US20080163559A1 - Electromagnetically reinforced structural assembly and associated method - Google Patents
Electromagnetically reinforced structural assembly and associated method Download PDFInfo
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- US20080163559A1 US20080163559A1 US11/620,407 US62040707A US2008163559A1 US 20080163559 A1 US20080163559 A1 US 20080163559A1 US 62040707 A US62040707 A US 62040707A US 2008163559 A1 US2008163559 A1 US 2008163559A1
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- electromagnet
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0237—Structural braces with damping devices
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/028—Earthquake withstanding shelters
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- Business, Economics & Management (AREA)
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- Environmental & Geological Engineering (AREA)
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
An electromagnetically reinforced structural assembly includes structural members, rigid mechanical connections joining an adjacent pair of the structural members, and at least one electromagnet disposed in the structural assembly. Each electromagnet is configured to be selectively energized to provide an electromagnetic attractive force between a respective pair of structural members to urge adjoining pairs of structural members to maintain their respective connections. An associated method of reinforcing a structural assembly includes providing a structural assembly with rigid mechanical connections and selectively actuating at least one electromagnet in the structural assembly to provide an electromagnetic attractive force that reinforces the connections.
Description
- The present invention relates to an electromagnetically reinforced structural assembly with electromagnetic enhancement of rigid mechanical connections and an associated method of using electromagnets to selectively reinforce rigid mechanical connections in structural assemblies.
- Weather, heat, time, and other natural and man-made phenomena have been known to apply large forces on structural assemblies. For example, a skyscraper may be required to withstand large shear forces due to high winds or an earthquake. Similarly, a bridge may be subject to tensile and bending forces as a result of the weight of vehicles on the bridge, as well as torsion forces due to extreme weather.
- A structural assembly is also often required to endure the destructive effects of corrosion and void growth in its structural members. This progressive deterioration in the structural integrity of the assembly may be augmented by improper or inadequate maintenance or even man-made disasters, such as the explosion of a bomb or other detonating device.
- In general, the resistance of a structural assembly to such forces is highly dependent on the strength of the connections joining adjacent structural members of the building. Such structural members may include walls, beams, columns, and floor-slabs. For example, the strength of a building may be defined by the strength of the joints between the I-beams of the building's frame, and any failure of rivets or other fasteners in the I-beam joints may weaken the structure and reduce the capability of the building to resist an increase in the forces borne by the joint, such as during an earthquake.
- The reinforcement of the rigid mechanical connections in a structural assembly may require the use of stronger materials, a larger quantity of fasteners, or a greater number of joints to bear the load. Permanently increasing the load bearing capacity of such joints, however, may increase the cost of construction, the weight of the structural assembly (which may in turn increase the forces to be borne), and the complexity of the construction project. In addition, implementing these measures may reduce the availability of certain architectural designs, thereby limiting the creativity of the design and the aesthetic value of the structural assembly. Furthermore, the transient and unpredictable nature of a load-creating event, such as an earthquake or a hurricane, makes permanent fortification of the joints even more inefficient and problematic.
- As a result, there is a need for a structural assembly in which the structural integrity of the mechanical connections is selectively enhanced to withstand increases in the forces borne by those joints, such as forces resulting from extreme weather and natural and man-made disasters, as well as an associated method for selectively enhancing the structural integrity of structural assemblies.
- The present invention generally relates to an electromagnetically reinforced structural assembly with rigid mechanical connections that may be selectively reinforced in response to increased or abnormal forces, as well as an associated method for selectively enhancing rigid mechanical connections. Electromagnets in the structural assembly create electromagnetic fields to urge adjoining pairs of structural members to maintain their respective connections.
- According to one embodiment of the present invention, the electromagnetically reinforced structural assembly comprises a plurality of structural members and a plurality of rigid mechanical connections, each connection rigidly joining an adjacent pair of the structural members. At least one electromagnet is disposed in the structural assembly, and each electromagnet is configured to be selectively energized to provide an electromagnetic attractive force between a respective pair of the structural members at the mechanical connection, thereby reinforcing the connection.
- According to some embodiments, the electromagnetically reinforced structural assembly may further comprise a power source, at least one sensor, and a controller. The electromagnets may be adjustable between a non-energized state and an energized state, and the power source may be configured to provide electrical power for energizing the electromagnet. The sensor may be configured to sense a condition of the structural assembly, and the controller may be configured to control the power provided by the power source to the electromagnet according to the condition sensed by the sensor in order to selectively reinforce the structural assembly. Thus, each electromagnet may be configured in the non-energized state when the condition is not sensed and in the energized state when the condition is sensed.
