NL2007223C2 - Panel for providing a front and/or backside for a cabinet for holding electrical equipment. - Google Patents

Panel for providing a front and/or backside for a cabinet for holding electrical equipment. Download PDF

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Publication number
NL2007223C2
NL2007223C2 NL2007223A NL2007223A NL2007223C2 NL 2007223 C2 NL2007223 C2 NL 2007223C2 NL 2007223 A NL2007223 A NL 2007223A NL 2007223 A NL2007223 A NL 2007223A NL 2007223 C2 NL2007223 C2 NL 2007223C2
Authority
NL
Netherlands
Prior art keywords
panel
mesh
diagonal
perforations
cabinet
Prior art date
Application number
NL2007223A
Other languages
Dutch (nl)
Inventor
Cornelis Albert Zwinkels
Original Assignee
Kgg Dataxenter Holding B V
Dataxenter Ip B V
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kgg Dataxenter Holding B V, Dataxenter Ip B V filed Critical Kgg Dataxenter Holding B V
Priority to NL2007223A priority Critical patent/NL2007223C2/en
Application granted granted Critical
Publication of NL2007223C2 publication Critical patent/NL2007223C2/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0213—Venting apertures; Constructional details thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20181—Filters; Louvers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20718—Forced ventilation of a gaseous coolant
    • H05K7/20736—Forced ventilation of a gaseous coolant within cabinets for removing heat from server blades

