MXPA96005238A - Single-phase induction motor and ro assembly apparatus - Google Patents
Single-phase induction motor and ro assembly apparatusInfo
- Publication number
- MXPA96005238A MXPA96005238A MXPA/A/1996/005238A MX9605238A MXPA96005238A MX PA96005238 A MXPA96005238 A MX PA96005238A MX 9605238 A MX9605238 A MX 9605238A MX PA96005238 A MXPA96005238 A MX PA96005238A
- Authority
- MX
- Mexico
- Prior art keywords
- rotor
- assembly
- core
- core assembly
- die
- Prior art date
Links
- 230000001939 inductive effect Effects 0.000 title claims abstract description 20
- 238000004512 die casting Methods 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 230000037250 Clearance Effects 0.000 claims abstract description 10
- 230000035512 clearance Effects 0.000 claims abstract description 10
- 230000001965 increased Effects 0.000 claims description 4
- 230000003247 decreasing Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
The present invention relates to a single-phase induction motor comprising a main winding, an auxiliary winding that is positioned so that an electrical angle of the auxiliary winding is different from that of the main winding, a plurality of drive capacitors that are connected to the auxiliary winding a relay for controlling the on / off of the capacitors in response to a driving load, and a rotor having openings on the open side (circumference side) of the slots. The invention further relates to a rotor assembly apparatus comprising a bushing into which the rotor core assembly for die casting is inserted, wherein a clearance between the bushing and the rotor core assembly is narrower up to the said rotor core assembly degree can be separated after die-casting, and a core band having a clearance between the core band and the hub in the circumferential direction of said hub, the core band is coupled with the core. bushing so that the movement in the direction of the axis is restricted. The present invention can prevent a generation of electromagnetic noise even during high load and high torque operation
Description
SINGLE-PHASE INDUCTION MOTOR AND ROTOR ASSEMBLY APPARATUS
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a single-phase induction motor in a hermetic compressor used in a refrigerator or air conditioner.
Description of the Prior Art Fig. 11 is a cross-sectional view of a rotor 9 of a conventional single-phase induction motor described in Japanese Utility Model Publication Publication No. 58-172015. In fig. 11, the rotor 9 comprises a circumference 9a of the rotor 9, slot portions 12 filled with die-cast aluminum, which constitute a closed space in the rotor 9, teeth 13 between each slot portion 12 and bridges 14 for connecting each tooth 13 on the side of the circumference of the rotor 9a, respectively. Fig. 12 is a cross-sectional view of a rotor 9 of a conventional single-phase induction motor described in Japanese Utility Model Publication Open to Inspection No. 60-39352. In Fig. 12, the rotor 9 comprises a circumference 9a of the rotor 9, slot opening portions 12a. and teeth 13 respectively. In the rotor 9 of Fig. 11, the slot portion 12 constitutes a closed space in the rotor 9. The interior of the enclosed space is filled with die-cast aluminum. Since the shape of the slot portion 12 is closed, it is generally referred to as a closed slot. In other words, the bridges 14 are located between the rotor circumference 9a and the respective slot portions 12 for connecting each tooth 13. The efficiency of a motor is improved, if the width of the bridge 14 becomes narrower. However, a narrower bridge tends to generate a magnetic saturation and causes electromagnetic noise. A large electromagnetic noise is generated particularly during a high torsion operation when a capacitance of a driving capacitor is large. The rotor 9 in Fig. 12 shows an example of open slots, having slot openings 12a instead of bridges 14 connecting each tooth 13 between the slot portion 12 and the rotor circumference 9a. However, the rotor circumferences 9a have to be trimmed or smoothed after the die-casting process which is carried out after a core rolling process, because the aluminum leaves the slot opening 12a towards the circumference during the process of die-casting of aluminum.
