MXPA99004963A - Gas compressor - Google Patents

Gas compressor

Info

Publication number
MXPA99004963A
MXPA99004963A MXPA/A/1999/004963A MX9904963A MXPA99004963A MX PA99004963 A MXPA99004963 A MX PA99004963A MX 9904963 A MX9904963 A MX 9904963A MX PA99004963 A MXPA99004963 A MX PA99004963A
Authority
MX
Mexico
Prior art keywords
air compressor
air
compressing
rotated
gravity
Prior art date
Application number
MXPA/A/1999/004963A
Other languages
Spanish (es)
Inventor
Lin Ynglang
Original Assignee
Lin Ynglang
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 Lin Ynglang filed Critical Lin Ynglang
Publication of MXPA99004963A publication Critical patent/MXPA99004963A/en

Links

Abstract

This invention relates to a gas compressor including several compression units that can respectively compress air and generate a lot of compressed gas with little power. These compression units are mounted on the rotary or rotated assemblies and are able to rotate therewith, and the air is compressed while the said units are turning down withthe aid of gravity.

Description

AIR COMPRESSOR FIELD OF THE INVENTION The present invention relates to an air compressor, particularly to an air compressor that compresses air by gravity and that has a plurality of air compressor devices, capable respectively of compressing air automatically and continuously in a repeated and natural manner, and generating a large amount of compressed air, but which requires only very little energy.
ANTECEDENTS OF THE TECHNIQUE With the previous conventional air compressor it is necessary to consume a lot of electricity; therefore, it is necessary to improve the conventional air compressor or develop new energy or power. The present invention provides an air compressor having a plurality of air compressing devices, capable respectively of naturally compressing natural air and generating a large amount of compressed air, but which requires that only very little energy be provided to users for their use and get the essential energy.
BRIEF DESCRIPTION OF THE INVENTION The present invention provides an air compressor that compresses air by gravity and that has a plurality of air compressing devices, capable respectively of automatically and continuously compressing in a repeated and natural way natural air and generating a large amount of compressed air, but which it requires only very little energy. The plurality of air compressing devices are installed to a rotatable / rotated member and to rotate therewith about the axis following the rotation of the rotatable / rotated method and to drive downward respectively and naturally to compress air by an air compressing member inside its cylinder-like member.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side view of the first embodiment of the air compressor according to the present invention. Figure 2 is an enlarged side sectional view of a similar tundish member providing a support for embedding and a hollow shaft supported through the support and a rubber cap having a central hole providing cover for an exterior side of the support and which provides an end portion of the hollow shaft to be threaded therein and a container that receives and stores the compressed air from the hollow shaft etc. of the air compressor of the present invention. Figure 3 is a side view of a second embodiment of the air compressor of the present invention.
DETAILED DESCRIPTION OF THE INVENTION As shown in Figure 1, the air compressor of the present invention comprises: A plurality of air compressor devices that are respectively attracted by gravity naturally driven downward to compress natural air by gravity; A rotatable / rotated member (for example a rotatable hollow shaft 1) provided for installing the plurality of air compressor devices and discharging all of the compressed air, compressed by the plurality of air compressing devices; The plurality of air compressor devices 2,3,4,5,6,7,8,9 are installed to the rotatable hollow shaft 1 or to the rotated member to rotate together about the axis following the rotation of the rotatable hollow shaft 1, and are attracted respectively by gravity and naturally driven downward to compress natural air by gravity and to generate a large amount of compressed air to be provided to the user for use and to obtain essential energy, when each of the plurality of devices Air compressors rotate respectively around the axis to a certain height position on a vertical line (vertical position) or around it; Each of the plurality of air compressing devices comprises a long cylinder-like member (a long air chamber denoted by the reference numerals 2,3,4,5,6,7,8,9) and a compressor member 10 u 1 1 similar to solid piston, very heavy length (an appropriately long and heavy piston) inside the long cylinder and can push down to compress the natural air by gravity only and without using any energy, two air intakes 2 respectively can open / close automatically to allow / restrict the natural air entering the long cylinder of each air compressor