US20100147018A1 - Refrigeration apparatus - Google Patents

Refrigeration apparatus Download PDF

Info

Publication number
US20100147018A1
US20100147018A1 US12/591,856 US59185609A US2010147018A1 US 20100147018 A1 US20100147018 A1 US 20100147018A1 US 59185609 A US59185609 A US 59185609A US 2010147018 A1 US2010147018 A1 US 2010147018A1
Authority
US
United States
Prior art keywords
compressor
oil
suction pipe
compressors
discharged
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US12/591,856
Other languages
English (en)
Inventor
Satoshi Tomioka
Hideya Tamura
Tetsuya Ito
Takahiro Matsunaga
Takamitsu Kurokawa
Shintaro Sanada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu General Ltd
Original Assignee
Fujitsu General Ltd
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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Assigned to FUJITSU GENERAL LIMITED reassignment FUJITSU GENERAL LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ITO, TETSUYA, KUROKAWA, TAKAMITSU, MATSUNAGA, TAKAHIRO, SANADA, SHINTARO, TAMURA, HIDEYA, TOMIOKA, SATOSHI
Publication of US20100147018A1 publication Critical patent/US20100147018A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication

Definitions

  • the present invention relates to a refrigeration apparatus that is provided with at least two compressors, a first compressor and a second compressor, which are connected in parallel, in an outdoor unit, and is suitable for large buildings such as office buildings and apartment houses. More particularly, it relates to a technique for making the amounts of a refrigerator oil in the compressors approximately equal.
  • a so-called multiple air conditioning system has been used in which a refrigerant is supplied from one outdoor unit to a plurality of indoor units installed in the building.
  • the outdoor unit is sometimes provided in plural numbers.
  • the required air cooling capacity or heating capacity differs depending on the number of operating indoor units. Therefore, to meet this condition, a plurality of compressors are mounted in the outdoor unit.
  • the second compressor Up to a predetermined capacity, the second compressor is not operated, and only the first compressor is operated with the rotational speed thereof being controlled by an inverter. In contrast, when a capacity higher than a predetermined value is required, the second compressor of constant-speed type is operated together with the first compressor.
  • the discharged oil amount of the scroll compressor is larger, because of construction, than that of the rotary compressor.
  • a refrigerant compression section is disposed on the lower side of a motor, and the refrigerant gas generated in the refrigerant compression section passes through a passage or a gap present on the motor side and is discharged through a discharge pipe. Therefore, the refrigerant gas and the refrigerator oil are easily separated from each other.
  • the refrigerant compression section is disposed above the motor, so that even in an interior high pressure type, the refrigerant gas generated in the refrigerant compression section scarcely passes through the motor, and is discharged through a discharge pipe.
  • an object of the present invention is to provide a refrigeration apparatus in which the amounts of a refrigerator oil in compressors are made approximately equal even in the case where one compressor that is operated by being connected in parallel is a compressor in which the discharged oil amount is small and the other compressor is a compressor in which the discharged oil amount is large.
  • the present invention provides a refrigeration apparatus in which an outdoor unit includes at least two compressors, a first compressor and a second compressor, which are connected in parallel with each other; an oil separator is provided in a discharge pipe of each of the compressors; and a first oil separator on the first compressor side is connected to a suction pipe of the second compressor via first oil return piping, and a second oil separator on the second compressor side is connected to a suction pipe of the first compressor via second oil return piping, wherein the amount of discharged oil differs between the first compressor and the second compressor; and an oil storage part of the first compressor in which the amount of discharged oil is small is connected to the suction pipe of the second compressor in which the amount of discharged oil is large.
  • a rotary compressor is used as the first compressor, and a scroll compressor is used as the second compressor.
  • the outdoor unit includes at least two compressors, the first compressor and the second compressor, which are connected in parallel with each other; the oil separator is provided in a discharge pipe of each of the compressors; and the first oil separator on the first compressor side is connected to the suction pipe of the second compressor via the first oil return piping, and the second oil separator on the second compressor side is connected to the suction pipe of the first compressor via the second oil return piping, the amount of discharged oil differs between the first compressor and the second compressor; and the oil storage part of the first compressor in which the amount of discharged oil is small is connected to the suction pipe of the second compressor in which the amount of discharged oil is large.
