Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F7/00—Vibration-dampers; Shock-absorbers
  • F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
  • F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
  • F16F7/108—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on plastics springs
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
  • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
  • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
  • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
  • G11B33/08—Insulation or absorption of undesired vibrations or sounds

Definitions

• the present invention relates generally to mounting systems that protect against vibration, and in particular to pre-fabricated, integral isolating systems for light-weight devices mounted in vehicles.
• a device for example, a hard disk
• a vehicle for example, in a computer of the vehicle
• Isolating systems are mounting systems that give protection from vibrations and shocks, by supporting the device with elastomeric elements, i.e., elements made from rubber-type materials.
• the dynamic characteristics of elastomeric elements a combination of a spring with an effective spring stiffness, k, in each direction and a damper with an effective coefficient of viscous damping, c, in each direction, can provide this protection.
• the spring stores potential energy and its stiffness is analogous to the reciprocal of capacitance in an electrical circuit.
• the damper dissipates energy and its coefficient is analogous to the resistance in an electrical circuit.
• the dynamic characteristics are generally determined by the type, composition and geometry of the elastomeric element and by the molding process used to produce it.
• an isolating system may comprise several elastomeric elements. In known devices, these elements have similar dynamic characteristics. This condition is known as "dynamic matching". d. Depending on its application, the isolating system may have to withstand harsh environmental conditions, such as high temperatures, high humidity, high levels of dust, sand, or fungus.
• T is a transmissibility distribution
• T is a ratio between vibrations transmitted to the device (output) and external vibrations (input), which is often shown as a function of different ratios of forced to natural frequencies.
• T For a simplified calculation of the transmissibility distribution, T, one may consider a hard disk of a mass m, mounted on an isolating system of effective k and c values in a specific direction (a single degree of freedom.).
• the hard disk and the isolating system may be inserted in a computer of a vehicle, where the vehicle has a forced frequency ⁇ .
• T The transmissibility distribution, is a function of both ⁇ and r.
• T one dimensional model
• the transmissibility distribution peaks for each ⁇ value when a natural frequency coincides with a forced frequency, ⁇ /p « 1. An approximation of the peak value may be made as,
• transmissibility applies to a value read from the transmissibility curve at an appropriate frequency ratio, while the term peak transmissibility applies to T max at the natural frequency.
• isolating components each comprising an elastomeric element attached or bonded to metal.
• This type of components is provided by companies such as Lord Corp. of Erie, PA USA, or Barry Control Corp. of Burbank, CA USA.
• an isolating system is fabricated at a vehicle-fabrication site, made to order for a specific vehicle type, from the isolating components.
• One disadvantage of this approach is the difficulty in achieving dynamic matching. Components of identical materials, molded at different times, may have different dynamic characteristics. Consequently, a rejection rate of isolating components, due to differences in dynamic characteristics, is high.
• designing an isolating system for each type of vehicle, individually, and fabricating it at a vehicle-fabrication site is not cost effective. Nor does such a process typically benefit from optimum quality control conditions.
• Makeshift alterations have to be performed at the vehicle-fabrication site, by changing the stiffness of a structure of the isolating system (if possible) or by replacing the elastomeric elements altogether. Because makeshift alterations may be necessary, the advantages of cost effectiveness and high quality control conditions are somewhat lost.
• An aspect of some exemplary embodiments of the invention relates to providing a configurable pre-fabricated, integral isolating system for a device, for example a lightweight device such as a disk drive.
• the isolating system can be tailored for a range of vehicles, for example by attachable or detachable weights, optionally modular weights.
• the system is provided in kit form, for example packaged with operating instructions.
• modular weights are added or subtracted in order to achieve a specific natural frequency, and the transmissibility value changes accordingly.
• modular weights are added or subtracted in order to achieve a specific value of transmissibility, and the natural frequency changes accordingly.