device; and A short duct 12 or 13 and others constructed to install each air compressor device and carry out the compressed air compressed from each air compressor device, and to restrict the compressed air to discharge only a restricted amount to generate a pressure appropriate high, then to discharge the compressed air; Two holders 14, 15 having respectively a seal type holder 16, 17 and are respectively to support two ends of the hollow shaft rotatable one or the rotated member and to allow the rotatable hollow shaft 1 or the rotated member to rotate; A receiving container 19 for receiving and containing all the compressed air, compressed by each of the plurality of air compressing devices, and fixed to one of the two carriers 14, 15, but does not rotate together with the rotatable hollow shaft 1; A speed reducing device, namely a work-saving actuator device, formed with the pivoted member, for driving the rotatable hollow shaft 1 or the rotated member at low speed and placing the air compressor member 10 or 11 to compress automatic air and continuously in a repeated way, saving a lot of work; A controller device that is formed by mounting each of the air compressor devices to the hollow shaft rotatable to the rotated member to bring the air compressor member down to a position to be attracted by gravity; A sealing member, namely a rubber cap 20, having a central opening that can provide an end portion of the rotatable hollow shaft 1 for insertion therein and can be attached to the end portion of the rotatable hollow shaft 1, a so as to seal a very small space of one of the supports 17 of the two supports and can restrict the air inside the receiving container 19 from leaking out of very small space; An ignition switch 18 or controller 45; A container 21 that stores and increases the pressure of all the compressed air; and A base 22 providing the installation of the two carriers 14, 15 and the speed reducing device and the container 21 etc.
The rotated member (or for example, the hollow shaft rotated 1) is rotated by the speed reducing device, not at a high speed but at an appropriately low speed, and is therefore not generating a centrifugal force and can The plunger 10, 11 of each air compressor device is naturally driven downward to compress air, when each air compressor device rotates to a position on or around the vertical line. The rotatable shaft 1 provides not only the installation of the short hollow duct 12 or 13 of each air compressor device, but also to connect the lower end of the cylinder of each air compressor device, in order to install each of the plurality of air compressors. air compressing devices on its circumference and then provides the reception to discharge all the compressed air out to the receiving container 19 of the end portion to its hollow portion and provides the drive for the speed reducing device and to form the saving driving device work and to drive the plurality of air compressor devices to rotate. The plurality of air compressing devices are installed to the hollow rotatable shaft 1 along the radial direction and similarly to spokes, to then rotate together about the axis following the rotation of the rotatable hollow shaft 1 so that the compressive member 10 or 11 within each air compressor device is attracted by gravity and naturally driven downward to compress air, when each air compressor device is driven to the position of a certain height by the work-saving actuating device. The long, very heavy, solid, piston-like air compressor member 10, 11 of each air compressor device is a solid plunger and is heavy and not a hollow piston like that of a conventional compressor and is inside the long similar member to cylinder. The air compressor according to the invention further includes: each air compressor device, as rotated with the rotation of the rotatable member (for example, the rotatable hollow shaft 1) or the rotated member and rotates the axis of rotation rotation in a circle, and has the function that makes it able to push down and compress air twice as the long and very heavy piston 10 or 11, of the air compressor device is able to be attracted by gravity and drive naturally downward and compress air by gravity and it is not necessary to use any external power or energy, when each air compressor device about the axis to a position on a lower end, or around it, of the vertical line. Each long cylinder 2 of each air compressor device further comprises a conveyor conduit 23 or 24 for conveying compressed air out to a lower air chamber of the long cylinder, after closing the compressed air with the short conduit 12 or 13 of each device. air compressor. The two air intakes are respectively located at the two ends of the long cylinder (air chamber) of each air compressor device and are respectively formed by an opening 25 or 26 and a first and second valve 27 or 28 and have an appropriate weight and located below the opening 25 or 26, namely located inside the long cylinder, whereby not only the second valve 28 can