  • a refrigerator oil is supplied from the first compressor (for example, a rotary compressor) in which the refrigerator oil is present in a relatively large amount to the second compressor (for example, a scroll compressor) in which the amount of discharged oil is large via the oil guiding pipe. Therefore, the amounts of refrigerator oil in the compressors can be made approximately equal.
  • the suction pipe of the first compressor and the suction pipe of the second compressor communicate with each other; and the connecting position of the first oil return piping and the oil guiding pipe to the suction pipe of the second compressor be a position at which the refrigerator oil supplied from the first oil return piping and the oil guiding pipe to the second compressor side drops on account of the gravity and is sucked into the first compressor when the second compressor is in a non-operating state.
  • FIG. 1 is a refrigerant circuit diagram showing a general configuration of a refrigeration apparatus in accordance with an embodiment of the present invention.
  • FIG. 2 is an enlarged view of a compressor section of an outdoor unit included in the refrigeration apparatus shown in FIG. 1 .
  • FIGS. 1 and 2 A refrigeration apparatus in accordance with an embodiment of the present invention will now be described with reference to FIGS. 1 and 2 .
  • the present invention is not limited to this embodiment.
  • this refrigeration apparatus includes an outdoor unit 100 and an indoor unit 200 .
  • the outdoor unit 100 includes a compression mechanism section 101 , a four-way valve (directional control valve) 130 , an outdoor heat exchanger 140 having an outdoor fan 141 , an outdoor expansion valve 150 , and an accumulator 160 .
  • indoor heat exchangers 210 each having an indoor expansion valve 211 are connected in parallel between liquid-side piping 11 and gas-side piping 12 .
  • Each of the indoor heat exchangers 210 is provided with an indoor fan, but the fan is omitted in the figure.
  • the compression mechanism section 101 is provided with two compressors, a first compressor 110 and a second compressor 120 that are connected to discharge-side gas piping 13 in parallel.
  • the first compressor 110 a variable-speed type rotary compressor in which the rotational speed is variable due to inverter control is used
  • the second compressor 120 a constant-speed type scroll compressor in which the rotational speed is constant is used.
  • the rotary compressor may be of a single rotor type, a usual twin rotor type, an injection system twin rotor type, or the like type.
  • a refrigerant discharge pipe 110 a of the first compressor 110 is connected to the discharge-side gas piping 13 via an oil separator 111 and a check valve 112 .
  • a refrigerant discharge pipe 120 a of the second compressor 120 is connected to the discharge-side gas piping 13 via an oil separator 121 and a check valve 122 .
  • the oil separator 111 , 121 separates a refrigerator oil contained in a high-pressure discharged gas refrigerant, and the check valve 112 , 122 inhibits the high-pressure discharged gas refrigerant sent from the other compressor from entering the own compressor.
  • the accumulator 160 is provided on the refrigerant suction side of the compressors 110 and 120 to return the refrigerant that finished its work. From the accumulator 160 , a main suction pipe 161 for a low-pressure refrigerant gas is led, and a branch pipe 162 is provided in the end part of the main suction pipe 161 .
  • the branch pipe 162 is forked into two branches. One branch is connected with a suction pipe 163 for the first compressor 110 , and the other branch is connected with a suction pipe 164 for the second compressor 120 .
  • a sub accumulator 113 is provided on the suction side of the first compressor 110 .
  • the oil separator 111 on the first compressor 110 side is connected to the suction pipe 164 for the second compressor 120 via oil return piping 114 having a capillary tube 115 serving as a pressure reducing means.
  • oil separator 121 on the second compressor 120 side is connected to the suction pipe 163 for the first compressor 110 via oil return piping 124 having a capillary tube 125 serving as a pressure reducing means.
  • an oil storage part 110 b of the first compressor (rotary compressor) 110 is connected to the suction pipe 164 of the second compressor (scroll compressor) 120 via an oil guiding pipe 116 including a capillary tube 117 serving as a pressure reducing means.