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Description

Panel for providing a front and/or backside for a cabinet for holding electrical equipment
FIELD OF THE INVENTION
5 The invention relates to cabinets for electronic equipment and to panels for such cabinets.
BACKGROUND OF THE INVENTION
Electrical equipment, in particular for professional use, is in a lot of use cases stored in 10 a cabinet with standardised dimensions. A preferred dimension is 19 inch - better known as 482,6 millimetres. Equipment is usually inserted by means of vertical rails provided near vertical corners of the data cabinet.
Electrical equipment and in particular computer equipment dissipates a significant 15 amount of energy. To enable proper working of the equipment and in particular of the semiconductor components of the equipment, cooling is required. A very common way of cooling is by means of circulation of air. Air is preferably provided at the front of the data cabinet, at the front of the equipment. In case equipment is to be stored securely in the data cabinet, any means to secure the equipment may obstruct an air flow for 2 0 cooling the equipment.
This is in particular the case when a data cabinet is closed by means of a door. The door may be provided with perforations, though perforations currently available appear not to let an air flow pass in a very efficient way. This means that a larger or stronger air 2 5 flow is required - requiring more energy - for cooling in case the front of the data cabinet is covered by a panel and in particular a door, also when this panel is provided with a mesh of perforations as currently available.
OBJECT AND SUMMARY OF THE INVENTION
30 It is preferred to provide a panel for a data cabinet that enables more efficient cooling by means of an airflow.
The invention provides in a first aspect a panel for providing a front and/or backside for a cabinet for holding electrical equipment, the panel comprising at least one mesh area 2 formed by parallelogram shaped perforations of the panel, the mesh area covering in total at least 50% of the panel, the parallelogram shapes having a first diagonal and a second diagonal.
5 With the front and/or backside being provided with such perforations, air flows more smoothly through the perforations in the panel or panel. The reason for this is that air that has passed through the mesh area is reshaped as a substantially evenly distributed and laminar air flow. This substantially evenly distributed and laminar air flow efficiently continues flowing in housing of equipment installed in the data cabinet through 10 ventilation openings. The flow of the air may be aided by means of fans in the equipment, an external air movement arrangement like a fan, other, or a combination thereof.
In an embodiment of the panel for providing a front and/or backside for a data cabinet, 15 the parallelogram shaped perforations are equilateral quadrilateral shaped perforations.
Simulations have demonstrated that such shape creates an optimal air flow of air that has passed the mesh.
2 0 In a further embodiment of the panel for providing a front and/or backside for a data cabinet, the first diagonal is shorter than the second diagonal.
A mesh with such perforations lets air pass through in a more efficient way than with square perforations.
25
In another embodiment of the panel for providing a front and/or backside for a data cabinet, the second diagonal is horizontally oriented.
Equipment in data cabinets is in most cases inserted with a horizontal orientation. For 3 0 efficiently cooling such equipment, a predominantly - though not solely - horizontally oriented laminar airflow is preferred. Such an airflow enters the equipment in an optimal way, resulting in efficient air cooling of equipment.
3
The invention provides in a second aspect a cabinet for holding electrical equipment, the cabinet comprising the panel according to any of the claims 1 through 9, the panel forming a front side of the data cabinet.
5 BRIEF DESCRIPTION OF THE DRAWINGS
The invention and embodiments thereof will now be further discussed in conjunction with Figures. In the Figures,
Figure 1 A: shows a data server cabinet with a closed door; 10
Figure 1 B: shows a data server cabinet without a door;
Figure 1 A: shows a further data server cabinet with a closed door; 15 Figure 2: shows a detailed view of a mesh for door for a data server cabinet;
Figure 3 A: shows a schematic air flow through a perforation of a mesh from a front side; 20
Figure 3 B: shows a schematic air flow through a perforation of a mesh in a first cross section view;
Figure 3 C: shows a schematic air flow through a perforation of a mesh in a 2 5 second cross section view;
Figure 4 A: shows a schematic air flow through a perforation of another mesh from a front side; 30 Figure 4 B: shows a schematic air flow through a perforation of another mesh in a first cross section view;
Figure 4 C: shows a schematic air flow through another perforation of a mesh in a second cross section view; 4
Figure 5: shows a schematic air flow through a perforation of a further mesh from a front side; 5 Figure 6 A: shows a detailed view of yet another mesh for door for a data server cabinet; and
Figure 6 B: shows a detailed view of yet a further mesh for door for a data server cabinet.
10
DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 A shows a data server cabinet 100 as an embodiment of the equipment housing cabinet according to the invention. The data server cabinet 100 may be a data server cabinet as disclosed by Dutch patent application NL2006026. The data server 15 cabinet 100 comprises a housing 110 comprising sidewalls and a top panel and a door 120 connected to the housing 110 by means of an upper hinge 132 and a lower hinge 134. The door 120 comprises a handle 142 for opening and locking the door 120 and a mesh 150 covering a large area of the door 120. The mesh 150 preferably covers at least 50% of the front area of the door 120.
20
Figure 1 B shows the data server cabinet 100 with the door 120 removed. At the front of the data server cabinet 100, an equipment placement area 160 is available for storing multiple servers 162. The servers 162 can be mounted in the data server cabinet by means of vertical rails on which the servers can be mounted in a horizontal way. 2 5 Optionally, horizontal rails are additionally mounted for slidable insertion of the servers 162. Preferably, if possible, the servers 162 are placed with their front panel forming a substantially contiguous front plane. In case this is not possible, for whatever reason, gaps 164 between the servers 162 can be filled with cover plates (not shown) having substantially the same dimensions as the gaps 164.