automatically close to restrict the discharge of the compressed air, and the first valve 27 can automatically open towards the inside of the long cylinder and to allow natural outside air to be attracted to the long cylinder, when each air compressor device is rotated respectively to a position on the lower end, or around it, in the vertical line, when the plunger is driven down to compress natural air, but also the valve 27 can close automatically to restrict the discharge of compressed air, and valve 28 can automatically open into the long cylinder and allow natural outside air to be attracted to the long cylinder, when each air compressor device rotates respectively to a position on or around the upper end, of the vertical line and with the plunger 10 or 11 is pushed down to compress the natural air. A hollow portion of the short duct 12 or 13 of each air compressing device has respectively a cone valve 29 which is air inlet, is larger than its outlet (i.e. suction port 30), particularly, has a thin elastic part 31 in front of the suction hole 30, and can be pushed open when the cone valve 29 is pumping air, so that the cone valve 29 allows the air comprising device to pump air respectively to the rotatable hollow shaft 1, but does not allow the air retract. The conveyor conduit 23 or 24 of each air compressor device respectively has a smaller cone valve 32 having its function as the cone valve 29 and a smaller elastic thin piece 33 having its function as that of the elastic thin piece. 31, namely the conveyor conduit 23 or 24 has a smaller one-way valve which has its function as that of the cone valve 29, so that it opens only as each of the air compressors rotates respectively to a position on the lower end, or around it, of the vertical line, but does not allow compressed air to enter an upper air chamber of the long cylinder of each air compressor device. The cone valve 29 can restrict the compressed air from being pumped only to the rotatable hollow shaft 1, but not allowing it to retract; also, it can reduce the sound caused by the momentum of the plunger plunged, long and very heavy of each air compressor device when the long and very heavy, long and heavy plunger 10 or 11 of each air compressor is driven down to compress air. The rotatable hollow shaft 1 comprises means for connecting two smaller hollow ducts 1A, 1 B respectively to two ends of a larger and shorter hollow duct 4 or another larger and shorter hollow member 1 C, in order to insert and connect short duct 12 or 13 of each of the air compressor devices unlike the larger and shorter hollow member 1 C and install each of the air compressor devices thereto. The rotatable hollow shaft 1 comprises: its end position 1 D which is sealed (this end portion 1 D is not connected to the receiving container 19). The two ends of the rotatable hollow shaft 1 are respectively installed on the two supports 14, 15 which respectively have the seal type support 16, 17, so that they can be easily operated and rotated by the speed reducing device and rotate at the same time each air compressor device. The seal type supports 16, 17 are respectively installed on an upper end of each of the two carriers 14, 15. The other end portion 1 E of the rotatable hollow shaft 1 is inserted in the receiving container 19 and for unloading or transporting outwardly all the compressed air to the receiving container 19, to be then provided to the user for use. The end portion 1 E of the second end of the rotating hollow shaft 1 has a cone valve 34 having the function as that of the cone valve 29 and an elastic thin piece 35 having the function as that of the elastic piece 31, so that it can restrict only that all the compressed air is pumped to container 21, but does not allow air to retract. As shown in Figures 1 and 2, the receiving container 19 is combined with the other end portion 1 E of the rotatable hollow shaft 1, namely, the annular flange 19A of the opening of a notch in the receiving container 19 is connected together with an annular flange 36A of a support housing, namely a similar tundish cap 36A, the similar tundish cap 36 has a central opening 36B provided so that the compressed air is discharged from the rotatable hollow shaft 1 and passes through and enters the receiving container 19. Provided between the annular flange 19A of the receiving container 19 and the flange 36A of the similar tundish cap 36 is a washer 19B, the washer being in layers and preventing the compressed air from leaking. The similar tundish bushing 36 is provided for embedding therein a seal type holder 17 of one of the two carriers 14, 15, so that the container 19 does not rotate following the rotation of the rotatable hollow shaft 1, but can receive and storing all the compressed air transported respectively outward from the short conduit 12 or 13 of each air compressor device, can then provide the discharge of the compressed air so that it is stored in the container 21, so that it is provided to the user for use. The very small space 