  • the connecting position of the oil return piping 114 and the oil guiding pipe 116 to the suction pipe 164 is a position at which the refrigerator oil supplied from the oil return piping 114 and the oil guiding pipe 116 to the second compressor 120 side can drop on account of the gravity.
  • the suction pipe 164 has a tilting part sloping downward toward the branch pipe 162 side, the oil return piping 114 and the oil guiding pipe 116 are connected to this tilting part.
  • the suction pipe 163 and the suction pipe 164 communicate with each other in the portion of the branch pipe 162 , when the second compressor 120 is in a non-operating state, the refrigerator oil supplied from the oil return piping 114 and the oil guiding pipe 116 to the second compressor 120 side is sucked into the first compressor 110 , and when the second compressor 120 is in an operating state, the refrigerator oil supplied from the oil return piping 114 and the oil guiding pipe 116 to the second compressor 120 side is sucked into the second compressor 120 directly.
  • the four-way valve 130 is switched over to a state indicated by solid lines in FIG. 1 .
  • the gas refrigerant discharged from the compression mechanism section 101 is brought from the four-way valve 130 to the outdoor heat exchanger 140 , being heat exchanged with the outside air, and is condensed (at the time of air cooling operation, the outdoor heat exchanger 140 acts as a condenser).
  • the liquid refrigerant condensed by the outdoor heat exchanger 140 passes through a check valve 151 connected in parallel to the outdoor expansion valve 150 , and is supplied to the indoor unit 200 .
  • the liquid refrigerant is decompressed to a predetermined pressure by the indoor expansion valve 211 , and thereafter is heat exchanged with the indoor air by the indoor heat exchanger 210 to evaporate. Thereby, the indoor air is cooled (at the time of air cooling operation, the indoor heat exchanger 210 acts as an evaporator).
  • the gas refrigerant evaporated by the indoor heat exchanger 210 goes into the accumulator 160 via the four-way valve 130 . After the liquid refrigerant has been separated, the gas refrigerant is returned to the compression mechanism section 101 .
  • the four-way valve 130 is switched over to a state indicated by chain lines in FIG. 1 .
  • the gas refrigerant discharged from the compression mechanism section 101 is brought from the four-way valve 130 to the indoor heat exchanger 210 , being heat exchanged with the indoor air, and is condensed.
  • the indoor air is warmed (at the time of air cooling operation, the indoor heat exchanger 210 acts as a condenser).
  • the liquid refrigerant condensed by the indoor heat exchanger 210 passes through the indoor expansion valve 211 the valve opening of which is controlled according to the heating capacity, and is supplied to the outdoor unit 100 .
  • the liquid refrigerant is decompressed to a predetermined pressure by the outdoor expansion valve 150 , and thereafter is heat exchanged with the outside air by the outdoor heat exchanger 140 to evaporate (at the time of heating operation, the outdoor heat exchanger 140 acts as an evaporator).
  • the gas refrigerant evaporated by the outdoor heat exchanger 140 goes into the accumulator 160 via the four-way valve 130 . After the liquid refrigerant has been separated, the gas refrigerant is returned to the compression mechanism section 101 .
  • the refrigerator oil separated by the oil separator 111 on the first compressor 110 side and the refrigerator oil in the oil storage part 110 b of the first compressor 110 are supplied to the suction pipe 164 of the second compressor 120 via the oil return piping 114 and via the oil guiding pipe 116 , respectively, and the refrigerator oil separated by the oil separator 121 on the second compressor 120 side is supplied to the suction pipe 163 of the first compressor 110 via the oil return piping 124 .
  • the amounts of refrigerator oil in the compressors 110 and 120 are made approximately equal.
  • the amount of refrigerator oil discharged together with high-pressure gas is larger in the scroll compressor than in the rotary compressor because of construction for the above-described reason. According to the present invention, however, excess refrigerator oil is supplied to the scroll compressor side of the second compressor 120 via the oil guiding pipe 116 from the rotary compressor side of the first compressor 110 to compensate the discharged oil, so that the deviation of the amounts of refrigerator oil caused by the difference in discharged oil amount between the compressors 110 and 120 can be solved.
  • first compressor inverter-controlled rotary compressor
  • second compressor constant-speed scroll compressor
  • both the two compressors may be compressors of the same compression type (for example, rotary compressors or scroll compressors).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
US12/591,856 2008-12-11 2009-12-03 Refrigeration apparatus Abandoned US20100147018A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-315651 2008-12-11
JP2008315651A JP2010139155A (ja) 2008-12-11 2008-12-11 冷凍装置