A conventional single-phase induction motor constructed in the above manner has the following problems: (1) The rotor 9 having closed grooves tends to generate magnetic saturation due to the narrow bridges 14 during a high torsion operation when a capacitance of a capacitor drive is large and, generates an electromagnetic noise that causes a lot of noise during the operation. (2) The rotor 9 having open slots needs cutting or smoothing of the circumference of the rotor 9a after die-casting, because the aluminum leaves the slot openings 12a towards the circumference during the die-casting process of the die. aluminum. It is an object of the present invention to provide a single phase induction motor that can suppress the generation of electromagnetic noise even during a high torsion operation when a capacitance of a driving capacitor is large. It is another object of the present invention to provide a rotor assembly apparatus which eliminates the need to cut or smooth the surface of the circumference of the rotor after the die-casting process if a rotor having open slots is used, preventing the aluminum leave the slot openings during die-casting of the aluminum.
BRIEF DESCRIPTION OF THE INVENTION
According to one aspect of the invention, a single-phase induction motor comprises a main winding; an auxiliary winding that is positioned such that an electrical angle of the auxiliary winding is different from that of the main winding; a plurality of drive capacitors connected to the auxiliary winding; a relay to control the switching on / off of the capacitors in response to a driving load; and a rotor having openings on the open side (circumferential side) of the grooves. According to another aspect of the invention, a rotor assembly apparatus comprises a bushing into which the rotor core assembly for die casting is inserted, wherein a clearance between the bushing and the rotor core assembly it is narrower to the degree said rotor core assembly can be separated after die-casting; and a core band having a clearance between the core band and the hub in the circumferential direction of said hub, the core band is engaged with the hub so that movement in the direction of the shaft is restricted. According to a further aspect of the invention, a rotor assembly apparatus comprises a mandrel within which a rotor core assembly is inserted for die-casting of aluminum, wherein, the clearance between the core assembly of The rotor and the oil pressure mandrel are increased during the insertion of the core assembly by decreasing the oil pressure and, said free space is narrower during the die casting by increasing the oil pressure.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a single-phase induction motor according to the first embodiment of the present invention. FIG. 2 is a diagram showing a noise level of the electromagnetic noise generated in the single-phase induction motor according to the first embodiment of the invention. FIG. 3 is a diagram showing a curve of the noise level for the electromagnetic noise frequency generated in the single-phase induction motor according to the first embodiment of the invention. FIG. 4 is a diagram showing a curve of the noise level for the frequency of the electromagnetic noise generated in the single-phase induction motor according to the first embodiment of the invention. FIG. 5 is a cross-sectional view showing how to press fit a rotor core assembly into a hub in a rotor assembly method according to a second embodiment of the invention.
FIG. 6 is a cross-sectional view of a die-cast assembly according to a second embodiment. FIG. 7 is a cross-sectional view showing the separation state of the rotor core assembly of the hub according to the second embodiment. FIG. 8 is a flow diagram showing how to manufacture the rotor assembly according to the second embodiment. FIG. 9 is a cross-sectional view of the rotor assembly apparatus of the third embodiment of the invention. FIG. 10 is a flow diagram showing how to manufacture the rotor assembly according to the third embodiment. FIG. 11 is a cross-sectional view of a rotor (closed slot) of a conventional single-phase induction motor.
FIG. 12 is a cross-sectional view of a rotor (open slot) of a single-phase induction motor.
DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Modality 1. A first embodiment of the present invention is described by reference to the drawings. FIG. 1 is a circuit diagram of a single-phase induction motor according to a first embodiment of the invention, comprising a single-phase induction motor 1, a main winding 2 which is wound around a stator of the electric motor 1, an auxiliary winding 3, a first drive capacitor 4 that is energized while the electric motor 1 is energized, a second drive capacitor 6 which is energized only during the high torsion operation, and is separated by a reel 5 during the low torsion operation , an ignition capacitor 7 and, a PCT thermistor 8 which is an ignition relay to turn off the ignition capacitor 7 immediately after the engine is turned on. The electromagnetic noise is explained below when an open slot rotor is used. FIG. 12 or a closed slot rotor of FIG. 11 in the single-phase induction motor of FIG. 1. FIG. 2 is a diagram showing the experimental result during a high torsion operation (i.e., relay 5 is turned on and the first drive capacitor 4 and second capacitor 6 are energized) and a low torsion operation (i.e. row 5 goes off and only the first drive capacitor 4 is energized. The electromagnetic noise generated by the open slot rotor is less than the noise generated by the closed slot rotor during a low torsion operation and also during a high torsion operation. For electromagnetic noise during high-torque operation, the difference is remarkably large. FIG. 3 and FIG. 4 are diagrams showing the noise level in the case of using the rotors 9 having a width different from the slot opening 12a, respectively. As shown in FIG. 4 when the width of the slot opening is 1 mm or more, g the electromagnetic noise of the open slot rotor is less than that of the closed slot rotor at approximately 400 Hz. On the other hand, the electromagnetic noise of the open slot rotor generated by the slot harmonic is higher than that of the slotted rotor closed at approximately 1000 Hz. However, a general level of electromagnetic noise generated by the open slot rotor is less than that generated by the slot rotor closed. FIG. 3 is a diagram showing an experimental result of electromagnetic noise when the width of the slot opening 12a is 0.5 mm. The level of electromagnetic noise generated by the open slot rotor is smaller than that of the closed slot rotor over full frequencies, especially the difference in level between the closed slot rotor and the open slot rotor is large, around 40Hz. The present invention relates mainly to electromagnetic noise around 400 Hz, which generally belongs to a low frequency tone. Since this low frequency tone is, for example, emitted from the surface of the compressor and infiltrated from the refrigerator frame, it is very difficult to cut the noise perfectly. Therefore, the most effective way to avoid noise emission and noise infiltration is to reduce the level of the sound source. According to the first embodiment, when a driving load is high, the capacitance is increased to obtain a high torsion and, when a driving load is low, the capacitance is decreased to obtain a low torsion. Consequently, the motor operates very efficiently du a low impulse load and, as a whole, results in a highly efficient operation. In addition, the rotor core includes the slot openings 12a which have no bridges 14 between each slot 12 and the rotor circumference 9a to join each tooth 13. Therefore, it is possible to avoid magnetic saturation and suppress noise generation electromagnetic even du the operation of high load and high torque. As a result, a low noise single phase induction motor can be obtained.
Mode 2. A second embodiment of the present invention is described by reference to the drawings. FIG. 5 is a method for pressfitting a rotor core assembly into a hub in a rotor assembly method according to the second embodiment. FIG. 6 is a cross-sectional view of a die-cast assembly. FIG. 7 is a diagram showing a state of separation of the rotor core assembly from the bushing. In FIG. 5-FIG. 7, the figures comprise a rotor core assembly 15, which is laminated by punched steel plates of the open slot rotor shape, a bushing within which the rotor core assembly 15 is inserted into the die-casting , a concave portion 16a is formed on the periphery of the hub 16, a removable assembly 17, a fixed assembly 18, a core band 19 which is coupled with the hub 16 leaving a clearance between its surfaces and, a convex portion 19a that is intertrawed with the concave portion 16a of the core bushing 16. FIG. 8 is a flow diagram showing how to manufacture the rotor assembly. In step 30, a core assembly is inserted into the hub 16. In step 31, the removable assembly 17 and the fixed assembly 18 closely contact the respective edges of the core assembly. In step 32, a load is applied to the removable assembly 17 to fix the location of the rotor. After the die-casting in step 33, only the rotor is separated in step 34. In the drawing, the convex portion of the core band 19 is coupled to the concave portion of the bushing 16, leaving a gap between them. . Since the convex portion exactly interfered with the concave portion, the hub 16 never slides off the core band 19, if the frictional force acts on the hub 16 in the directions of the shaft, when the core assembly 15 is inserted or separated. The same effects result if the core band 19 has a convex portion and the hub has a concave portion on its periphery. By making a narrower gap between the core assembly 15 and the bushing 16, the aluminum can be prevented from moving out of the gap between the core assembly 15 and the bushing 16 during die casting. Accordingly, the core assembly 15 can be easily separated after die casting. This also eliminates the need for cutting or smoothing the circumference of the rotor 9a after die-casting, since the exit of the aluminum between the core assembly and the bushing 16 can be prevented, even if the open-slot rotor is used. As a result, the cost required to manufacture the open slot rotor can be significantly reduced. Further, since the bushing 16 is fixed to the die-casting machine together with the core band 19, this stabilizes the precision of the snap fit. Furthermore, since only the rotor 9 is separated, this facilitates mass production as well as automation.
