AU721059B2 - Arrangement for damping sound and a method for manufacturing the arrangement - Google Patents
Arrangement for damping sound and a method for manufacturing the arrangement Download PDFInfo
- Publication number
- AU721059B2 AU721059B2 AU54136/96A AU5413696A AU721059B2 AU 721059 B2 AU721059 B2 AU 721059B2 AU 54136/96 A AU54136/96 A AU 54136/96A AU 5413696 A AU5413696 A AU 5413696A AU 721059 B2 AU721059 B2 AU 721059B2
- Authority
- AU
- Australia
- Prior art keywords
- damping
- visco
- elastic polymer
- sheet
- achieving
- 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.)
- Ceased
Links
- 238000013016 damping Methods 0.000 title claims description 71
- 238000000034 method Methods 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229920000642 polymer Polymers 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 20
- 230000002745 absorbent Effects 0.000 claims description 18
- 239000002250 absorbent Substances 0.000 claims description 18
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 description 7
- 230000001680 brushing effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000010426 asphalt Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0815—Acoustic or thermal insulation of passenger compartments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
Description
Arrangement for damping sound and a method for manufacturing the arrangement The present invention relates to a damping mass for achieving a sound-damping absorbent effect in a structure, especially those containing car stereo loudspeakers.
A damping mass of this kind is characterized in that the damping mass comprises a visco-elastic polymer which is applied to one side of the structure, thereby achieving damping of vibrations and resonances in the structure. The application can be by means of spraying, coating, brushing, spreading or rolling.
The present invention also relates to a damping mass for achieving a sound-damping absorbent effect in structures containing car stereo loudspeakers.
It is customary in the manufacture of bass reflex cabinets, interior door trim panels and other
'A
•panels intended for the installation of loudspeaker units to make use of so-called MDF board .or particle board of a certain thickness, for example up to approx. 25 mm, in order to achieve *ot a sufficiently stable resonance chamber that is as resonance-free as possible. Heavy internal 15 bracing of the structure is also frequently used in addition in order to reduce reverberation inside the cabinet.
Bitumen matting and various forms of expanded polyethylene sheeting are commonly used in s. the conventional damping of vibrations, resonances and noise in vehicle bodywork. These are ormally installed by applying adhesive on one side and then shaping them piece by piece and gluing them securely to the inside of the bodywork.
However, the aforementioned previously disclosed method is not associated with a very high dissipation factor in the materials used, in addition to which the structures are heavy and complicated to produce.
The principal object of the present invention is thus, in the first instance, to make available a damping mass which, amongst other things, solves the aforementioned problems.
The aforementioned object is achieved by means of a damping mass in accordance with the present invention, which is characterized essentially in that the damping layer comprises a visco-elastic polymer exhibiting an adhesive function sandwiched between two sheet-formed elements to form a composite sheet which, through the absorbent effect of the visco-elastic 4x polymer on the resulting sandwich structure when the damping layer is subjected to shear deformation during oscillation, brings about a reduction in unwanted vibrations, resonances and reverberations in the structure formed by the sheet.
Alternatively, the damping mass comprisinga visco-elastic polymer is applied to the inside of a vehicle body, whereby damping of vibrations and resonances in the body is achieved.
The present invention also relates to a method for manufacturing a damping mass for achieving a sound-damping absorbent effect in structures, comprising the step of applying to one side of the surface of the structure a visco-elastic polymer so that damping is achieved of vibrations and resonances in the structure.
The methods for producing the previously disclosed structures containing car stereo loudspeakers in order to achieve a sound-damping absorbent effect are complicated and time-consuming and are not so effective.
A further object of the invention is thus, in the first instance, to make available a method which, amongst other things, solves the aforementioned problems simply and effectively.
C
A method for manufacturing a damping mass for achieving a sound-damping absorbent effect in structures containing car stereo loudspeakers, comprising the steps of: applying a smooth layer of a visco-elastic polymer to one or both of two S.sheet-formed elements, and then *see pressing the sheet elements together by exerting uniform pressure in °conjunction with drying of said layer, whereupon the resulting sandwich sheet is used for the installation of car loudspeaker units.
An alternative method is characterized in that the inside surface of a vehicle body of the kind in question is sprayed or coated by means of a visco-elastic polymer to achieve damping of vibrations and resonances in the bodywork.
The invention is described below as a number of preferred illustrative embodiments, in conjunction with which reference is made to the accompanying drawings, where: Fig. 1 shows a sectional view of a sandwich sheet produced in accordance with the invention, and Fig 2 shows a sectional view of a vehicle body with damping mass applied.
The function of the invention is as follows: A body in equilibrium requires the input of very little energy to bring it into resonant oscillation and, as such, to radiate unwanted noise. The amplitude of the oscillation is dependent on the dissipation factor of the material the ability to transform oscillation energy into heat). Structural materials such as MDF and particle board have a dissipation factor of 0.01-0.03, i.e. very low dissipation. The application of the invention increases the dissipation factor by a factor of 15 to 20, which gives reduced radiation of unwanted noise by approx. 15 dB. The reverberation period of the chamber is also reduced considerably. When working with car audio, it is important to damp any resonances. The invention reduces the resonances in the chamber structure in a previously entirely unachievable fashion by the simply expedient of reducing the vibrations where they are at their strongest in the actual material of the chamber. The result is a completely "dead" chamber.
It is possible to stick two sheets together with damping mass instead of using a single thick sheet, and still to obtain a stable sound without reverberation in the chamber disturbing the sound picture.
A damping mass 1 for obtaining a sound-damping absorbent effect in structures containing car stereo loudspeakers comprises a sandwich structure formed by a visco-elastic polymer 2 exhibiting an adhesive function which is applied by spraying, brushing, rolling or spreading between two sheet-formed elements 3, 4 to form a composite sheet. The sheet 1 brings about a reduction in unwanted vibrations, resonances and reverberations in the structure formed from the sheet I through the absorbent effect of the visco-elastic polymer on the sandwich structure formed when the damping layer is exposed to shear deformation during oscillation.
The visco-elastic damping mass 2 exhibiting an adhesive function consists of an acrylic polymer.
The sheet-formed elements 3, 4 exhibit essentially identical thicknesses T, for example 12 mm.
A distinctly increased dissipation factor is achieved in this way in the material used, which also leads to improved acoustic functions for the structures in which the damping adhesive 2 is used. Significant reductions in resonances and vibrations are also achieved, as well as reduced weight for the finished structure through a reduced requirement for structural stiffening.
A damping mass 5 for obtaining a sound-damping absorbent effect in structures containing car stereo loudspeakers involves a damping mass 6, in the form of a visco-elastic polymer, Sbeing capable of application to the inside 7A of a vehicle body 7 by spraying or coating, whereby damping of vibrations and resonances in the body 7 is achieved. The damping mass 6 in this case consists of a plastic dispersion with inorganic filling agents, preferably polyvinyl propionate.
The effect achieved through the aforementioned arrangement 5 with the visco-elastic damping mass 6 corresponds to the effect achieved with conventional bitumen matting of up to about times the thickness. The mass 6 is also applied in a significantly shorter time than when installing bitumen matting on a corresponding surface.
The cost of the damping mass 6 is also considerably lower than for conventional damping with bitumen matting. Increased fire protection and a lower overall weight are also achieved.
The method for manufacturing a damping mass 1 which exhibits a sandwich construction in order to obtain a sound-damping absorbent effect in structures containing car stereo loudspeakers involves gluing together two sheet-formed elements 3, 4, e.g. MDF sheets, by means of a visco-elastic polymer 2 which is applied by spraying, brushing, rolling or spreading on at least one sheet element 3 or 4 to produce a smooth layer. The sheet elements 3, 4 are 15 then pressed together by exerting uniform pressure in conjunction with drying of said layer 2, .for approx. 6-8 hours, whereupon the resulting sandwich sheet 1 is used for the installation of car loudspeaker units.
t :*It is preferable to glue together two sheets 3, 4 which exhibit identical thickness T by means of an acrylic polymer.
o: 20 The layer thickness t can be varied, although an appropriate value is preferably approx. 1 mm.
The drying time may vary, although an appropriate time is approx. 6-8 hours at room temperature.
A considerable reduction in the reverberation periods of the finished structure is achieved :oo :thanks to the absorbent effect of the damping adhesive. Measurements have shown that an undamped sheet has a reverberation period up to approx. 300% longer than the damped version in accordance with the present invention. A resonance-free loudspeaker chamber is thus obtained simply and effectively.