Publications (1)

Publication Number Publication Date
US20100147018A1 true US20100147018A1 (en) 2010-06-17

Family

ID=41820515

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/591,856 Abandoned US20100147018A1 (en) 2008-12-11 2009-12-03 Refrigeration apparatus

Country Status (5)

Country Link
US (1) US20100147018A1 (zh)
EP (1) EP2196747A1 (zh)
JP (1) JP2010139155A (zh)
CN (1) CN101749889A (zh)
AU (1) AU2009248463A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102954624A (zh) * 2012-11-27 2013-03-06 大连三洋压缩机有限公司 并联压缩机回油装置及控制方法
US20150219372A1 (en) * 2014-02-05 2015-08-06 Lg Electronics Inc. Heat-Pump System

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103062959A (zh) * 2012-12-29 2013-04-24 宁波奥克斯电气有限公司 双压缩机并联螺杆冷水机组油路平衡系统
CN103062948B (zh) * 2012-12-29 2015-04-08 宁波奥克斯电气有限公司 双压缩机并联螺杆冷水机组
CN104121715B (zh) * 2014-07-29 2016-06-08 浙江青风环境股份有限公司 表面处理行业专用并联共用系统涡旋满液式直冷机组
JP6334320B2 (ja) * 2014-08-22 2018-05-30 株式会社Ｎｔｔファシリティーズ 蒸気圧縮式冷凍サイクル
JP2016145651A (ja) * 2015-02-06 2016-08-12 株式会社富士通ゼネラル 空気調和装置
WO2017038131A1 (ja) * 2015-09-01 2017-03-09 株式会社デンソー 二段昇圧式冷凍サイクル
US11105537B2 (en) * 2016-10-31 2021-08-31 Mitsubishi Electric Corporation Refrigeration cycle apparatus
CN107101419A (zh) * 2017-06-20 2017-08-29 珠海格力电器股份有限公司 压缩机回油系统、回油控制方法及双压缩机系统
WO2019129113A1 (zh) * 2017-12-28 2019-07-04 艾默生环境优化技术(苏州)有限公司 用于压缩机系统的进气管道及压缩机系统
JP6970363B1 (ja) * 2020-09-30 2021-11-24 ダイキン工業株式会社 圧縮装置
CN113587353B (zh) * 2021-08-16 2022-07-08 广东积微科技有限公司 一种多联机空调系统回油的控制方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5369958A (en) * 1992-10-15 1994-12-06 Mitsubishi Denki Kabushiki Kaisha Air conditioner
US6024547A (en) * 1997-01-17 2000-02-15 Sanyo Electric Co., Ltd. Power-variable compressor and air conditioner using the same
US6287083B1 (en) * 1999-04-14 2001-09-11 Hitachi, Ltd. Compressed air production facility
US20020134094A1 (en) * 2001-03-26 2002-09-26 Deok Huh Method for controlling air conditioner having multi-compressor
US20040040323A1 (en) * 2002-09-04 2004-03-04 Atsuhiko Yokozeki Refrigerating machine
US20050081537A1 (en) * 2003-10-20 2005-04-21 Lg Electronics Inc. Apparatus for preventing liquid refrigerant accumulation of air conditioner and method thereof
US20080087028A1 (en) * 2006-10-17 2008-04-17 Lg Electronics Inc. Air conditioner

