BE898253A - Sound-absorbing construction element. - Google Patents
Sound-absorbing construction element. Download PDFInfo
- Publication number
- BE898253A BE898253A BE2/60260A BE2060260A BE898253A BE 898253 A BE898253 A BE 898253A BE 2/60260 A BE2/60260 A BE 2/60260A BE 2060260 A BE2060260 A BE 2060260A BE 898253 A BE898253 A BE 898253A
- Authority
- BE
- Belgium
- Prior art keywords
- sheet
- fibers
- perforations
- passage
- element according
- Prior art date
Links
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 239000011148 porous material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 239000011111 cardboard Substances 0.000 claims 1
- 239000004922 lacquer Substances 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 239000002023 wood Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 239000011490 mineral wool Substances 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 230000037368 penetrate the skin Effects 0.000 description 1
- 238000005293 physical law Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B1/8409—Sound-absorbing elements sheet-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8457—Solid slabs or blocks
- E04B2001/8461—Solid slabs or blocks layered
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8457—Solid slabs or blocks
- E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
- E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Textile Engineering (AREA)
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
L'invention a trait à un élément de construction insonorisant comportant un panneau muni d'une multitude de perforations ou de fentes. Elle est caractérisée par le fait qu'une nappe de fibres enchevetrées est appliquée à ce panneau de manière à y etre fixée inséparablement en tous les points et à etre tendue au-dessus des perforations comme une peau de tambour, de manière à y augmenter la résistance au passage de l'air, qui détermine le pouvoir d'insonorisation de l'élément de construction.The invention relates to a sound-absorbing construction element comprising a panel provided with a multitude of perforations or slots. It is characterized by the fact that a sheet of entangled fibers is applied to this panel so as to be fixed therein inseparably at all points and to be stretched over the perforations like a drum skin, so as to increase the resistance to the passage of air, which determines the soundproofing power of the building element.
Description
<Desc/Clms Page number 1>
formulée par
Hans Julius SCHMITT pour "Elément de construction insonorisant"
EMI1.1
o comme
BREVET D'INVENTION.
Priorité de la demande de brevet déposée en Allemagne (Rép.
Féd.) le 20 novembre 1982 sous le n P 32 42 940. 1, au nom du Demandeur.
<Desc/Clms Page number 2>
"Elément de construction insonorisant" La présente invention a trait à un élément de construction insonorisant se présentant sous forme de panneau à perforations ou à fentes.
On connaît depuis longtemps des éléments de constructions sous forme de panneaux à perforations ou à fentes, faits de tôle mince ou d'autres matériaux analogues, doublés d'une couche de feutre de fibres de verre ou de laine de roche et employés dans l'aménagement intérieur des bâtiments comme éléments de faux-plafonds d'insonorisation.
Le pouvoir insonorisant, des éléments de construction de ce genre, basé sur leur pouvoir d'absorption des ondes sonores, dépend de plusieurs facteurs, parmi lesquels surtout le rapport dit"section libre", qui est le rapport entre la partie de la surface occupée par les ouvertures et la surface totale, ainsi que l'épaisseur de la couche de feutre insonorisante et la distance entre le faux-plafond d'insonorisation et le revêtement brut non insonorisé du plafond.
Or, les couches ou garnitures de fibres de verre ou de laine de roche de ces éléments de construction insonorisants connus présentent l'inconvénient, d'une part, d'un prix relativement élevé et, d'autre part, d'un montage laborieux effectué au niveau du plafond et donc cher par suite du fait que la main-d'oeuvre employée dans la construction du bâtiment est des mieux payées.
Un autre inconvénient sérieux consiste en ce que la mise en oeuvre des feutres d'insonorisation concernés
<Desc/Clms Page number 3>
est fort désagréable et même nuisible pour la santé par suite de la fragilité des petites fibres de verre ou de laine de roche, qui se cassent facilement et pénètrent dans la peau de la main des ouvriers avec risque d'y provoquer des inflammations, ainsi que dans les muqueuses de la cavité nasale, buccale ou pharyngienne, qui sont ainsi facilement irritées.
En outre, les matières premières servant à la fabrication des revêtements de feutre de fibres de verre ou de laine de roche doivent être fondus et transformés en des fibres suffisamment fines par des procédés compliqués et peu économiques, évidemment au détriment du prix de revient.
Or, la présente invention a pour objet la réalisation d'un élément de construction d'insonorisation sous forme d'un panneau à perforations ou fentes, dépourvu des inconvénients susmentionnés des éléments connus de ce genre.
Le problème ainsi posé est résolu par un ensemble de caractéristiques essentielles révélées dans la première des revendications formulées ci-après, dont les revendications suivantes ont trait à d'autres caractéristiques de l'invention.