• the isolating system is pre-fabricated by a standard manufacturing process, at an isolating system manufacturing site, resulting in one or more of: a. inherent dynamic matching as all the elastomers are molded at the same time; b. optimum quality-control conditions; and c. cost effective production process.
• the isolating system is intended for a data-storage device, such as a hard disk which may be installed in a computer or in any other electronic or electro-optic instrument.
• the isolating system is intended for an electronic device, such as a light-weight computer.
• the isolating system is intended for an optical device, such as a light-weight camera.
• the isolating system is intended for a crystal or a diode.
• the isolating system is intended for a component of an electronic instrument or an optical instrument, or an electro-optical instrument.
• Various sizes may be provided, for example, matching modular electronic component sizes, both with respect to internal and external dimensions.
• Standard connector locations e.g., holes for screws
• Different sizes, materials and/or weights of the isolation system may be provided for different applications.
• the pre-fabricated, integral isolating system provides isolation-protection in all directions, including three linear axes (x, y and z) and rotation around each of the three axes, however this is not always required and fewer axes may be isolated.
• the dynamic characteristics and/or isolation of the isolating system are substantially the same in the x, y and z. directions.
• protection is substantially the same also in each rotational direction.
• the pre-fabricated, integral isolating system has different dynamic characteristics in different directions and/or axes, and different levels of protection are achieved for each.
• the pre-fabricated, integral isolating system may be integrated into the vehicle structure in various attitudes, and be hung from a ceiling, or attached to a single wall, or placed on a floor. Alternatively, the isolating system may be supported at two or more points, comprising, for example, any of the above mounting configurations.
• a pre-fabricated, integral isolating system applies to a specific make and model of a device, and provides a tight fit for that make and model.
• an isolating system applies to specific dimensions and may be used for devices that are substantially of those dimensions.
• an isolating system may be used for any of several different devices that are relatively close in dimensions, for example, by providing a spring- leaf or another attachment system, such as screws, clips, hooks and/or pressure fittings, for holding the device tightly in place.
• the system is designed for one or more particular external packaging systems and/or sizes, for example a military PC. Alternatively, the system is designed in a range of sizes.
• the addition or subtraction of modular weights is conducted symmetrically around an x-axis, a y-axis and a z-axis. Alternatively, the addition or subtraction of modular weights is conducted symmetrically around an x-axis and a z-axis, but not around a y-axis.
• providing an isolating system tailored to a vehicle comprises providing a plurality of isolating systems tailored to a plurality of vehicles of the same make and model, such as a plurality of F-15 jets.
• providing an isolating system tailored to a vehicle comprises providing an isolating system to a single vehicle or to a few vehicles.
• tuning is conducted at the manufacturing site and comprises: a. receiving information about the vehicle's forced frequencies and the mass being isolated; b. calculating the expected values of the natural frequency, frequency ratio and transmissibility with high accuracy (for example, by using a finite-element method); and c. adding or subtracting modular weights to the isolated system.
• tuning is conducted at the vehicle-fabrication site and comprises: a. measuring the vehicle's forced frequencies; b. measuring the natural frequencies of the isolating system with the device installed; c. calculating the frequency ratio and transmissibility based on the measured values; and d. adding or subtracting modular weights to the isolating system.
• tuning may be based on a combination of calculated values and measured values.
• the isolating system comprises elastomers manufactured as a fully bonded sandwich (metal-rubber-metal, with rubber to metal bonding, optionally by a transfer molding process).
• this manufacturing process provides a tight control over the dynamic properties of the elastomers and close agreement between calculated and measured natural frequencies.
• the close agreement comprises a calculation error no greater than 1.5, 3 or 5 Hz in the natural frequency, or an error of smaller than 10%, 5% or 1%.
• other manufacturing processes may be used, and tuning the transmissibility is conducted at the vehicle-fabrication site, based on measured frequencies.