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11201566A (ja) * 1998-01-13 1999-07-30 Matsushita Refrig Co Ltd 複数圧縮機の均油システム
JP4415451B2 (ja) 2000-05-18 2010-02-17 ダイキン工業株式会社 冷凍装置
TWI237682B (en) * 2000-07-07 2005-08-11 Sanyo Electric Co Freezing apparatus
KR20020020392A (ko) * 2000-09-08 2002-03-15 주식회사 에스티씨 티이씨 고층 아파트의 수냉식 공기조화기
JP3478292B2 (ja) * 2002-05-28 2003-12-15 ダイキン工業株式会社 冷凍装置の圧縮機構
JP2005283067A (ja) * 2004-03-31 2005-10-13 Mitsubishi Heavy Ind Ltd 空気調和装置
CN1690597A (zh) * 2004-04-28 2005-11-02 乐金电子(天津)电器有限公司 具有供油管开闭功能的空气调节器的室外机
KR100846567B1 (ko) * 2004-09-02 2008-07-15 다이킨 고교 가부시키가이샤 냉동장치

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5369958A (en) * 1992-10-15 1994-12-06 Mitsubishi Denki Kabushiki Kaisha Air conditioner
US6024547A (en) * 1997-01-17 2000-02-15 Sanyo Electric Co., Ltd. Power-variable compressor and air conditioner using the same
US6287083B1 (en) * 1999-04-14 2001-09-11 Hitachi, Ltd. Compressed air production facility
US20020134094A1 (en) * 2001-03-26 2002-09-26 Deok Huh Method for controlling air conditioner having multi-compressor
US20040040323A1 (en) * 2002-09-04 2004-03-04 Atsuhiko Yokozeki Refrigerating machine
US20050086960A1 (en) * 2002-09-04 2005-04-28 Atsuhiko Yokozeki Refrigerating machine
US20050081537A1 (en) * 2003-10-20 2005-04-21 Lg Electronics Inc. Apparatus for preventing liquid refrigerant accumulation of air conditioner and method thereof
US20080087028A1 (en) * 2006-10-17 2008-04-17 Lg Electronics Inc. Air conditioner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102954624A (zh) * 2012-11-27 2013-03-06 大连三洋压缩机有限公司 并联压缩机回油装置及控制方法
US20150219372A1 (en) * 2014-02-05 2015-08-06 Lg Electronics Inc. Heat-Pump System
US10012419B2 (en) * 2014-02-05 2018-07-03 Lg Electronics Inc. Heat-pump system

Also Published As

Publication number Publication date
AU2009248463A1 (en) 2010-07-01
EP2196747A1 (en) 2010-06-16
CN101749889A (zh) 2010-06-23
JP2010139155A (ja) 2010-06-24

Similar Documents

Publication Publication Date Title
US20100147018A1 (en) Refrigeration apparatus
US8312731B2 (en) Refrigeration apparatus and method for controlling the same
US6722156B2 (en) Refrigeration system
EP2196746B1 (en) Refrigeration apparatus
US9239175B2 (en) Air conditioner and heat source unit with other unit start up control
JP5398159B2 (ja) マルチ形空気調和機の油戻し運転方法およびマルチ形空気調和機
US7578137B2 (en) Air-conditioning system with multiple indoor and outdoor units and control system therefor
US20090229300A1 (en) Refrigeration System
US7908878B2 (en) Refrigerating apparatus
US20080229769A1 (en) Subcooling Apparatus
EP1691146A1 (en) Multi-air conditioner capable of performing simultaneous cooling and heating
KR20180053853A (ko) 히트펌프 시스템
EP3431903A1 (en) Air-conditioning apparatus and method for operating the same
JP2010156485A (ja) マルチ型空気調和機
JP2005283067A (ja) 空気調和装置
JP2003314909A (ja) 冷凍装置
JP3824008B2 (ja) 過冷却装置
WO2024106478A1 (ja) 冷凍システム及びアキュムレータ
KR101622225B1 (ko) 공기조화장치
US20060123839A1 (en) Air conditioner and method for controlling the same
JP2017110820A (ja) 空気調和装置
CN116829885A (zh) 制冷循环装置
JP2013152076A (ja) マルチ型空気調和機
JP2009144957A (ja) 空気調和装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: FUJITSU GENERAL LIMITED,JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TOMIOKA, SATOSHI;TAMURA, HIDEYA;ITO, TETSUYA;AND OTHERS;SIGNING DATES FROM 20090403 TO 20090506;REEL/FRAME:023640/0557

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION