19/02; {of webs or fabrics E04F13/002; fixing strips E04F19/06; separate provisional spacers between adjacent tiles E04F21/0092; implements or means for setting tiles E04F21/18}) - E04F 13/0867: {having acoustic absorption means on the visible surface} - G10K 11/168: Plural layers of different materials, e.g. sandwiches - G10K 11/172: using resonance effects - B32B 2262/0276: Polyester fibres - B32B 2262/105: Ceramic fibres - B32B 2307/102: Insulating - B32B 2307/518: bi-axially - B32B 2307/71: Resistive to light or to UV - B32B 2307/72: Density - B32B 2307/732: Dimensional properties - B32B 2419/00: Buildings or parts thereof - B32B 2605/00: Vehicles - B32B 2607/00: Walls, panels - E04B 2001/8461: {layered} - E04B 2001/8476: {with acoustical cavities, with or without acoustical filling} - E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) - 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 ## Abstract A multilayered acoustic panel (1) including: a substantially air impermeable outer membrane layer (3); an underlying second portion bonded to the membrane layer (3), the second portion including an intermediate layer (5); and an inner layer (7) underlying the second portion, the inner layer (7) having a plurality of apertures (6) therein, said apertures (6) being covered by the intermediate layer (5) of the second portion, wherein the membrane layer (3) and second portion are not bonded together where the membrane layer (3) overlies the apertures (6) such that those portions of the membrane layer (3) which overlie the apertures (6) are free to vibrate independently of the second portion in response to sound waves incident on the membrane layer (3). ## Claims ### Claim 1 A multilayered acoustic panel including: a substantially air impermeable outer membrane layer; an underlying second portion bonded to the membrane layer, the second portion including an intermediate layer; and an inner layer underlying the second portion, the inner layer having a plurality of apertures therein, said apertures being covered by the intermediate layer of the second portion, wherein the membrane layer and second portion are not bonded together where the membrane layer overlies the apertures such that those portions of the membrane layer which overlie the apertures are free to vibrate independently of the second portion in response to sound waves incident on the membrane layer. ### Claim 2 (depends on 1) A multilayered acoustic panel as claimed in claim 1 wherein each portion of the membrane layer which overlies an aperture defines a diaphragm which is able to vibrate in response to sound waves incident on the membrane layer. ### Claim 3 (depends on 2) A multilayered acoustic panel as claimed in claim 2 wherein an air gap is defined between the membrane layer and the second portion where each portion of the membrane layer overlies an aperture. ### Claim 4 (depends on 3) A multilayered acoustic panel as claimed in claim 3 wherein an air gap is defined between the membrane layer and the intermediate layer where each portion of the membrane layer overlies an aperture. ### Claim 5 (depends on 4) A multilayered acoustic panel as claimed in claim 4 wherein the intermediate layer is slightly depressed into the apertures to thereby provide said air gaps. ### Claim 6 (depends on 5) A multilayered acoustic panel as claimed in claim 5 wherein the air gaps have a maximum depth of approximately 1 to 4 mm. ### Claim 7 (depends on 2) A multilayered acoustic panel as claimed in claim 2 wherein the intermediate layer of the second portion is bonded to the membrane layer but is not bonded to those portions of the membrane layer which define the diaphragms. ### Claim 8 (depends on 7) A multilayered acoustic panel as claimed in claim 7 wherein the second portion further includes an adhesive layer positioned between the intermediate layer and the inner layer. ### Claim 9 (depends on 1) An acoustic panel as claimed in claim 1 wherein the intermediate layer is made of a fibrous material or a foam material. ### Claim 10 (depends on 1) An acoustic panel as claimed in claim 1 wherein the inner layer is a sound absorbing layer made of a fibrous material or a foam material. ### Claim 11 (depends on 1) An acoustic panel as claimed in claim 1 wherein the intermediate layer is made of a non porous material. ### Claim 12 (depends on 1) An acoustic panel as claimed in claim 1 wherein the membrane layer is made of a polymer film. ### Claim 13 (depends on 1) An acoustic panel as claimed in claim 1 wherein the membrane layer has a surface density of less than approximately 100 g/m2.