A method for manufacturing a damping mass 5 intended to achieve a sound-damping absorbent effect in structures containing car stereo loudspeakers in the case of body-mounting Tinvolves spraying or coating the inside surface 7A of a vehicle body 7 by means of a 0 visco-elastic polymer, so that damping is achieved of vibrations and resonances in the body 7.
A damping mass 6 of the intended kind comprisinga plastic dispersion containing inorganic filling agents, namely polyvinyl propionate, is appropriately applied by spraying or brushing to a desired thickness X, preferably approx. 1 mm. Said damping mass 6 is then allowed to dry at room temperature.
More specifically the intended damping mass 6 is applied by spraying with a low-pressure sprayer or compressed air or by brushing onto the surface 7A of the body or other vehicle panel components 7 that have been previously cleaned of grease and dirt.
Drying can continue for 8-12 hours, depending on the temperature, and also following application on vertical surfaces.
The damping mass 6 can be finished, once it has dried, by both sanding and painting.
The word 'comprising' and forms of the word 'comprising' as used in this description and in the claims does not limit the invention claimed to exclude any variations or additions.
The invention is not restricted to the illustrative examples described above and shown in the drawing, but may be modified within the scope of theClaims without departing from the idea 15 of invention.
S
S
Claims (15)
1. A damping mass for achieving a sound-damping absorbent effect in a structure comprising a visco-elastic polymer which is, in use, applied to one side (7A) of the structure thereby achieving damping of vibrations and resonances in the structure
2. A damping mass according to claim 1 wherein the visco-elastic polymer is a plastic dispersion with inorganic filling agents.
3. A damping mass according to claim 1 wherein the plastic dispersion with inorganic filling agents is polyvinyl propionate.
4. A damping layer for achieving a sound-damping absorbent effect in structures containing car stereo loudspeakers, characterized in that the damping layer comprises a visco-elastic polymer (20) exhibiting an adhesive function which is sandwiched between two sheet-formed elements 4) to form a composite sheet which, through the absorbent effect of the visco-elastic polymer on the resulting sandwich 15 structure when the damping layer is subjected to shear deformation during •oscillation, brings about a reduction in unwanted vibrations, resonances and reverberations in the structure formed by the sheet.
5. A damping layer according to claim 4 characterized in that the visco-elastic polymer o* is an acrylic polymer. 20
6. A damping layer according to either of claims 4 or 5 characterized in that the too* "sheet-formed elements 4) have essentially identical thicknesses
7. A damping layer according to claim 6 wherein the thickness of the sheet-formed elements is 12 mm.
8. A damping mass for achieving a sound-damping absorbent effect in structures containing car stereo loudspeakers wherein the damping mass comprises a visco-elastic polymer which is, in use, applied to the inside (7A) of a vehicle body thereby achieving damping of vibrations and resonances in the body
9. A method for manufacturing a damping mass for achieving a sound-damping absorbent effect in structures ,comprising the step of applying to one side of the surface (7A) of the structure a visco-elastic polymer so that damping is achieved of vibrations and resonances in the structure.
A method according to claim 10 further characterized in that the visco-elastic polymer is applied to a desired thickness and then allowed to dry at room temperature.
11. A method according to any one of Claims 9 or 10, characterized in that the visco-elastic polymer comprises a plastic dispersion containing inorganic filling agents.
12. A method according to claim 11 wherein the plastic dispersion containing inorganic filling agents is polyvinyl propionate.
13. A method for manufacturing a damping mass for achieving a sound-damping absorbent effect in structures containing car stereo loudspeakers, comprising the steps of: applying a smooth layer of a visco-elastic polymer to one or both of two sheet-formed elements and then pressing the sheet elements 4) together by exerting uniform pressure in conjunction with drying of said layer, whereupon the resulting sandwich sheet is used for the installation of car loudspeaker units.
14. A method for manufacturing a damping mass according to claim 13 wherein the visco-elastic polymer is an acrylic polymer.