17A of the type support 17 is located between the outer circumference and a central hole of a cover 17B of the seal type holder 17 and an outer transparency of a central hole on one side of the seal type holder 17 it is sealed by a similar rubber cap trough 20. The similar rubber cap trough 20 has a central hole that can make sure that the end portion 1 E of the rotatable hollow shaft 1 is inserted thereto and has a flange 20A that can be connect the flange 36A of the similar trough 36 and leave it there. The central hole of the similar rubber cap trough 20 is appropriately and hermetically joined on an outer circumference of the other end portion 1 E of the rotatable hollow shaft 1 and can thus prevent the compressed air from leaking. The first end of the short conduit for example 12 or 13 of each air compressor device is respectively connected to the central portion of the lower end of the long cylinder of each air compressor device and the second end of the short conduit 12 or 13 is inserted and is installed in connection on the circumference of the largest and shortest hollow member 1 C of the rotatable hollow shaft 1, in order to fix and install each air compressor device and discharge the compressed air to the rotatable hollow shaft 1. Each air compressor device further comprises two groups of the cushion device 39, 40 for reducing the driving force of the plunger 10 or 1 1, in order to reduce the sound produced by the plunger 10 or 11, when the plunger is driven down to compress the air. Also, the height of one of the two groups of cushion devices 39, 40 must be appropriate, such that part of the compressed air can be retained within the long cylinder of each air compressor device; consequently, the retained compressed air can reduce the force of the piston impulse and reduce to a certain extent the sound produced by the piston, when the piston is being pushed down to compress the air to a certain degree. Two groups of cushion devices are respectively rubber cushions or air cushions or compression springs or oil cushions. With the help of motor 37, the speed reducing device activates a pulley 38 of smaller size, which pulls together a band 42 and drives a larger size pulley 41, whereby the speed reducing device does not only make it is possible for the rotatable hollow shaft 1 to rotate at an appropriately low speed and drive the plurality of air compressor devices to rotate and cause the plunger of each air compressor device to be brought respectively by gravity and driven downward to compress air through gravity and without the power or external energy; The speed reducing device also has a very large force which makes it possible for the rotatable hollow shaft 1 to rotate with only low energy (little electricity). The larger pulley 41 is many times larger than the smaller pulley 38 even larger than the pulley 41 shown in Fig. 1. The speed reducing device is driven to rotate by any other power. The speed reducing device is an actuator device of a work-saving device and cyclization devices. The means for driving the speed reducing device of the air compressor of the present invention further includes a small pneumatic motor 43 (please see the portions with dashed lines inside the motor 37) which is driven by air pumped in advance to the container 21, without completely using external power or energy, particularly, because the plurality of air compressor devices are not necessarily rotating at high speed, so that only by using the speed reducing device and with only low energy, therefore, the Small pneumatic motor 43 is using only a very small amount of compressed air, so that large amounts of all the compressed air generated by the plurality of air compressing devices are able to enlarge the very small amount of the actual demand of the small air motor 43 and capable of exceeding large quantities. The container 21 has a conduit 44 controlled by a control valve 45 (which is an actuator switch) and can supply a very small amount of the compressed air to the small air motor 43. Due to the above designs, the air compressor of the present invention is capable of continuously compressing air to generate a large amount of compressed air, then supplying it to the user for use and obtaining the essential energy using only gravity and very little energy (little electricity) to drive an engine 37 of the reducing device. speed; or using only the gravity and the very small amount of compressed air, to drive the small air motor 43 of the speed reducing device. The receiving container 19 has a duct 46 which can carry out all the compressed air of the container 21.