Mode 3. A third embodiment of the invention is described by reference to the drawings. FIG. 9 is a cross-sectional view showing an assembly structure by the oil pressure mandrel system according to the rotor assembly method of the third embodiment of the invention. FIG.
is a flow chart showing the procedure of assembling a rotor. According to the manufacturing method of the third embodiment, the core assembly 15 is inserted into the oil pressure mandrel 20 in the core band 19 (step 40). The removable assembly 17 and the fixed assembly 18 closely contact the respective edges of the core assembly 15 and then raise the oil pressure in the oil pressure mandrel 20 (step 41) which narrows the clearance between the core assembly 15 and oil pressure mandrel 20 (step 42). After, the aluminum is die-cast (stage 43). Then the oil pressure in the oil pressure chuck 20 (step 44) is reduced. Subsequently, only the rotor is separated (step 45), which prevents the aluminum from coming out of the slot openings 12a of the circumference portion. The inner diameter of the oil pressure mandrel 20 is finely controlled by changing all the pressures, which is possible to zero the free space between the assembly core and 15 and the oil pressure chuck 20. For another Since the free space 20 is large before raising the oil pressure, the assembly core 15 can easily be fixed in the oil pressure chuck 20. Furthermore, in the present embodiment, the exit of the aluminum from the between the core assembly 15 and the pressure mandrel 20 during die casting and, therefore, the core assembly 15 can be easily assembled by lowering the oil pressure after die casting. As described above, this eliminates the need to cut or smooth the circumference of the rotor 9 after die-casting and, therefore, can manufacture an open-slot rotor effective in cost as compared to a conventional method that requires cut or straightened. In addition, since the core assembly 15 is fixed very easily, it is possible to reduce both the time and the cost of manufacturing. In addition, the method of the third embodiment is preferable in the duration of assembly compared to the procedure in which the hub 16 is engaged, since no portion is worn.
Claims (3)
1. A single-phase induction motor comprising: a main winding; an auxiliary winding that is positioned so that the electrical angle of the auxiliary winding is different from that of the main winding; a plurality of drive capacitors connected to the auxiliary winding; a relay to control the on / off of the driving capacitors in response to a driving load; and a rotor having openings in the open side (circumference side) of the grooves.
2. A rotor assembly apparatus comprising: a bushing into which the rotor core assembly for die casting is inserted, wherein a clearance between the bushing and the core assembly is narrower to the extent that the core assembly can be separated after die-casting; and a core band having a clearance between the core band and the hub in the circumferential direction of said hub, the core band being engaged within the hub such that movement in the direction of the shaft is restricted.
3. A rotor assembly apparatus comprising: an oil pressure mandrel into which the rotor core assembly for die casting is inserted, wherein the clearance between the rotor core assembly and the mandrel of oil pressure is greater during the insertion of the core assembly by decreasing the oil pressure and, said free space is narrower during die casting by increasing the oil pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07283470A JP3132992B2 (en) | 1995-10-31 | 1995-10-31 | Rotor assembly equipment |