• a pre-fabricated kit for providing an integral isolating system for a device to be used in a vehicle comprising: an inner frame, adapted to have the device mounted thereon; an outer frame adapted to be mechanically coupled to the vehicle; a plurality of elastomeric elements, which interconnect the inner frame to the outer frame, isolating the inner frame from vibrations and shocks encountered by the outer frame; and at least one modular weight element adapted to be selectively attached to said inner frame, thereby altering the natural frequency and with it the transmissibility of the isolation system.
• said weight element is provided attached to said inner frame and is adapted to be removed.
• said weight element is provided separated from said inner frame and is adapted to be attached to said frame.
• said at least one weight element comprises at least two weights.
• said at least one weight element comprises at least five weights.
• said weight elements are all the same in size and weight.
• said weight elements have at least two different weights.
• said weight elements have at least two different shapes.
• said at least one weight element has a rectangular shape.
• said at least one weight element has a flat cylindrical shape.
• said inner frame includes at least one docking station for mounting said at least one weight element therein.
• said docking station comprise a plurality of sockets.
• said at least one docking station is arranged to allow a center of gravity of said system, in at least one axis, to be maintained when said at least one weight element is attached.
• said outer frame is adapted to attach to said vehicle.
• said outer frame is manufactured to match at least one a standardized packing size.
• said inner frame is manufactured to match at least one a standardized component size.
• said elastomeric elements are arranged in a plane. Alternatively, said elastomeric elements are placed on six sides of said inner frame.
• all of said elastomeric elements are the same. Alternatively, at least two of said elastomeric elements are different. In an exemplary embodiment of the invention, the elastomeric elements are dynamically matched. Alternatively or additionally, each elastomeric element is a fully bonded metal-rubber-metal sandwich by a transfer molding process. Alternatively or additionally, the elastomeric elements provide isolation in x, y and z axes and in three corresponding rotational axes. Alternatively or additionally, the elastomeric elements have substantially similar dynamic characteristics in the x, y, and z directions. Alternatively or additionally, the kit is adapted to be integrated into a vehicle in any attitude.
• said device is removable from said system.
• said system is sealed to be air-tight.
• said system is sealed to be water- tight.
• said vehicle is an airborne vehicle.
• said vehicle is a ground vehicle.
• said vehicle is a water borne vehicle.
• said device is isolated from large amplitude sinusoidal vibrations.
• said device is isolated from large amplitude shock vibrations.
• said device is isolated from large amplitude random vibrations.
• said device is isolated from motor vibrations.
• said at least one weight element is selected to have a combined weight greater than 50% of the weight of the inner frame and the device.
• said at least one weight element is selected to have a combined weight greater than 100% of the weight of the inner frame and the device. Alternatively or additionally, said at least one weight element is selected to have a combined weight greater than 400%o of the weight of the inner frame and the device. Alternatively or additionally, said at least one weight element is selected to have a combined weight greater than 800% of the weight of the inner frame and the device.
• the kit is integrated with a mechanical memory device or an electro-optronic device.
• a method of manufacturing a kit for an isolation system comprising: providing an inner frame, including at least one docking station for a weight; providing an outer frame; and transfer molding at least one elastomeric element between said inner and said outer frames.
• a method of tuning a modular isolation system comprising: selecting a modular isolation system kit for a vehicle and a device; determining a natural frequency or transmissibility for the isolation system and the device; determining a modular weight to be added or removed to said isolation system; and adding or removing said weight element, to achieve a desired isolation behavior.
• said weight element is attached to said system.
• said weight element is removed from said system.
• Figs. 2A and 2B schematically illustrate a pre-fabricated, integral isolating system comprising modular weights and sockets for them, in accordance with an exemplary embodiment of the invention
• Figs. 4 schematically illustrates a constant "center-of-gravity" condition that is maintained with the additions of weights, in accordance with an exemplary embodiment of the invention
• Fig. 5 illustrates a relationship of transmissibility T as a function of mass for different initial damping factors, ⁇ , assuming an initial mass of 500 gram, and resonance at 20 Hz; and Figs. 6A and 6B illustrate, in a flow-chart format, the method of providing a specific vehicle type with a pre-fabricated, integral isolating system that is tailored to it.