30
The equipment placement area 160 and the mesh 150 preferably have substantially the same dimensions. In this particular case, this means that the mesh 150 covers between 66% and 75% of the front area of the door 120. In other cases, up to 80% of even 90% of the front area of the door 120 may be covered. Cases where 100% of the front area 5 of the door 120 is covered can be envisaged as well. However, in cases where part of the door 120 covers the frame of the housing 110 as well, the mesh 150 will at the periphery of the mesh 150 at the edges of the door 120 not have much effect on passing through an airflow. The mesh may optionally be divided in multiple meshes 5 like a first sub-mesh 152 and a second sub-mesh 154 as depicted by Figure 1 C.
In operation, the servers 162 are used for hosting data and/or computer applications. The servers 162 are in this embodiment located in a data warehouse where the servers 162 are employed for hosting applications accessible through a network service. Such 10 applications may be web shops or social network sites or other. While operating, the servers 162 and in particular components thereof dissipate a considerable amount of energy.
To ensure continuous proper functioning of the servers 162, the dissipated heat needs 15 to be removed. Preferably, this is done by cooling to air. In this embodiment, cool air flows in through the mesh 150 in the door 120. The cool air subsequently flows though the servers 162 and takes up thermal energy from the servers. In particular, the air takes up thermal energy from the microprocessor and memory circuits housed by the servers 162. The air that is thus heated flows out of the data server cabinet 100 via the 2 0 back of the data server cabinet 100. In this embodiment, this air flow may be aided by internal fans of the servers 162. Additionally or alternatively, the air flow is aided by external fans and/or natural convection of air resulting from gradual differences in temperature of air in a room. This is discussed in further detail in patent application PCT/EP2011/051327.
25 A person skilled in the art will appreciate that preferably, the data server cabinet 100 is not provided with the door 120 with the mesh 150 (or another mesh) at all to ensure an undisturbed flow of air towards and subsequently through the servers 162. However, in case the data server cabinet 100 is housing in a so-called "data hotel" where multiple 30 parties have access to one and the same corridor comprising multiple data server cabinets comprising servers of multiple parties, individual data server cabinets 100 need to be able to be locked to prevent unauthorised access to the servers 162. In such case, the data server cabinets 100 are preferably fitted with the door 120. To still enable an air 6 flow flowing through the servers 162 for cooling the servers 162, the door 120 is perforated.
Figure 2 shows the mesh 150 in further detail. The mesh 150 comprises rhombus 5 shaped perforations 200. The perforations 200 are separated by a grating 210 that is provided between the perforations 200. The perforations 200 have a first diagonal 202 and a second diagonal 204. The second diagonal 204 of which the length is indicated by "y" is preferably twice as long as the first diagonal 202 of which the length is indicated by "x". The perforations 200 are provided such that the second diagonal 204 is 10 located in the door 120 in a substantial horizontal way. With a rhombus being a orthodiagonal quadrilateral, this means that the first diagonal 202 is located in the door 120 in a substantial vertical way.
The first diagonal 202 preferably has a size between 7 and 12 millimetres and the 15 second diagonal 204 preferably has a size between 15 and 25 millimetres. Particularly preferred dimensions are a first diagonal of 11 millimetres and a second diagonal of 19 millimetres. The ratio between the first diagonal 202 and the second diagonal 204 is preferably between 35% and 65%. A ratio of substantially a half is particularly preferred. The distance between the edges of adjacent perforations, indicated by "v" is preferably 2 0 between 2 and 4 millimetres, more preferably between 2.5 and 3.5 millimetres, where 2 millimetres is particularly preferred.
In another embodiment, in particular where the perforations 200 are relatively large, for example with the first diagonal 202 having a length of over 30 millimetres, a ratio 2 5 between the first diagonal 202, the second diagonal or a perforation edge 206 of the perforation 200 is particularly relevant to preserve rigidity of the mesh 150 in the door 120. The length of the perforation edge 206 is indicated by "w". In particular in such case, but also in other embodiments, the ratio between the length of the perforation edge 206 and the distance between adjacent edges indicated by "v" is between three to 30 one to six to one. A larger ratio is preferred with a large dimension of the perforation 200 in order to ensure that enough air can flow through the mesh 150 for sufficiently cooling the servers 162.
7
The perforations 200 have been provided in a rhombus-like shape and in particular with the ratio between the first diagonal 202 and the second diagonal 204 indicated before to create a laminar flow of cool air after the air flow has passed the mesh 150 and before it enters the servers 162. In this way, the servers 162 can be cooled in a 5 more efficient way than in a situation where the flow of air that has passed the mesh 150 would be non-laminar or turbulent. This is discussed in further details in conjunction with Figure 3, Figure 4 and Figure 5. A person skilled in the art will appreciated that the rhombus shaped perforations 200 in the mesh are not necessarily mathematically perfect rhombi. Most important is that the shape of a rhombus is approached such that 10 the effects aimed to be achieved by the invention as discussed below are achieved. For example, the corners may be rounded off.
Figure 3 A shows a front view of the rhombus shaped perforation 200 as part of the mesh 150. Air flowing towards the mesh 150 and the rhombus shaped perforation 200 15 is indicated by the arrow marked with "a". Though the arrow "a" is drawn diagonally, the air may also enter the data server cabinet 100 in a substantially perpendicular direction or any other direction. With the rhombus shape of the perforation 200, simulations have shown that the air flow that has passed the mesh 150 is substantially laminar. Furthermore, the air flow that has passed the mesh 150 is evenly distributed also at 2 0 regions behind the grating 210 is provided.
Figure 3 B shows a cross-section of the mesh 150 with the rhombus shape perforations 200 over the line A-A' as indicated in Figure 3 A. In Figure 3 B, a first region I, a second region II and a third region III are indicated. The first region I is located at the outside of 25 the data server cabinet 100. For clarity purposes, the air flow outside the data server cabinet 100 is indicated as a laminar flow, though the flow could be otherwise shaped as well. In the second region II, directly behind the mesh 150, the airflow is only present behind the perforations 200 and not behind the grating 210. Flowever, towards the third region III, the airflow is redistributed to an evenly distributed laminar airflow. In the third 30 region III, the airflows in an evenly distributed way. The length of the second region II depends on the dimensions of the perforations 200 and the grating 210.
Figure 3 C shows a cross-section of the mesh 150 with the rhombus shape perforations 200 over the line B-B' as indicated in Figure 3 A. Also in Figure 3 C, a first region I, a 8 second region II and a third region III are indicated. Simulations have shown that with the cross-section over the line B-B', an evenly distributed laminar air flow is provided in the third region III. The air flow thus redistributed in vertical and horizontal directions is indicated in Figure 3 A as a first group of arrows bll for redistribution in 5 upper direction, a second group of arrows bD for redistribution in a downward direction, a third group of arrows bL for redistribution in left direction and a fourth group of arrows bR for redistribution in right direction.
The configuration depicted by Figure 1 B, with the servers 162 having a larger width 10 than height, is the most common configuration in data server cabinets for data warehousing. With such configuration of the servers 162, redistribution of an airflow by the mesh 150 has shown to be most efficient for cooling the servers 162 with rhombus shaped perforations 200 having a horizontal diagonal that is larger than a vertical diagonal.
15
Figure 4 A shows a detailed front view of a rectangular and non-square perforation 400 in another mesh 150. Around the perforation 400, a grating 410 is provided for separating individual perforations. Figure 4 B and Figure 4 C show an air flow entering and passing the mesh 150 based on substantially similar results from simulations. Like 2 0 with the rhombus shaped perforations 200 (Figure 2), the air is evenly redistributed over the cross-section A-A' as shown by Figure 4 B. However, the air flow is not evenly redistributed over the cross-section B-B' as shown by Figure 4 C. From Figure 4 C, it can be seen that behind the grating 410, is not distributed in an even way.
2 5 Figure 5 shows a circular perforation 500 comprised by a further mesh 150, surrounded by a further grating 510. Simulations show that air that has passed the mesh 150 with circular perforations 500 as depicted by Figure 5 has a turbulent characteristic. In particular, small vortices appear right behind the circular perforations 500, as indicated by triangle "b" in Figure 5. Due to the turbulent nature of this air flow, the air will in such 30 state not smoothly pass into the servers 162 to be cooled. Therefore, servers 162 cannot be cooled as efficient as with rhombus shaped perforations as discussed before.
Figure 6 A and Figure 6 B show other shapes of perforations that may be provided in other embodiments of the panel according to the invention. Figure 6 A shows a mesh 9 150 with square shaped perforations 600 separated by a grating 610. The dimensions of the square shaped perforations 600 as well as those of the grating 610 are preferably substantially the same as of the rhombus shaped perforations 200 as discussed in conjunction with Figure 2.
5
Figure 6 B shows a mesh 150 with perforations 650 separated by a grating 660. The perforations shown in Figure 6 B are shaped as a non-rhombus shaped parallelogram. The dimensions of the perforations 650 as shown by Figure 6 B as well as those of the grating 660 are preferably substantially the same as of the rhombus shaped 10 perforations 200 as discussed in conjunction with Figure 2.
Though the air flow efficiencies for cooling using the embodiments as shown by Figure 6 A and figure 6 B have not shown to be as good as using the embodiment as shown by Figure 2, efficiencies that are better than that of panels with meshes that are already 15 publically known.
So far, the mesh 150 has been discussed as being provided in the door 120 of the data server cabinet 100. The mesh 150 may also be provided as a fixed panel at the front side of the data server cabinet 100 and/or at the back side of the data server cabinet 2 0 100 in a fixed or movable manner. In case an air flow for cooling components of the data servers 162 is provided at the side, top or bottom of the data server cabinet 100, also or alternatively, those sides may be provided with a panel with the mesh 150.
Expressions such as "comprise", "include", "incorporate", "contain", "is" and "have" are 2 5 to be construed in a non-exclusive manner when interpreting the description and its associated claims, namely construed to allow for other items or components which are not explicitly defined also to be present. Reference to the singular is also to be construed in be a reference to the plural and vice versa.
3 0 In the description above, it will be understood that when an element such as layer, region or substrate is referred to as being "on", "onto" or "connected to" another element, the element is either directly on or connected to the other element, or intervening elements may also be present.
10
Furthermore, the invention may also be embodied with less components than provided in the embodiments described here, wherein one component carries out multiple functions. Just as well may the invention be embodied using more elements than depicted in Figure 1, wherein functions carried out by one component in the 5 embodiment provided are distributed over multiple components.
A person skilled in the art will readily appreciate that various parameters disclosed in the description may be modified and that various embodiments disclosed and/or claimed may be combined without departing from the scope of the invention.
10
It is stipulated that the reference signs in the claims do not limit the scope of the claims, but are merely inserted to enhance the legibility of the claims.

Claims (12)

1. Paneel voor een voor en/of achterzijde voor een kast voor het houden van elektrische apparatuur, het paneel omvattende ten minste een gaaswerk gevormd door 5 perforaties hoofdzakelijk in de vorm van een parallellogram in het paneel, welke gaaswerk ten minste 50% van het paneel bedekt en welke perforaties in de vorm van een parallellogram een eerste diagonaal en een tweede diagonaal hebben.A front and / or back panel for a cabinet for holding electrical equipment, the panel comprising at least one mesh formed by perforations mainly in the form of a parallelogram in the panel, which mesh at least 50% of the panel and which perforations in the form of a parallelogram have a first diagonal and a second diagonal. 2. Paneel volgens conclusie 1, waarbij de perforaties in de vorm van een 10 parallellogram gelijkzijdige vierhoeken zijn.2. Panel according to claim 1, wherein the perforations are in the form of a parallelogram equilateral quadrangles. 3. Paneel volgens conclusie 2, waarbij de eerste diagonaal korter is dan de tweede diagonaal.The panel of claim 2, wherein the first diagonal is shorter than the second diagonal. 4. Paneel volgens conclusie 3, waarbij de tweede diagonaal in hoofdzaak horizontaal is georiënteerd.The panel of claim 3, wherein the second diagonal is oriented substantially horizontally. 5. Paneel volgens conclusie 3, waarbij de verhouding tussen de eerste en de tweede diagonaal tussen 0,4 en 0,6 ligt. 20The panel of claim 3, wherein the ratio between the first and the second diagonal is between 0.4 and 0.6. 20 6. Paneel volgens conclusie 2, waarbij de gelijkzijdige vierhoeken een in hoofdzaak vierkante vorm hebben.The panel of claim 2, wherein the equilateral quadrangles have a substantially square shape. 7. Paneel volgens conclusie 1, waarbij de lengte van de eerste diagonaal 2 5 tussen 7 millimeter en 12 millimeter is.7. Panel as claimed in claim 1, wherein the length of the first diagonal 2 is between 7 millimeters and 12 millimeters. 8. Paneel volgens conclusie 1, waarbij de lengte van de tweede diagonaal tussen 15 en 25 millimeter is.The panel of claim 1, wherein the length of the second diagonal is between 15 and 25 millimeters. 9. Paneel volgens conclusie 1, waarbij de minimale afstand tussen twee aangrenzende zijden van aangrenzende perforaties tussen 2.5 en 3.5 millimeter ligt.The panel of claim 1, wherein the minimum distance between two adjacent sides of adjacent perforations is between 2.5 and 3.5 millimeters. 10. Paneel volgens conclusie 1, waarbij de verhouding tussen de eerste diagonaal en de minimale afstand tussen twee aangrenzende perforaties tussen drie en zes ligt.The panel of claim 1, wherein the ratio between the first diagonal and the minimum distance between two adjacent perforations is between three and six. 11. Kast voor het houden van elektrische apparatuur omvattende het paneel volgens een der voorgaande conclusies.A cabinet for holding electrical equipment comprising the panel according to any one of the preceding claims. 12. kast volgens conclusie 11, waarbij het paneel aan de kast is verbonden via ten minste een scharnier en waarbij het paneel is omvat in een deur.The cabinet of claim 11, wherein the panel is connected to the cabinet via at least one hinge and wherein the panel is included in a door.
NL2007223A 2011-08-04 2011-08-04 Panel for providing a front and/or backside for a cabinet for holding electrical equipment. NL2007223C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2007223A NL2007223C2 (en) 2011-08-04 2011-08-04 Panel for providing a front and/or backside for a cabinet for holding electrical equipment.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2007223A NL2007223C2 (en) 2011-08-04 2011-08-04 Panel for providing a front and/or backside for a cabinet for holding electrical equipment.
NL2007223 2011-08-04