La résistance opposée au passage de l'air par les revêtements feutres d'insonorisation habituels peut par la solution préconisée par l'invention et basée sur des lois physiques, peu prises en considération jusqu'à présent, être réalisée et dotée de l'efficacité requise à des effets de construction par la réunion de panneaux minces perforés, de préférence faits de tôle, avec des matériaux poreux, tels que le papier, une nappe de fibres, des matières textiles ou autres, et cela de manière que ces matériaux sont tendus au niveau des perforations comme une peau de tambour. La résistance ainsi opposée au passage de l'air peut être variée à volonté par l'application de charges de produits appropriés sur la nappe de fibres.
Une réduction nette du prix de revient des éléments de con-
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struction selon l'invention s'obtient grâce au fait qu'ils sont déjà dotés au cours de leur production industrielle du pouvoir d'insonorisation dont ils doivent faire preuve lors de leur mise en oeuvre dans la pratique, c'est-à-dire au chantier de construction.
L'effet d'insonorisation exercé par l'élément de construction selon l'invention par absorption des ondes sonores s'obtient grâce au fait que se crée, au niveau des perforations recouvertes d'une nappe de fibres tendue comme une peau de tambour, une certaine résistance s'opposant à la propagation de ces ondes, par laquelle leur énergie est absorbée et dissipée et, par conséquent, le bruit gênant est plus ou moins réduit suivant une loi mathématique bien définie de l'acoustique. Les perforations de l'élément de construction selon l'invention agissent comme des tuyères, dont l'effet est renforcé par la nappe de fibres y appliquée, par laquelle les perforations du panneau sont plus ou moins obstruées. Cet effet, qui rappelle un effet de tuyère, se trouve ainsi en relation directe avec l'abaissement du niveau sonore dans l'espace environnant.
La résistance opposée au passage de l'air par l'élément de construction selon l'invention et, de ce fait, l'absorption des ondes sonores peuvent être efficacement variées dans des gammes de fréquences définies, par des interventions judicieusement choisies sur la nappe de fibres tendue comme une peau de tambour, telles que, par exemple, l'application par vaporisation de produits sur la nappe qui réduisent la lumière des pores entre les fibres de la nappe et augmentent ainsi la résistance opposée par la nappe au courant d'air passant par les pores.
La variation de la section libre de l'élément d'insonorisation à perforations selon l'invention et un traitement correspondant de la nappe de fibres tendue sur les perforations permettent d'atteindre facilement le niveau d'insonorisation des revêtements ou garnitures conventionnels composés de fi-
<Desc/Clms Page number 5>
bres de verre ou de laine de roche déjà à une épaisseur d'environ 30 mm, mais l'élément de construction selon l'invention a de préférence une épaisseur inférieure à 1 mm, et exerce le même effet, voire un meilleur effet qu'une nappe d'insonorisation de fibres de verre ou de laine de roche habituelle, épaisse de 30 mm.
Le principe fondamental de la solution selon l'invention est illustré ci-après par la description d'un exemple de mise en oeuvre donnée avec référence au dessin annexé, où la figure 1 représente en vue de dessus une partie d'un élément de construction insonorisant selon l'invention, et la figure 2 représente en coupe l'élément de construc- tion selon la figure 1.
On voit que l'élément de construction selon l'invention ici décrit et représenté se compose d'un élément de base sous forme d'un panneau de tôle mince 1 muni d'une pluralité de perforations et recouvert d'une nappe de fibres 2 à petites mailles tendue et y fixée. L'espacement 3 et le diamètre 4 des perforations sont choisis en fonction de la résistance opposée au passage de l'air par les perforations, qui est définie simultanément avec celle opposée par la nappe de fibres 2.
<Desc / Clms Page number 1>
formulated by
Hans Julius SCHMITT for "Sound-absorbing building element"
EMI1.1
o like
PATENT.
Priority of the patent application filed in Germany (Resp.
Fed.) On November 20, 1982 under No. P 32 42 940. 1, in the name of the Claimant.
<Desc / Clms Page number 2>
"Sound-absorbing building element" The present invention relates to a sound-absorbing building element in the form of a perforated or slit panel.
Structural elements have long been known in the form of perforated or slit panels, made of thin sheet metal or other similar materials, lined with a layer of fiberglass or rock wool felt and used in interior design of buildings as elements of false ceilings for soundproofing.
The sound-absorbing power of building elements of this kind, based on their power to absorb sound waves, depends on several factors, among which especially the so-called "free section" ratio, which is the ratio between the part of the surface occupied through the openings and the total surface area, as well as the thickness of the soundproofing felt layer and the distance between the soundproofing suspended ceiling and the raw, non-soundproofed covering of the ceiling.
However, the layers or linings of glass fibers or rock wool of these known sound-absorbing construction elements have the disadvantage, on the one hand, of a relatively high price and, on the other hand, of a laborious assembly. performed at ceiling level and therefore expensive due to the fact that the labor employed in the construction of the building is of the best paid.