15. A method for manufacturing a damping mass according to either of Claims 13 or 14, 20 characterized in that the two sheets 4)have an essentially identical thickness *oo
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9501555 | 1995-04-26 | ||
| SE9501555A SE505791C2 (en) | 1995-04-26 | 1995-04-26 | Sound damping partic. for car contg. stereo loudspeakers uses mass of viscoelastic polymer |
| SE9501754 | 1995-05-11 | ||
| SE9501754A SE9501754D0 (en) | 1995-04-26 | 1995-05-11 | Apparatus for providing sound attenuating absorbent effect of structures and method for providing apparatus |
| PCT/SE1996/000538 WO1996034261A1 (en) | 1995-04-26 | 1996-04-24 | Arrangement for damping sound and a method for manufacturing the arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU5413696A AU5413696A (en) | 1996-11-18 |
| AU721059B2 true AU721059B2 (en) | 2000-06-22 |
Family
ID=26662284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU54136/96A Ceased AU721059B2 (en) | 1995-04-26 | 1996-04-24 | Arrangement for damping sound and a method for manufacturing the arrangement |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0823043A1 (en) |
| JP (1) | JPH11504135A (en) |
| AU (1) | AU721059B2 (en) |
| BR (1) | BR9608179A (en) |
| CA (1) | CA2219785A1 (en) |
| SE (1) | SE9501754D0 (en) |
| WO (1) | WO1996034261A1 (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2770364B3 (en) * | 1997-10-28 | 2000-04-07 | Frederic Ivaldi | TUBULAR ACOUSTIC SPEAKER |
| DE19909046B4 (en) * | 1999-03-02 | 2005-04-14 | Faist Automotive Gmbh & Co. Kg | Acoustic multilayer absorber, process for its preparation and its use |
| JP2005026817A (en) * | 2003-06-30 | 2005-01-27 | Pioneer Electronic Corp | On-board speaker apparatus and door panel |
| US7181891B2 (en) | 2003-09-08 | 2007-02-27 | Quiet Solution, Inc. | Acoustical sound proofing material and methods for manufacturing same |
| US8495851B2 (en) | 2004-09-10 | 2013-07-30 | Serious Energy, Inc. | Acoustical sound proofing material and methods for manufacturing same |
| US7921965B1 (en) | 2004-10-27 | 2011-04-12 | Serious Materials, Inc. | Soundproof assembly and methods for manufacturing same |
| US7909136B2 (en) | 2004-11-24 | 2011-03-22 | Serious Materials, Inc. | Soundproof assembly |
| US7798287B1 (en) | 2005-01-20 | 2010-09-21 | Serious Materials, Inc. | Acoustical ceiling panels |
| US8029881B2 (en) | 2005-11-04 | 2011-10-04 | Serious Energy, Inc. | Radio frequency wave reducing material and methods for manufacturing same |
| US7987645B2 (en) | 2007-03-29 | 2011-08-02 | Serious Materials, Inc. | Noise isolating underlayment |
| US9388568B2 (en) | 2007-04-06 | 2016-07-12 | Pacific Coast Building Products, Inc. | Acoustical sound proofing material with improved fracture characteristics and methods for manufacturing same |
| US7883763B2 (en) | 2007-04-12 | 2011-02-08 | Serious Materials, Inc. | Acoustical sound proofing material with controlled water-vapor permeability and methods for manufacturing same |
| US8424251B2 (en) | 2007-04-12 | 2013-04-23 | Serious Energy, Inc. | Sound Proofing material with improved damping and structural integrity |
| US7745005B2 (en) | 2007-06-30 | 2010-06-29 | Serious Materials, Inc. | Acoustical sound proofing material |
| US8181738B2 (en) | 2007-04-24 | 2012-05-22 | Serious Energy, Inc. | Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same |
| US8397864B2 (en) | 2007-04-24 | 2013-03-19 | Serious Energy, Inc. | Acoustical sound proofing material with improved fire resistance and methods for manufacturing same |
| US10174499B1 (en) | 2007-05-01 | 2019-01-08 | Pacific Coast Building Products, Inc. | Acoustical sound proofing material for architectural retrofit applications and methods for manufacturing same |
| US9387649B2 (en) | 2007-06-28 | 2016-07-12 | Pacific Coast Building Products, Inc. | Methods of manufacturing acoustical sound proofing materials with optimized fracture characteristics |
| US7908818B2 (en) | 2008-05-08 | 2011-03-22 | Serious Materials, Inc. | Methods of manufacturing acoustical sound proofing materials with optimized fracture characteristics |
| US7914914B2 (en) | 2007-06-30 | 2011-03-29 | Serious Materials, Inc. | Low embodied energy sheathing panels with optimal water vapor permeance and methods of making same |
| US7799410B2 (en) | 2007-06-30 | 2010-09-21 | Serious Materials, Inc. | Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same |
| US8337993B2 (en) | 2007-11-16 | 2012-12-25 | Serious Energy, Inc. | Low embodied energy wallboards and methods of making same |
| US8590272B2 (en) | 2010-06-07 | 2013-11-26 | Georgia-Pacific Gypsum Llc | Acoustical sound proofing materials and methods of making the same |
| CA2988547C (en) | 2016-12-15 | 2021-01-26 | Certainteed Gypsum, Inc. | Plaster boards and methods for making them |
| FI3687791T3 (en) | 2017-09-26 | 2023-12-12 | Certainteed Gypsum Inc | Plaster boards having internal layers and methods for making them |
| CA3076910C (en) | 2017-09-28 | 2023-09-19 | Certainteed Gypsum, Inc. | Plaster boards and methods for making them |
| US11214962B2 (en) | 2017-09-30 | 2022-01-04 | Certainteed Gypsum, Inc. | Tapered plasterboards and methods for making them |
| FR3080540A1 (en) * | 2018-04-26 | 2019-11-01 | Alexandre Balloge | TARGET FOR PALLET GAME AND METHOD OF CURING ITS COATING |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3110369A (en) * | 1959-05-22 | 1963-11-12 | Wright Barry Corp | Self-damped laminar structure |
| DE1201083B (en) * | 1962-04-12 | 1965-09-16 | Alois Stankiewicz Chemische Er | Process for the production of a component provided with a multilayer covering for damping body-borne sound vibrations |
| US3424270A (en) * | 1965-05-12 | 1969-01-28 | Us Plywood Champ Papers Inc | Viscoelastic sound-blocking material with filler of high density particles |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3215225A (en) * | 1961-11-29 | 1965-11-02 | Korfund Dynamics Corp | Laminated acoustic panels with outer metal layers, fibrous core and viscoelastic damping layer |
-
1995
- 1995-05-11 SE SE9501754A patent/SE9501754D0/en unknown
-
1996
- 1996-04-24 EP EP96911174A patent/EP0823043A1/en not_active Withdrawn
- 1996-04-24 AU AU54136/96A patent/AU721059B2/en not_active Ceased
- 1996-04-24 BR BR9608179A patent/BR9608179A/en not_active IP Right Cessation
- 1996-04-24 WO PCT/SE1996/000538 patent/WO1996034261A1/en not_active Application Discontinuation
- 1996-04-24 CA CA 2219785 patent/CA2219785A1/en not_active Abandoned
- 1996-04-24 JP JP8532434A patent/JPH11504135A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3110369A (en) * | 1959-05-22 | 1963-11-12 | Wright Barry Corp | Self-damped laminar structure |
| DE1201083B (en) * | 1962-04-12 | 1965-09-16 | Alois Stankiewicz Chemische Er | Process for the production of a component provided with a multilayer covering for damping body-borne sound vibrations |
| US3424270A (en) * | 1965-05-12 | 1969-01-28 | Us Plywood Champ Papers Inc | Viscoelastic sound-blocking material with filler of high density particles |
Also Published As
| Publication number | Publication date |
|---|---|
| BR9608179A (en) | 1999-05-04 |
| CA2219785A1 (en) | 1996-10-31 |
| SE9501754D0 (en) | 1995-05-11 |
| WO1996034261A1 (en) | 1996-10-31 |
| JPH11504135A (en) | 1999-04-06 |
| EP0823043A1 (en) | 1998-02-11 |
| AU5413696A (en) | 1996-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC1 | Assignment before grant (sect. 113) |
Owner name: ESOTERIC AUDIO USA INC. Free format text: THE FORMER OWNER WAS: AUDIOFORM AB |
|
| FGA | Letters patent sealed or granted (standard patent) | ||
| PC | Assignment registered |
Owner name: MITEK CORPORATION Free format text: FORMER OWNER WAS: ESOTERIC AUDIO USA INC. |