- In one embodiment, each electromagnet may be integral to at least one of the structural members such that the electromagnet is configured to generate an electromagnetic field in the structural member. Each electromagnet may include a conductive element defining a plurality of turns around one of the structural members. The conductive element may be configured to receive an electric current and thereby generate the electromagnetic field in the structural member. In another embodiment, each electromagnet may be attached to at least one of the structural members.
- In some embodiments, the controller is configured to actuate the electromagnet according to a condition sensed by the sensor. The sensor may be configured to sense a stress, a strain, or a density in at least one of the structural members, or the sensor may be configured to sense external weather phenomena, such as wind speed or earthquake vibrations. The controller of some embodiments may also be configured to receive a manual input to energize the power source and actuate the electromagnet.
- The structural assembly may have rigid mechanical connections comprising weld joints that connect each respective pair of structural members. In other embodiments of the invention, the rigid mechanical connections may comprise rivets or bolts that extend through each respective pair of structural members.
- An associated method of reinforcing a structural assembly is also provided. The method comprises the steps of providing a structural assembly having a plurality of structural members joined by rigid mechanical connections and selectively actuating at least one electromagnet. By selectively actuating an electromagnet, an electromagnetic attractive force is provided between respective pairs of the structural members at the mechanical connection to urge the structural members together and reinforce the connection.
- In one embodiment, the method further comprises wrapping a conductive element a plurality of times around one of the structural members. An electric current may then be passed through the conductive element to generate an electromagnetic field in the structural member. In another embodiment, at least one electromagnet may be attached to one of the structural members to reinforce the corresponding rigid mechanical connection.
- In some embodiments of the present invention, the method of reinforcing the structural assembly may include manually energizing the electromagnet from a remote location. The method may also include the step of remotely identifying the location of each actuated electromagnet.
- In one embodiment, the method may include sensing a predetermined condition and may further comprise remotely identifying the predetermined condition sensed. Reinforcing the structural assembly may include the step of initiating a response according to the actuated state of the electromagnet or according to the predetermined condition sensed. If a response is initiated, the response may be to perform repairs on the structural assembly. Likewise, the response may be to activate an alarm based on the predetermined condition sensed.
- In some embodiments of the present invention, the method may further comprise indefinitely maintaining at least one electromagnet in an actuated state. The method may also include selectively returning each electromagnet to a non-actuated state after the predetermined condition has terminated.
- Thus, the present invention provides a structural assembly and method that selectively enhance the integrity of the mechanical connections of the assembly using electromagnets, e.g., by selectively actuating electromagnets in a structural assembly to reinforce the rigid mechanical connections of the structural assembly.
- Having thus described the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
-
FIG. 1 is a side plan view illustrating a structural assembly including I-beam structural members, with electromagnets that are integral to a structural member of the assembly, according to one embodiment of the present invention; -
FIG. 2 is a perspective view illustrating a portion of the frame for the hull of a nautical vessel, according to another embodiment of the present invention; -
FIG. 3 is a schematic diagram illustrating a portion of the hull of a nautical vessel, with electromagnets that are attached to two of the structural members of the structural assembly, according to the embodiment ofFIG. 2 ; and -
FIG. 4 is a plan view illustrating a rigid mechanical connection of a structural assembly, including an electromagnet that is attached to a structural member and a power source, controller, and sensor in communication with each other. - The present inventions now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the inventions are shown. Indeed, these inventions may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout.