Publications (1)

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NL2007223C2 true NL2007223C2 (en) 2013-02-05

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01102999A (en) * 1987-10-16 1989-04-20 Hitachi Medical Corp Electromagnetic wave shield room for nuclear magnetic resonance imaging equipment
JPH0471298A (en) * 1990-07-12 1992-03-05 Yokohama Rubber Co Ltd:The Structure of air vent panel
US20040233654A1 (en) * 2003-05-23 2004-11-25 Lin Yun Hsu EMI-attenuating air ventilation panel
US20050135075A1 (en) * 2003-12-23 2005-06-23 E. Com Compucase Co., Ltd. Computer case and parts thereof
US20070183129A1 (en) * 2005-10-10 2007-08-09 Chatsworth Products, Inc. Ratio of open area to closed area in panels for electronic equipment enclosures
US20090308033A1 (en) * 2008-06-12 2009-12-17 International Business Machines Corporation Modified hexagonal perforated pattern

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01102999A (en) * 1987-10-16 1989-04-20 Hitachi Medical Corp Electromagnetic wave shield room for nuclear magnetic resonance imaging equipment
JPH0471298A (en) * 1990-07-12 1992-03-05 Yokohama Rubber Co Ltd:The Structure of air vent panel
US20040233654A1 (en) * 2003-05-23 2004-11-25 Lin Yun Hsu EMI-attenuating air ventilation panel
US20050135075A1 (en) * 2003-12-23 2005-06-23 E. Com Compucase Co., Ltd. Computer case and parts thereof
US20070183129A1 (en) * 2005-10-10 2007-08-09 Chatsworth Products, Inc. Ratio of open area to closed area in panels for electronic equipment enclosures
US20090308033A1 (en) * 2008-06-12 2009-12-17 International Business Machines Corporation Modified hexagonal perforated pattern

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HC Change of name(s) of proprietor(s)

Owner name: EVOSWITCH IP B.V.; NL

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Effective date: 20160902

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Free format text: DETAILS ASSIGNMENT: VERANDERING VAN EIGENAAR(S), SAMENVOEGEN; FORMER OWNER NAME: KGG DATAXENTER HOLDING B.V.

Effective date: 20160902