Another serious drawback is that the implementation of the soundproofing felts concerned
<Desc / Clms Page number 3>
is very unpleasant and even harmful to health due to the fragility of small glass fibers or rock wool, which break easily and penetrate the skin of workers' hands with the risk of causing inflammation, as well as in the mucous membranes of the nasal, oral or pharyngeal cavity, which are thus easily irritated.
In addition, the raw materials used in the manufacture of felt coatings of glass fibers or rock wool must be melted and transformed into sufficiently fine fibers by complicated and inexpensive processes, obviously to the detriment of the cost price.
However, the object of the present invention is the production of a soundproofing construction element in the form of a perforated or slit panel, devoid of the above-mentioned drawbacks of known elements of this kind.
The problem thus posed is solved by a set of essential characteristics revealed in the first of the claims formulated below, the following claims of which relate to other characteristics of the invention.
The resistance opposed to the passage of air by the usual soundproofing felt coatings can by the solution recommended by the invention and based on physical laws, little taken into consideration until now, be achieved and endowed with efficiency required for construction purposes by joining thin perforated panels, preferably made of sheet metal, with porous materials, such as paper, a web of fibers, textile materials or the like, and this in such a way that these materials are stretched at the perforations like a drum skin. The resistance thus opposed to the passage of air can be varied at will by the application of loads of suitable products on the sheet of fibers.
A net reduction in the cost price of the components
<Desc / Clms Page number 4>
struction according to the invention is obtained by virtue of the fact that they are already endowed during their industrial production with the power of soundproofing which they must demonstrate during their implementation in practice, that is to say at the construction site.
The soundproofing effect exerted by the building element according to the invention by absorption of sound waves is obtained thanks to the fact that is created, at the level of the perforations covered with a sheet of fibers stretched like a drum skin, a certain resistance opposing the propagation of these waves, by which their energy is absorbed and dissipated and, consequently, the annoying noise is more or less reduced according to a well defined mathematical law of acoustics. The perforations of the building element according to the invention act as nozzles, the effect of which is reinforced by the sheet of fibers applied thereto, by which the perforations of the panel are more or less obstructed. This effect, which is reminiscent of a nozzle effect, is thus in direct relation with the lowering of the noise level in the surrounding space.
The resistance opposed to the passage of air through the building element according to the invention and, therefore, the absorption of sound waves can be effectively varied within defined frequency ranges, by judiciously chosen interventions on the sheet. fibers stretched like a drum skin, such as, for example, the application by spraying of products on the sheet which reduce the light of the pores between the fibers of the sheet and thus increase the resistance opposed by the sheet to the current air passing through the pores.
The variation in the free section of the soundproofing element with perforations according to the invention and a corresponding treatment of the sheet of fibers stretched over the perforations makes it possible to easily reach the level of soundproofing of conventional coverings or linings composed of fi -
<Desc / Clms Page number 5>
glass or rock wool already at a thickness of around 30 mm, but the building element according to the invention preferably has a thickness of less than 1 mm, and has the same effect, or even a better effect, than a soundproofing sheet of glass fibers or usual rock wool, 30 mm thick.
The fundamental principle of the solution according to the invention is illustrated below by the description of an example of implementation given with reference to the attached drawing, in which FIG. 1 represents a view from above of part of a building element. soundproofing according to the invention, and Figure 2 shows in section the construction element according to Figure 1.
It can be seen that the building element according to the invention described and shown here consists of a basic element in the form of a thin sheet metal panel 1 provided with a plurality of perforations and covered with a sheet of fibers 2 with small mesh stretched and fixed. The spacing 3 and the diameter 4 of the perforations are chosen as a function of the resistance opposed to the passage of air through the perforations, which is defined simultaneously with that opposed by the sheet of fibers 2.
Claims (12)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823242940 DE3242940A1 (en) | 1982-11-20 | 1982-11-20 | ACOUSTICALLY EFFECTIVE COMPONENT |
Publications (1)
Publication Number | Publication Date |
---|---|
BE898253A true BE898253A (en) | 1984-03-16 |
Family
ID=6178567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE2/60260A BE898253A (en) | 1982-11-20 | 1983-11-18 | Sound-absorbing construction element. |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE898253A (en) |
CH (1) | CH662385A5 (en) |
DE (1) | DE3242940A1 (en) |
FR (1) | FR2536444A1 (en) |
GB (1) | GB2133431B (en) |
NL (1) | NL8303897A (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE461048B (en) * | 1987-03-02 | 1989-12-18 | Gyproc Ab | PERFORED, SOUND-ABSORBING DISC |
SE500334C2 (en) * | 1990-02-08 | 1994-06-06 | Rockwool Ab | Curved acoustic element |
DE4008861A1 (en) * | 1990-03-20 | 1991-10-02 | Friedrich Priehs | SOUND INSULATION COMPONENT |
US5175401A (en) * | 1991-03-18 | 1992-12-29 | Grumman Aerospace Corporation | Segmented resistance acoustic attenuating liner |
GB2257994B (en) * | 1991-07-03 | 1994-11-30 | Hunter Douglas Ind Bv | Sound absorbent building material |
DE4335654C2 (en) * | 1993-10-15 | 1997-01-23 | Herbst Donald | Sound absorbing building board |
US5832685A (en) * | 1995-08-03 | 1998-11-10 | Hermanson; Lars S. | Self-supporting interior surface panel |
GB2306984B (en) * | 1995-11-09 | 2000-01-26 | Cas Architects Limited | External walling of a building |
ATE288001T1 (en) | 2000-03-20 | 2005-02-15 | Newmat Sa | FLEXIBLE POLYMER FILM FOR STRETCHED STRUCTURES, METHOD FOR THE PRODUCTION THEREOF AND SUBSTRATE CEILING WITH THIS FILM |
DE102008020941B4 (en) * | 2008-04-25 | 2020-09-24 | Ventomaxx Gmbh | Air guiding element for supplying and / or removing air |
DE102008025840A1 (en) * | 2008-05-29 | 2009-12-03 | Volkswagen Ag | Device for sound absorption and sound damping, has resonance absorber fleece, where each layer consists of acoustically transparent knitting fleece |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7209560U (en) * | 1972-06-15 | Kiss G | Self-supporting ceiling element for preferably suspended ceiling systems | |
BE483695A (en) * | 1945-09-19 | |||
GB664729A (en) * | 1949-07-15 | 1952-01-09 | Gyproc Products Ltd | Improvements in and relating to acoustic tiles or panels |
GB905437A (en) * | 1961-02-01 | 1962-09-05 | William George Kemp | Improvements in acoustical panels and in structures employing such panels |
DE1900301U (en) * | 1964-05-05 | 1964-09-10 | Vogt Bueromoebel | WALL PLATE. |
DE6916548U (en) * | 1969-04-17 | 1969-09-18 | Borgers Johann Kg | SOUND SUCTION PLATE |
GB1327874A (en) * | 1970-11-05 | 1973-08-22 | Daempa As | Accoustic ceilings |
DE2161674A1 (en) * | 1971-12-13 | 1973-06-28 | Saleen Ges Mbh & Co | SOUND ABSORBING PLATE |
CA991375A (en) * | 1972-11-10 | 1976-06-22 | James C. Ollinger | Carpet-faced wallboard |
US3887031A (en) * | 1973-06-11 | 1975-06-03 | Lockheed Aircraft Corp | Dual-range sound absorber |
DE2438987A1 (en) * | 1974-08-14 | 1976-02-26 | Helmut Dr Schmidt | Multi layers sound absorbing plate with rigid covering - has foam plastics sound absorbing core and outer casing with holes in it |
US4084366A (en) * | 1975-11-14 | 1978-04-18 | Haworth Mfg., Inc. | Sound absorbing panel |
DK4379A (en) * | 1979-01-04 | 1980-07-05 | Daempa As | SOUND ABSORPTION UNIT |
DE2930123A1 (en) * | 1979-07-25 | 1981-02-12 | Wilhelmi Holzwerk | SOUND-absorbing building board |
DE3029938C2 (en) * | 1979-09-21 | 1982-08-12 | Armstrong World Industries, Inc., 17604 Lancaster, Pa. | Process for the production of a sound-absorbing wall panel |
DE2947607C2 (en) * | 1979-11-26 | 1985-01-24 | Fa. Carl Freudenberg, 6940 Weinheim | Airborne sound-absorbing cladding for a wall or ceiling |
-
1982
- 1982-11-20 DE DE19823242940 patent/DE3242940A1/en not_active Withdrawn
-
1983
- 1983-11-08 FR FR8317749A patent/FR2536444A1/en active Pending
- 1983-11-11 GB GB08330165A patent/GB2133431B/en not_active Expired
- 1983-11-14 NL NL8303897A patent/NL8303897A/en not_active Application Discontinuation
- 1983-11-18 BE BE2/60260A patent/BE898253A/en not_active IP Right Cessation
- 1983-11-18 CH CH6220/83A patent/CH662385A5/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3242940A1 (en) | 1984-05-24 |
GB8330165D0 (en) | 1983-12-21 |
GB2133431B (en) | 1987-01-21 |
FR2536444A1 (en) | 1984-05-25 |
GB2133431A (en) | 1984-07-25 |
CH662385A5 (en) | 1987-09-30 |
NL8303897A (en) | 1984-06-18 |
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RE20 | Patent expired |
Owner name: *SCHMITT HANS JULIUS Effective date: 20031118 |