- The present invention generally relates to a
structural assembly 10 with rigidmechanical connections 20 that may be selectively reinforced in response to increased or transient forces, as well as an associated method for selectively enhancing rigidmechanical connections 20. As described further below, the structural assembly generally includes electromagnets that create magnetic fields to urge adjoining pairs of structural members together to maintain their respective joints. - Referring to
FIG. 1 , thestructural assembly 10 may be a frame for a structure, such as a building or a bridge. Thestructural assembly 10 includes a plurality ofstructural members mechanical connections 20 between adjoining members. Thestructural members FIG. 1 , thefirst member 12 is an I-beam arranged horizontally as a beam, and thesecond members 14 are I-beams arranged vertically as columns.Other members 15 are also provided in theassembly 10, e.g., extending between theconnections 20.Mechanical connections 20 are formed by extendingfasteners 22, such as rivets or bolts, through each respective pair of I-beamstructural members fastener 22 extends through one of thefirst members 12 and an adjacent one of thesecond members 14, e.g., through the flanges of theadjacent members structural members connections 20. - The
structural assembly 10 may also be the frame of other structures, such as a motor vehicle or a nautical vessel. For example,FIG. 2 illustrates an embodiment in which the assembly forms the internal frame of the hull of a ship. The frame of the hull includes firststructural members 12 that extend generally longitudinally to define one side of the frame and secondstructural members 14 that extend generally longitudinally to define the other side of the frame. The frame of the hull also includes otherstructural members 16 that extend generally transversely with respect to the first and secondstructural members structural members mechanical connections 20. That is, the secondstructural members 14 intersect the firststructural members 12, such that each member is positioned adjacent and connected to at least one of theother members members transverse members 16, forming additionalmechanical joints 20. - In other embodiments, the
structural assembly 10 can have other configurations and can be used for the construction of other buildings, vehicles, and the like. - In each of the
structural assemblies 10, themechanical connections 20 can be reinforced byelectromagnets 30. For example, theelectromagnets 30 may be disposed at critical load-bearing joints in the frame of a structure to reinforce thosemechanical connections 20 during periods in which thestructural assembly 10 is subject to increased forces. Eachelectromagnet 10 is configured to provide an attractive force that tends to urge two adjacentstructural members - In some embodiments of the present invention, the
electromagnets 30 can be integral to the associatedstructural members FIG. 1 , aconductive element 34 is wrapped a number of times around one of the firststructural members 12. Anelectromagnetic field 32 is created when electricity is passed through theconductive element 34. Theelectromagnetic field 32 surrounds the portion of the firststructural member 12 that is wrapped with theconductive element 34 and acts as an attractive force with respect to the adjoining secondstructural member 14, i.e., thestructural member 14 that is rigidly connected to the first structural member by theconnection 20. As a result of the attractive force provided by the electromagnetic field, the adjoiningstructural members mechanical connection 20 between them. - In others embodiments of the present invention, the
electromagnets 30 can be distinct from thestructural members FIG. 3 , theelectromagnets 30 are provided as separate members that are connected to thestructural members connections 20. Electrical power is supplied through apower line 45 to energize theelectromagnet 30 and create anelectromagnetic field 32 around the energizedelectromagnet 30. Theelectromagnetic field 32 acts as an attractive force with respect to the adjoining secondstructural member 14, thereby urging the adjoiningstructural members mechanical connection 20 between them. In some cases, an electromagnet can be provided at a connection of three or more structural members, such that the electromagnet is configured to provide an attractive force between the three or more structural members and reinforce the connection of the multiple members. - The
structural assembly 10 of the present invention typically includes apower source 40 that is configured to provide electrical energy to theelectromagnets 30 to actuate theelectromagnets 30 and generate the electromagnetic fields. Thepower source 40 can be selectively actuated so that theelectromagnets 30 are powered only at select times, e.g., when the structural assembly is experiencing a higher-than-normal load or stress, or at times when a higher-than-normal load or stress is likely or expected, such as during an earthquake. - The
assembly 10 can also include devices for automatically actuating theelectromagnets 30. For example, as shown inFIG. 4 , thepower source 40 is in electrical communication with one ormore sensors 60 and acontroller 50. Thesensors 60 are configured to monitor thestructural assembly 10 and measure or detect a particular condition of theassembly 10, such as a stress, strain, or displacement in theassembly 10. For example, eachsensor 60 can include a strain sensor that uses one or more Wheatstone bridges to detect small changes in the stress, strain, or displacement of a portion of theassembly 10. Theassembly 10 typically includes a plurality ofsensors 60, such that eachsensor 60 can detect a condition in a different portion of theassembly 10. Thesensors 60 transmit asignal 55 indicative of the monitored condition to thecontroller 50, which may be located proximate to the assembly or remotely from thepower source 40 and/or the enhanced rigidmechanical connections 20. - The
controller 50 can receive thesignal 55 from thesensor 60, analyze thesignal 55, and determine the appropriate response. For example, if thesignal 55 from one ormore sensors 60 indicates that theassembly 10 is experiencing a stress, strain, or displacement that is higher than a predetermined threshold value (or a change in stress, strain, or displacement that is greater than a predetermined threshold value), thecontroller 50 can respond by actuating thepower source 40 to provide electrical power via apower line 45 to one or more of theelectromagnets 30 to generate anelectromagnetic field 32 and provide a reinforcement to theassembly 10. In particular, thecontroller 50 can transmit asignal 57 to thepower source 40 in response to the condition sensed and reported by thesensor 60. Thesignal 57 from thecontroller 50 to thepower source 40 can cause thepower source 40 to supply electrical power to theelectromagnet 30 through thepower line 45, thus actuating all of theelectromagnets 30 or only thoseelectromagnets 30 that are capable of reinforcing the portion of theassembly 10 that is undergoing the condition. Thesignals assembly 10 are typically transmitted electronically, e.g., via a wired or wireless connection. - Each