| JP7-283470 | 1995-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MXPA96005238A true MXPA96005238A (en) | 1997-06-01 |
| MX9605238A MX9605238A (en) | 1997-06-28 |
Family
ID=17665970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MX9605238A MX9605238A (en) | 1995-10-31 | 1996-10-30 | Monophase induction motor and rotor assembling apparatus. |
Country Status (11)
| Country | Link |
|---|---|
| US (2) | US5861697A (en) |
| EP (1) | EP0772277B1 (en) |
| JP (1) | JP3132992B2 (en) |
| KR (1) | KR100268320B1 (en) |
| CN (2) | CN1084954C (en) |
| BR (1) | BR9605382A (en) |
| DE (1) | DE69607103T2 (en) |
| ES (1) | ES2144703T3 (en) |
| MX (1) | MX9605238A (en) |
| SG (2) | SG77241A1 (en) |
| TW (1) | TW409450B (en) |
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| US8080380B2 (en) * | 1999-05-21 | 2011-12-20 | Illumina, Inc. | Use of microfluidic systems in the detection of target analytes using microsphere arrays |
| US8481268B2 (en) | 1999-05-21 | 2013-07-09 | Illumina, Inc. | Use of microfluidic systems in the detection of target analytes using microsphere arrays |
| KR100379473B1 (en) * | 2000-08-16 | 2003-04-10 | 엘지전자 주식회사 | Pole change motor |
| US6888279B2 (en) * | 2000-09-06 | 2005-05-03 | Lambert Haner | Controlled reluctance AC induction motor |
| US6639338B1 (en) * | 2000-09-06 | 2003-10-28 | Lambert Haner | Controlled reluctance AC induction motor |
| US7030531B2 (en) * | 2000-09-06 | 2006-04-18 | Lambert Haner | Controlled reluctance AC induction motor |
| US6870295B2 (en) * | 2001-01-22 | 2005-03-22 | Lg Electronics Inc. | Oscillating motor and motor control apparatus and method |
| US6566841B2 (en) * | 2001-02-08 | 2003-05-20 | Scroll Technologies | Scroll compressor having multiple motor performance characteristics |
| CH695976A5 (en) * | 2002-12-02 | 2006-10-31 | Roland Weigel | Apparatus and method for reducing the power consumption during start-up of a single-phase AC induction motor. |
| KR100823920B1 (en) * | 2003-07-23 | 2008-04-22 | 엘지전자 주식회사 | Driving circuit and method for hybrid induction motor |
| KR100575688B1 (en) * | 2004-08-30 | 2006-05-03 | 엘지전자 주식회사 | Driving control apparatus for capacity variable type reciprocating compressor |
| KR100593542B1 (en) * | 2004-07-08 | 2006-06-28 | 엘지전자 주식회사 | Drive of Capacitor Driven Hybrid Induction Motor |
| KR100656673B1 (en) * | 2004-07-08 | 2006-12-11 | 엘지전자 주식회사 | Apparatus for driving shading coil type Hybrid Induction Motor |
| KR100588718B1 (en) * | 2004-08-30 | 2006-06-12 | 엘지전자 주식회사 | Linear compressor |
| KR20060055046A (en) | 2004-11-17 | 2006-05-23 | 삼성전자주식회사 | Single-phase induction motor and noise reduction method thereof |
| KR100652590B1 (en) * | 2004-12-10 | 2006-12-01 | 엘지전자 주식회사 | Motor driving apparatus and method for reciprocating compressor |
| KR100619766B1 (en) * | 2005-01-07 | 2006-09-11 | 엘지전자 주식회사 | Driving control apparatus amd method for capacity variableness type reciprocating compressor |
| KR100756719B1 (en) * | 2006-02-02 | 2007-09-07 | 엘지전자 주식회사 | Control apparatus for linear compressor |
| CN101900105A (en) * | 2006-02-02 | 2010-12-01 | Lg电子株式会社 | Control apparatus for linear compressor |
| KR100819617B1 (en) * | 2006-12-29 | 2008-04-04 | 캐리어 주식회사 | Airconditioner compressor with softstarter |
| US8466597B2 (en) * | 2007-12-27 | 2013-06-18 | Mitsubishi Electric Corporation | Induction motor rotor core having shaped slots |
| US8319388B2 (en) * | 2008-01-25 | 2012-11-27 | Mitsubishi Electric Corporation | Induction motor and hermetic compressor |
| CN102099987B (en) * | 2008-08-05 | 2014-06-11 | 三菱电机株式会社 | Induction motor and enclosed compressor |