• FIGs. 2A and 2B schematically illustrate a top view and a bottom view, respectively of an exemplary pre-fabricated, integral isolating system 10, that includes a plurality of elastomeric elements 18, one or more modular weights 24 in one or more sockets 22, and containing a hard disk 12, in accordance with an exemplary embodiment of the invention.
• isolating system 10 and hard disk 12 constitute an overall assembly 21 having a known set of natural frequencies and a known first (lowest) natural frequency.
• disk 12 Other types of data storage device may be provided instead of disk 12, for example, a CD player and a diskette drive.
• a CD player and a diskette drive.
• other electronic, optical, electro-mechanical or electro-optical devices are provided, for example, a diskette drive.
• overall assembly 21 may be mounted on any one of a plurality of different types of vehicles (for example, a Boeing 747, not shown) wherein the vehicle may have a specific set of forced frequencies at a range close to the first natural frequency of overall assembly 21 and/or close to a sensitive frequency of disk 12 (or any other isolated device). Resonance and high transmissibility encountered when a natural frequency and a forced frequency commensurate, can be avoided, for example, by adding modular weights 24 to assembly 21 in a specific number and/or arrangement, determined for the specific type of vehicle, thus altering the natural frequencies of overall assembly 21 and the transmissibility of isolating system 12.
• Exemplary vehicles include, cars, motorcycles, humans (e.g., for hand carried devices), trains, airplanes (civilian, military, jet and propeller), helicopters, hovercraft, ships, boats, undersea vehicles, space ships and rockets.
• the "vehicle” does not move, for example, when the isolated device is mounted in a control room of a factory or a mine.
• isolating system 10 is pre-fabricated by a standard manufacturing process, at an isolating system manufacturing site, resulting in inherent dynamic matching as all of elastomeric elements 18 are molded at in one molding process, optimum quality-control conditions, and cost effective production process.
• mismatching maybe compensated for, for example, by adding and removing of weights and/or moving the center of gravity.
• each of elastomeric element 18 is a fully bonded, metal-rubber-metal sandwich, with rubber to metal bonding by a transfer molding process.
• the forced frequencies for the vehicle, for a specific location within the vehicle are determined at a vehicle-fabrication site (not shown), and a specific arrangement of modular weights 24 is selected for the type of vehicle and for the location within it.
• modular weights 24 are installed at the isolating system manufacturing site, under optimum quality-control conditions, to insure a tight control of the natural frequency of overall assembly 21.
• the tailored assembly 21 is then shipped to the vehicle-fabrication site.
• isolating system 10 comprises an outer frame 16 and an inner frame 14, both made, for example of metal and/or plastic.
• outer frame 16 is of proper dimensions to be inserted in a hard-disk slot (not shown) for example in a computer (not shown) provided in the vehicle.
• the geometry and/or connector locations of outer frame 16 may match other standardized receptacles known in the art.
• inner frame 14 is smaller (in all dimensions) than outer frame 16.
• inner frame 14 is of proper dimension to provide a tight fit with hard disk 12.
• frame 14 is made to match one or more standardized sizes for devices, such as hard disks.
• one or more spring-leaf arrangements, or other arrangements hold hard disk 12 tightly inside inner frame 14.
• one or more spring-leaf arrangements, and/or other arrangements, such as screws or adhesive maintain outer frame 16 fixed in its slot.
• elastomeric elements 18, distributed, for example, along the four sides of hard disk 12, in a gap 19 between the two metal frames, provide the desired stiffness and damping of the system.
• gap 19 between the two metal frames is of the order of 8 mm.
• gap 19 has a value between 1 mm and 50 mm.
• another arrangement and another number of elastomeric elements may be used.
• elastomeric elements 18 are arranged in a symmetric manner around inner frame 14.
• Elastomeric elements may also be provided above or below disk 12. Other arrangements may be used for devices or receptacles that are not box-like.