The plurality of air compressor devices is very firmly connected together by a combination ring 47 after each air compressor device is installed on the rotatable hollow shaft 1. The container 21 comprises an adjustable vacuum 48, so that the user it can discharge part of the compressed air into the container 21, when necessary, in order to regulate and control the pressure of the compressed air within the container 21 to a significant degree. A combination ring 47 having an ignition handle 49 makes it possible for the user's hands to rotate the rotatable hollow shaft 1, in order to drive a plurality of air compressor devices to rotate about the axis, so that each The air compressor device compresses air respectively to the container 21 and stores therein later to supply air to drive the small pneumatic motor 43 to operate continuously and to drive the rotatable hollow shaft 1 or the rotated member 1 to rotate continuously and to drive the plurality of air compressor devices to rotate respectively. The long and very heavy solid piston of each air compressor device further comprises a piston ring having a function as that of the conventional piston. The long and very heavy solid piston and the long cylinder of each air compressor device are each made in a way that includes a quadrangle.
The air compressor of the present invention further comprises a small convex control shoulder 50 (so small that it is similar to a hemispherical protuberance), installed in the concave portion within the long cylinder of each air compressor device that can automatically protrude in a manner lightly outward or backward to control the long, very heavy solid plunger of the air compressor device to propel down only as the plunger rotates to a position on or around the vertical line, which is capable of controlling the Solid piston, long and very heavy so that it does not push down before it reaches a position on the vertical line, or around it. For coupling the small convex control jump 50, the arms of the two ends of the long and very heavy solid piston of each air compressor device are respectively formed in the form of an arc, so that not only the long and very heavy solid piston it can compress and easily pass the small convex control shoulder 50 and can be pushed down to compress air, when it rotates to the upper end of the vertical line, but can also easily be retracted to its original position to propel downwards and compress air again , when the solid, long and very heavy piston rotates to the lower end of the vertical line. The container 21 comprises a pressure gauge 52 and a vacuum 53 provided for the user to use the compressed air within the container 21.
According to the second embodiment of the air compressor of the present invention, it further comprises several means for appropriately extending and enlarging the rotatable hollow shaft or the rotated member shown in Figure 2, and installing at least two groups, even more groups of the plurality of air compressor devices 54, 55, 56, 57, 58 to the rotatable hollow shaft or the rotatable member 59 extended or enlarged (as shown in Figure 3) and increase the power of the speed reducing device and enlarge the volumes of the receiving container 19 and the container 21, and extending the frame 22 more time until it reaches the base portion 22A etc, in order to generate much more quantities of compressed air. As shown in Figure 3, the air compressor of the second embodiment of the present invention further comprises links 59 A, 59 B for linking the combination ring 47 of each of at least the two groups or more groups of the plurality of air compressor devices 54, 55, 56, 57, 58, in order to strongly fix the two groups or more groups of the plurality of air compressor devices. The frame 22 comprises several holes 60 or 61 that can be provided for the user to insert a bolt and to fix the air compressor according to the invention.
BEST EXECUTION OF THE INVENTION The optimal application of the invention different from that shown in Figure 1 comprises a plurality of air compressor devices that are installed to the rotatable hollow shaft 1 and is driven at an appropriately low speed by means of a speed reducing device and rotated together around an axis following the rotation of the rotatable hollow shaft 1 (ie rotate together with the rotation of the rotatable member) and to be respectively attracted by gravity and propelled downward to compress the natural air by gravity and generate a large amount of compressed air when each of the plurality of air compressing devices rotates respectively about an axis to a position on a vertical line, or around it, the plurality of air compressing devices is installed even with more groups (as shown in figure 2), in order to generate much more quantity of compressed air. And the rotatable hollow shaft 1 is rotated at an appropriately low speed by the speed reducing device that generates an energy by means of a motor or a small pneumatic motor that is driven by a very small amount of air inside the container 21 pumped to the same in advance.
Industrial Application The air compressor of the present invention is capable of naturally compressing natural air, using only very little energy or electricity, even with only a very small amount of the compressed air to generate a much larger amount of compressed air to provide the essential energy. This widely industrial application is appreciated.