| JP5230574B2 (en) * | 2009-10-09 | 2013-07-10 | 三菱電機株式会社 | Electric motor for compressor, compressor and refrigeration cycle apparatus |
| CN103047734B (en) * | 2011-10-17 | 2016-12-28 | 美的集团股份有限公司 | A kind of air-conditioner control method of linear adjustable indoor wind speed round |
| WO2013073141A1 (en) * | 2011-11-16 | 2013-05-23 | パナソニック株式会社 | Axial blower and electric appliance equipped with same |
| CN104135090B (en) * | 2013-04-30 | 2017-01-18 | 财团法人工业技术研究院 | Mover and stator mechanism of motor |
| CN105371544A (en) * | 2014-08-29 | 2016-03-02 | 青岛海尔洗衣机有限公司 | Heat pump system, control method of heat pump system and clothes dryer |
| US9800188B2 (en) * | 2015-09-15 | 2017-10-24 | Regal Beloit America, Inc. | Hybrid drive circuit for variable speed induction motor |
| US11131491B1 (en) | 2020-08-07 | 2021-09-28 | Emerson Climate Technologies, Inc. | Systems and methods for multi-stage operation of a compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5886847A (en) * | 1981-11-17 | 1983-05-24 | Toshiba Corp | Manufacture of casted cage rotor |
| JPS58172015A (en) * | 1982-04-01 | 1983-10-08 | Nec Ic Microcomput Syst Ltd | Generating circuit of saw-tooth wave |
| JPS6039352A (en) * | 1983-08-12 | 1985-03-01 | Hitachi Ltd | Core for small-sized capacitor induction motor |
| JPS60167656A (en) * | 1984-02-06 | 1985-08-31 | Sanyo Electric Co Ltd | Manufacture of rotor |
| US4772814A (en) * | 1986-04-25 | 1988-09-20 | Lewus Alexander J | Parallel resonant single phase motor |
| JPS6355798A (en) * | 1986-08-27 | 1988-03-10 | Nec Corp | Refreshing circuit for dynamic ram |
| US4794288A (en) * | 1988-01-15 | 1988-12-27 | Lewus Alexander J | Series resonant capacitor motor |
| JPH027391A (en) * | 1988-06-25 | 1990-01-11 | Matsushita Electric Works Ltd | Dimming device |
| JPH02211042A (en) * | 1989-02-07 | 1990-08-22 | Matsushita Electric Ind Co Ltd | Manufacturing of rotor of motor |
| US5212435A (en) * | 1992-05-22 | 1993-05-18 | Morrill Motors Inc. | Variable speed asynchronous induction motor |
| JPH06225505A (en) * | 1993-01-22 | 1994-08-12 | Fanuc Ltd | Manufacture of die-cast cage rotor for induction motor |
| US5687471A (en) * | 1994-06-14 | 1997-11-18 | Honda Giken Kogyo Kabushiki Kaisha | Method of and apparatus for covering rotor magnets |
| JP3700034B2 (en) * | 1995-07-11 | 2005-09-28 | 富士電機リテイルシステムズ株式会社 | Vending machine coin handling equipment |
-
1995
- 1995-10-31 JP JP07283470A patent/JP3132992B2/en not_active Expired - Lifetime
-
1996
- 1996-10-28 US US08/738,913 patent/US5861697A/en not_active Expired - Fee Related
- 1996-10-29 TW TW085113207A patent/TW409450B/en not_active IP Right Cessation
- 1996-10-30 ES ES96307876T patent/ES2144703T3/en not_active Expired - Lifetime
- 1996-10-30 MX MX9605238A patent/MX9605238A/en not_active IP Right Cessation
- 1996-10-30 SG SG1999002626A patent/SG77241A1/en unknown
- 1996-10-30 DE DE69607103T patent/DE69607103T2/en not_active Expired - Fee Related
- 1996-10-30 SG SG1996010988A patent/SG48484A1/en unknown
- 1996-10-30 EP EP96307876A patent/EP0772277B1/en not_active Expired - Lifetime
- 1996-10-31 CN CN96121635A patent/CN1084954C/en not_active Expired - Fee Related
- 1996-10-31 BR BR9605382A patent/BR9605382A/en not_active Application Discontinuation
- 1996-10-31 KR KR1019960052197A patent/KR100268320B1/en not_active IP Right Cessation
-
1998
- 1998-02-20 US US09/026,921 patent/US5898250A/en not_active Expired - Fee Related
-
2001
- 2001-08-22 CN CN01126001A patent/CN1362776A/en active Pending
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