sensor 60 can be strategically located within thestructural assembly 10 or external to thestructural assembly 10, depending on the nature of the condition to be detected and the best location at which to detect the particular conditions of interest. For example, eachsensor 60 can be affixed to astructural member FIG. 4 , and configured to measure the stress or strain induced in thestructural member sensor 60 can be located at a rigidmechanical connection 20 or on afastener 22 and configured to measure the density of astructural member fastener 22, or other component of thestructural assembly 10. - In some cases, one or more of the
sensors 60 are located external to thestructural assembly 10 and configured to measure certain weather and environmental variables. For example, thesensors 60 may be located at the top of astructural assembly 10, such as a skyscraper or other building, in order to sense wind speed. Likewise, thesensor 60 may be located outside thestructural assembly 10 or on the external surface of thestructural assembly 10 at or near ground level in order to measure the intensity of vibrations caused by an earthquake or a large explosion. - In some embodiments, the
electromagnets 30 are configured to remain in the non-energized state when no conditions are being detected by thesensor 60 or when the conditions detected do not meet a threshold level, as determined by thecontroller 50. For example, eachelectromagnet 30 can be configured to remain in the non-energized state until the controller issues a command or other signal to theelectromagnet 30. Alternatively, thecontroller 50 can provide a continuous signal that maintains theelectromagnet 30 in a non-energized state, the signal being interrupted or replaced with another signal only when actuation ofelectromagnet 30 is desired. In any case, when thecontroller 50 determines that the condition sensed by thesensor 60 meets a threshold level and warrants a response, thecontroller 50 can be configured to actuateelectromagnet 30, e.g., by transmitting thesignal 57 to thepower source 40 to instruct thepower source 40 to supply electrical power to theelectromagnet 30. - When determining whether a response is necessary, the
controller 50 may be configured to compare the level of stress or strain, the speed of the wind, the intensity of vibration, or other condition detected by thesensor 60, to a predetermined value for the corresponding condition. Similarly, thecontroller 50 may be configured to calculate a difference between a “normal” condition, such as material density, and the condition sensed by thesensor 60. - The
controller 50 may be configured to determine which, if any, of the rigidmechanical connections 20 may be at risk as a result of the condition sensed by thesensor 60, as well as the extent of the risk. In response, thecontroller 50 may determine which of theelectromagnets 30 in thestructural assembly 10 should be actuated and transmit asignal 57 to actuate only thoseelectromagnets 30 selected. In some embodiments of the present invention, thecontroller 50 may be configured to receive a manual input to actuate theelectromagnets 30. For example, a remote third party, such as a maintenance technician or a security guard, may provide a manual input to thecontroller 50 to actuate one ormore electromagnets 30 in the event that the third party determines that fortification of the rigidmechanical connections 20 is immediately required. - According to one method of the present invention, the integrity of a
structural assembly 10 is enhanced by providing astructural assembly 10 configured as previously described, sensing a predetermined condition, and selectively actuating one ormore electromagnets 30 in thestructural assembly 10. As discussed above, theelectromagnets 30 may be integral to or distinct from thestructural members structural assembly 10. In this regard,FIG. 1 illustrates anelectromagnet 30 in which a firststructural member 12 is part of the electromagnet such that the electromagnet is integral to the firststructural member 12. For example, aconductive element 34 can be wrapped or coiled a plurality of times around one of thestructural members conductive element 34 to generate anelectromagnetic field 32 in thestructural member - Alternatively,
FIGS. 3 and 4 illustrate anelectromagnet 30 that is distinct from thestructural members electromagnets 30 and thestructural members electromagnets 30 are then attached to thestructural members mechanical connections 20 that are to be reinforced. In this way, an existingstructural assembly 10 may be reinforced by installing one ormore electromagnets 30 at certainmechanical connections 20. - In some cases, the
structural assembly 10 can be reinforced by automatically or manually energizing theelectromagnets 30 from a remote location. Further, the location of each actuated electromagnet can be remotely identified, and/or each electromagnet can be separately controlled so that reinforcement is provided only at select connections where the reinforcement is required or otherwise desirable. - The
electromagnets 30 can be controlled according to the conditions of the assembly, e.g., by sensing a predetermined condition, such as by using thesensors 60. Thus, according to one method of the present invention, the predetermined condition that is sensed is remotely identified, and a response is initiated. The response can be initiated according to the actuated state of theelectromagnet 30 and/or the predetermined condition that is sensed. Further, in some cases, the response can include performing repairs on thestructural assembly 10. In other cases, the response can be initiated by activating an alarm based on the predetermined condition sensed. - The one or
more electromagnets 30 in an assembly can be actuated selectively only at particular times, such as when additional reinforcement is required due to environmental conditions. That is, each actuatedelectromagnet 30 can be selectively returned to a non-actuated state once the predetermined condition is terminated. Alternatively, theelectromagnets 30 can be maintained in an actuated state indefinitely. - Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (23)
1. An electromagnetically reinforced structural assembly comprising:
a plurality of structural members;
a plurality of rigid mechanical connections, each connection rigidly joining an adjacent pair of the structural members; and
at least one electromagnet disposed in the structural assembly, each electromagnet configured to be selectively energized to provide an electromagnetic attractive force between a respective pair of the structural members at the mechanical connection thereof and thereby reinforce the connection.