Claims (15)

NOVELTY OF THE INVENTION CLAIMS
1. - A method for compressing air by natural energy, which comprises means for compressing air to generate compressed air and obtain a large amount by attracting gravity, attracting an air compressor member inside an air compressor device to naturally propel it toward below, namely by gravity of said air compressor member to naturally propel it downwards.
2. A method for compressing air according to claim 1, further characterized in that said air compressor member is a kind of air compressor member similar to a solid and very heavy piston, rather than a hollow piston like that of a compressor of conventional air.
3. A method for compressing air by natural energy, which comprises means for compressing air to generate compressed air to obtain a large energy by attracting gravity, attracting an air compressor member inside an air compressor device to propel itself naturally downward, namely by the gravity of said air compressor member to naturally propel downwardly and by means of an actuator device which requires using only very little energy, much smaller than said large power, to drive said air compressor member to a position at a certain height, in such a way that said air compressor member is subjected to its attraction by gravity, and using a control device to lower said air compressor member to be attracted by gravity from said certain height position and to naturally push down, when said air compressor member is actuated or by said actuator device.
4. A method for compressing air according to claim 3, further characterized in that said air compressor member is a kind of air compressor member similar to a solid and very heavy piston, rather than a hollow piston like that of a compressor of conventional air.
5.-. A method for compressing air according to claim 3, further characterized in that said actuator device and said control device are further able to operate automatically and continuously repeatedly, so as to be possible for said air compressor member to be automatically attracted. and continuously repeatedly by gravity and of naturally pushing down to compress air.
6. A method for compressing air in accordance with claim 3 or 5, further characterized in that said actuator device is a speed reducing device of the labor-saving type.
7. - A method for compressing air according to claim 3, further characterized in that said very little energy is supplied by a small portion of compressed air quantity included in said compressed air.
8. An air compressor for compressing air by natural energy, comprising: a work-saving actuating device comprising a rotated member and a speed reducing device, said speed reducing device requiring only very little energy to drive said rotated member to rotate and actuate an air compressor device that is mounted on said rotated member to rotate around following a rotation of said rotated member and to move an air compressor member within said air compressor device to a certain height position on a vertical line, or around it; a control device that is formed by mounting said air compressor device on said rotated member, for lowering said air compressor member inside said air compressor device so that it is attracted by gravity and so that it is naturally driven down to compress air, when said air compressor device is moving and rotating to said position of said certain height by said work-saving actuating device, said air compressor devices being mounted on said rotated member.; a receiving container for receiving and containing compressed air, compressed by said air compressor device; and a base for mounting said rotated member and said air compressor device, in order to be driven by said labor-saving actuator device etc., whereby said air compressor devices can rotate around following the rotation of said rotated member and make descending said air compressor member into said air compressor device so that it is attracted by gravity and is naturally driven downward and generates a large amount of compressed air and thus obtain very large energy, when said air compressor member rotates to said air compressor member. position of said certain height on a vertical line, or around it.
9. A method for compressing air according to claim 8, further characterized in that said air compressor comprises a plurality of said air compressor devices.
10. A method for compressing air according to claim 9, further characterized in that said plurality of said air compressor devices is arranged in series and mounted on said member rotated in the manner of spokes. 1.
A method for compressing air according to claim 8 or 9, said plurality of said air compressor devices further comprising a cylinder-like member and a very heavy air compressing member within said cylinder-like member.
12. A method for compressing air according to claim 8 or 11, further characterized in that said air compressor member is a kind of air compressor member similar to a solid and very heavy piston, rather than a hollow piston as that of a conventional air compressor.
13. A method for compressing air according to claim 8, further characterized in that said very little energy is supplied by a small portion of compressed air quantity included in said compressed air.
14. A method for compressing air according to claim 10, further characterized in that said air compressor also comprises at least two or more groups of said plurality of said air compressor device, in order to generate much more amount of air compressed.
15. A method for compressing air according to claim 8, further comprising a controller for controlling and restricting said air compressor member of said air compressor device to propel downward and compress air only when said air compressor member of said air compressor device is rotated about said position of said certain height on said vertical line, or around it. SUMMARY OF THE INVENTION The present invention relates to an air compressor which compresses air by natural energy, viz. It refers to a method for compressing air by natural energy, comprising means for compressing air and generating a large amount of compressed air and obtaining an energy large by attracting gravity to attract an air compressor member similar to a solid and very heavy piston inside an air compressor device to naturally propel downward, to 10 know by gravity of the air compressor member similar to a solid and very heavy piston to naturally push down and by means of a work-saving actuator device which requires using only very little energy, much smaller than the large power, to drive the member air compressor to a position of certain height on a line Vertical, or around it, in order to make it possible for it to be attracted to the ** < * r gravity, and controlling a device for lowering the air compressor member to be attracted by gravity and to naturally push down, when the air compressor member is driven to a certain height position by the saving actuator device 20 work; the work-saving actuator device thus formed comprises a rotated member and a speed reducing device which requires using only very little energy and making it possible to actuate the rotated member to rotate and urge an air compressor device mounted on the rotated member for which rotates around following the rotation of the rotated member and moving an air compressor member within the air compressor device to the position of the certain height, the control device being formed namely by mounting the air compressor device to the rotated member, to make descending the air compressor member so that it is naturally pushed down to compress air, when the air compressor device is rotated to the position of the certain height; The air compressor further comprises a plurality of air compressor devices mounted on the rotated member to generate much more of the compressed air. GC / cgm * ald * amm P99-701F
MXPA/A/1999/004963A 1996-11-26 1999-05-26 Gas compressor MXPA99004963A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US756980 1996-11-26

Publications (1)

Publication Number Publication Date
MXPA99004963A true MXPA99004963A (en) 2000-09-04

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