• Fig. 2 A illustrates a top surface 20 of inner frame 14 comprising weight sockets 22, distributed along it.
• Modular weights 24 are shown inserted in the two middle sockets.
• modular weights 24 are mechanically attached to sockets 22 with bolts 26.
• Bolts 26 may be, for example, corner bolts, as shown, or center bolts.
• modular weights 24 are glued to top surface 20 with an adhesive.
• modular weights 24 are mechanically attached to top surface 20 in any other known manner that insures strong hold under vibration and shock.
• sockets 22 may be on the sides and/or bottom of frame 14 or at angles thereto, alternatively or additionally to being on top 20.
• Figs. 3A and 3B illustrate two additional exemplary arrangements of sockets for weights 24 on top surface 20 of inner frame 14, in accordance with some other exemplary embodiments of the invention.
• Fig. 3A illustrates a modular weight arrangement that includes modular fractions of weights, such as socket for a half weight 23.
• Fig. 3B illustrates a modular weight arrangement of concentric rings, such as weights 25 and 27. These different weights may have same or different weights.
• the socket arrangement need not be rotationally and/or mirror symmetric, in any axis.
• the isolation system is provided pre- packaged with a set of weights and an instruction sheet, associating weight combination and/or arrangements with particular isolated devices and/or vehicles.
• this allows a single device that includes an isolated component to be easily ported between different vehicles. Alternatively or additionally, this simplifies the work of a system integrator, faced with a plurality of possible devices, vehicles and/or components, in a single manufacturing line.
• Fig. 4 illustrates a pre-fabricated, integral isolating system 34 to which modular weights have been added in a manner that maintains it as a "center-of-gravity" system, in accordance with an exemplary embodiment of the invention.
• a "center-of-gravity" system the center of gravity of the system coincides with an elastic center around which vibration takes place.
• modular weights 24 have been added both to top surface 20 and to a bottom surface 36, in a symmetric manner. In some cases, the arrangement complements an asymmetry of the isolated device.
• a point 32 is both the center of gravity and the elastic center, both before and after the addition of modular weights.
• different weight designs may be added to top surface 20 and to bottom surface 36, while the weight addition to top surface 20 and to bottom surface 36 is substantially the same.
• the center of gravity may be maintained, for example, in one, two or three axes.
• elastomeric elements 18 are designed as buckling-column elements, and elastomeric elements 38 are designed as domes, or cylinders. Alternatively, other geometric shapes may be used.
• the isolating system such as isolating system 10, comprises only elastomeric elements 18.
• maintaining a center of gravity of the isolated system may not be essential. In other applications, maintaining a center of gravity may be desirable.
• Fig. 5 illustrates that when the damping factor is relatively low, transmissibility is very sensitive to weight changes. But when the damping factor is relatively high, transmissibility is far less sensitive to weight changes., as follows: a.
• Figs. 6A and 6B summarize with a flow chart 100 a process of tailor-fitting an isolating system to a specific vehicle type, by tuning the natural frequency (and with it the transmissibility) to desirable values with modular weights, in accordance with an exemplary embodiment of the invention, as follows: a. At 102, a request for a pre-made or pre-fabricated integral isolating system for a specific type of a light-weight device, a specific type of vehicle, specific environmental conditions and an allowable transmissibility value is received; b. At 104, forced frequencies of the vehicle near or at the location that the isolating system will be installed are provided.
• Measurements at the vehicle-fabrication site may be performed when the information is not available; c.
• the most appropriate pre-fabricated, integral isolating system is selected based on the type of the device, the range of forced frequencies, and the environmental conditions that may be incurred; d.
• the natural frequency and the transmissibility values of the assembly of isolating system and device are calculated with high-accuracy, optionally using a finite- element method, at the isolating system manufacturing site; e.
• an evaluation is made: Is the addition of modular weights necessary to achieve the desired isolation? f.
• modular weights are attached to the isolating system, at the isolating system manufacturing site; and g.