2. A structural assembly according to claim 1 , further comprising:
a power source configured to provide electrical power for energizing the electromagnet;
at least one sensor configured to sense a condition of the structural assembly; and
a controller configured to control the power provided by the power source to the electromagnet according to the condition sensed by the sensor to selectively reinforce the mechanical connection of the structural assembly.
3. A structural assembly according to claim 2 wherein each electromagnet is adjustable between a non-energized state and an energized state, each electromagnet being configured in the non-energized state when the condition is not sensed and each electromagnet being configured in the energized state when the condition is sensed.
4. A structural assembly according to claim 1 wherein each electromagnet is integral to at least one of the structural members such that the electromagnet is configured to generate an electromagnetic field in the structural member.
5. A structural assembly according to claim 4 wherein each electromagnet includes a conductive element defining a plurality of turns around one of the structural members, the conductive element being configured to receive an electric current and thereby generate the electromagnetic field in the structural member.
6. A structural assembly according to claim 1 wherein each electromagnet is attached to at least one of the structural members.
7. A structural assembly according to claim 2 wherein the controller is configured to receive a manual input to energize the power source and actuate the electromagnet.
8. A structural assembly according to claim 2 wherein the sensor is configured to sense at least one of the group consisting of a stress, a strain, and a density in at least one of the structural members.
9. A structural assembly according to claim 2 wherein the sensor is configured to sense external weather phenomena.
10. A structural assembly according to claim 1 wherein the rigid mechanical connections comprise weld joints connecting each respective pair of structural members.
11. A structural assembly according to claim 1 wherein the rigid mechanical connections comprise at least one of the group consisting of rivets and bolts extending through each respective pair of structural members.
12. A method of reinforcing a structural assembly, the method comprising:
providing a structural assembly having a plurality of structural members, adjacent pairs of the structural members rigidly joined by rigid mechanical connections; and
selectively actuating at least one electromagnet to provide an electromagnetic attractive force between respective pairs of the structural members at the mechanical connection thereof to urge the structural members together and reinforce the connections.
13. A method according to claim 12 further comprising wrapping a conductive element a plurality of times around one of the structural members.
14. A method according to claim 13 further comprising passing an electric current through the conductive element such that an electromagnetic field is generated in the structural member.
15. A method according to claim 12 wherein providing the structural assembly comprises attaching at least one electromagnet to one of the structural members.
16. A method according to claim 12 , further comprising manually energizing the electromagnet from a remote location.
17. A method according to claim 12 , further comprising remotely identifying a location of each actuated electromagnet.
18. A method according to claim 12 , further comprising monitoring and sensing a predetermined condition and performing said actuating step upon sensing the predetermined condition.
19. A method according to claim 18 , further comprising remotely identifying the predetermined condition sensed.
20. A method according to claim 18 , further comprising initiating a response according to at least one of the actuated state of the electromagnet and the predetermined condition sensed.
21. A method according to claim 20 wherein the response is performing repairs on the structural assembly.
22. A method according to claim 20 wherein said initiating step comprises activating an alarm based on the predetermined condition sensed.
23. A method according to claim 12 , further comprising selectively returning each electromagnet to a non-actuated state after a termination of a predetermined condition.
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US11/620,407 US20080163559A1 (en) | 2007-01-05 | 2007-01-05 | Electromagnetically reinforced structural assembly and associated method |
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US11/620,407 US20080163559A1 (en) | 2007-01-05 | 2007-01-05 | Electromagnetically reinforced structural assembly and associated method |
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