• the isolating system comprises any one or a combination of any of the following: a. Elastomeric elements manufactured as a fully bonded sandwich (metal-rubber-metal, with rubber to metal bonding, optionally by a "transfer molding” process). b. Elastomeric-elements that are resilient and return to an initial position after being exposed to external loading. c. Elastomeric-elements that are designed to withstand various loads in tension, compression, shear and buckling.
• Elastomeric-elements that are designed to withstand sinusoidal vibrations as well as random vibrations (for example, for an aircraft with a turbo-propeller engine.) and shocks (for example, upon an aircraft landing).
• Elastomeric-elements that are designed to withstand a static load (for example, a self- weight of parts of the isolating system and/or of disk 12, under normal gravity and/or due to acceleration, for example, upon an aircraft making a high-speed turn).
• Elastomeric-elements that have a service life longer than the expected usable life of the device.
• the isolating system is specifically designed for optimum performance in any one of the following: a. a forced frequency range of 10-20 Hz; b. a forced frequency range of 20-30 Hz; or c. a forced frequency range of 30-50 Hz.
• the invention is not limited to the range of forced frequencies described here, and optimum performance may be designed for another range of forced frequencies.
• Neoprene for example, for high strength, good fatigue properties, low to medium damping properties, oil resistance and a temperature range higher than -18°C but lower than 80°C;
• ® e. silicon-based elastomers such as Lord MED, or MEE of Lord Corp., Erie, PA USA, for example, for medium or low damping and high consistency over a wide range of temperatures down to -57°C.
• the invention is not limited to the types of elastomers described here, and other types of elastomeric elements may be used instead.
• the modular weights have equal weights.
• the modular weights have unequal weights, for example designed with incremental steps that result in equal natural frequency step changes. For example, for 500- gram assembly 21, a modular weight addition of 117 g will reduce the natural frequency from 20 Hz to 18 Hz, a second modular weight addition of 164 g will reduce the natural frequency further to 16 Hz.
• the system is designed so that the modular weights together represent between 50% and 300% of the initial weight of assembly 21 and or the weight of disk 12.
• the modular weights are designed so that together they represent between 300%) and 800% of the initial weight of assembly 21.
• the modular weights are designed so that together (when all the sockets are full) they represent between 800%) and 1200%) of the initial weight of assembly 21.
• a system of modular weights includes between 2 and 20 modules. Alternatively, only one modular weight (which may be a concentric ring), or a number of weights greater than 20 may be used.
• the invention is not limited to the range of weight and to the number of modular weights described here, and another range of weight percent and another number of weights may be used.
• the same modular weight designs may be used for different pre-fabricated, integral isolating systems, for example, for prefabricated, integral isolating systems manufactured with different elastomeric material, or a different overall design, or for different environmental conditions, or for a different forced frequency range.
• modular weights of the same shape and size, but of different weights are provided, from different materials, for different applications.
• isolating system 10 or isolating system 34 are designed in a manner that allows overall assembly 21 to be detached from its slot in the vehicle, and be reinserted.
• a pre-fabricated isolation system is used for convenient supply of qualified embedded devices, for example, for the aerospace industry.
• qualified embedded devices for example, for the aerospace industry.
• the isolation and qualification stages, for a particular component are quite long, so the manufacturer purchases a large number of components.
• the purchased components are used up, it may not be possible to obtain new components, for example, due to changes in manufacturing lines at the component manufacturers.
• a qualification service provider provides isolated and qualified components to system manufacturers, by purchasing off-the-self components and qualifying them, using an isolation system, for example as described above.
• the isolation systems may be purchased from an isolation system manufacturer.

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• 1999
  • 1999-11-03 IL IL13273299A patent/IL132732A0/xx unknown
• 2000
  • 2000-11-02 WO PCT/IL2000/000712 patent/WO2001033103A1/en not_active Application Discontinuation
  • 2000-11-02 EP EP00973193A patent/EP1228324A1/de not_active Withdrawn

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