CN101074670A - Oilless roots vacuum pump with mechanical seal - Google Patents
Oilless roots vacuum pump with mechanical seal Download PDFInfo
- Publication number
- CN101074670A CN101074670A CN 200710024595 CN200710024595A CN101074670A CN 101074670 A CN101074670 A CN 101074670A CN 200710024595 CN200710024595 CN 200710024595 CN 200710024595 A CN200710024595 A CN 200710024595A CN 101074670 A CN101074670 A CN 101074670A
- Authority
- CN
- China
- Prior art keywords
- seal ring
- cover
- rear end
- ring
- main shaft
- 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.)
- Granted
Links
Images
Landscapes
- Mechanical Sealing (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention relates to a mechanism sealing non-oil Roots vacuum pump including the pump body, the main axis, the back end cover, the back cover, the front end cover, the front cover and electric engine. Several sidestep holes are set in the center of the back end cover and the front end cover. Between the back end cover and front end cover of the main axis is sealed by the mechanism sealing I which includes the sealing ring, the O shape sealing loop II, the washer, the inner bush, the static sealing ring supporting seat (4.1), the static sealing ring supporting seat (4.4), the auto compensation spring, the static sealing ring and the O shape sealing loop I. In the invention, the friction factor between sides is small and the sealing ring has the auto compensation function. So the using life is longer than the traditional structure and not leak oil and gas. It is designed by three vents to convenience for user.
Description
Technical field
The present invention relates to a kind of vacuum pump, especially relate to a kind of oilless roots vacuum pump with mechanical seal.
Background technique
Roots pump was invented by German engineer Roots in nineteen forty-four, and its effect is the purpose that the air in seal container or the closed system or other gas can be extracted and reaches certain vacuum.Only the application on traditional industry such as chemical industry, electric power, metallurgy was more universal for Roots pump in the past.Along with the fast development of modern industry, Roots pump also begins to be used in a large number on the new process of industries such as food, pharmacy, microelectronic, light industry.
Nearly all pharmaceutical factory, the health products raw material manufacturing enterprise in the whole world all using Roots pump or Roots Vacuum Pump Units at present.Because the Roots pump running speed is very high, must be equipped with a lubricating oil tank at the two ends of pump, make each transmission part of Roots pump that enough lubricated and coolings be arranged when running up.And the pumping chamber of Roots pump is not allow oil, otherwise can cause oil pollution to being taken out medium.And in fact in the pumping chamber of annual hundreds thousand of the Roots pumps of producing in the whole world oil is arranged all at present, well imagine that our employed medicine, health products, cosmetics etc. also can be subjected to the pollution of oil unavoidably, well imagine the harm of human body.Up to the present oilless roots vacuum pump does not also have this series products in the world in the real pumping chamber.
Existing Roots pump mainly is made up of component such as the pump housing, forward and backward end cap, impeller, dynamic seal, motors.The tradition old product mainly has the following disadvantages:
1, the motive sealing problem of main shaft external part.Traditional product all adopts the sealing configuration of outside framework oil seal, the poor reliability of this sealing, and needed only about three months working life, and pump oil external leakage is serious, gas leakage is serious.
2, the motive sealing problem of the pumping chamber of two ends fuel tank and pump.Traditional product adopts maze type sealing and piston ring packing, because piston ring is an opening, sealing is very poor, and pumping fluid is easy to enter pumping chamber.
3, main shaft falls behind with the pattern that is connected of end cap.Traditional product is that cumulative error is big by the bearing support second positioning with being connected of end cap, and the product noise is bigger.
4, the pumping chamber sealing configuration of fuel tank and pump falls behind, and pumping fluid is polluted pumped gas.Pumped gas also can pollute oil.
Summary of the invention
First purpose of the present invention is to overcome above-mentioned deficiency, and the oilless roots vacuum pump with mechanical seal of the no oil that a kind of sealing reliability is good, the product noise is little is provided.
The object of the present invention is achieved like this: a kind of oilless roots vacuum pump with mechanical seal, comprise the pump housing, main shaft, rear end cover, bonnet, front cover, protecgulum and motor, described main shaft device is in the pump housing, rear end cover is fixed in pump housing rear end, bonnet is fixed in the rear end cover rear side, rear-end of spindle is stretched out rear end cover and is placed in the rear fuel tank, front cover places pump housing front end, protecgulum places the front cover front side, the protecgulum front end seals with the axle sealed cover, front-end of spindle stretches out front cover, protecgulum and axle sealed cover and links to each other with motor output end by coupling, it is characterized in that:
What step hole described rear end cover and front cover center are provided with, the chopped-off head of rear end cover and front cover
Set bearing in the step hole;
Adopt mechanical seal I sealing between described main shaft and rear end cover and the front cover, this mechanical seal I comprises rotary packing ring, O RunddichtringO II, packing ring, neck bush, stationary seal ring bearing, static seal ring seat, stationary seal ring, automatic counterbalance spring and O RunddichtringO I, described packing ring, rotary packing ring and neck bush are placed on the main shaft of bearing side successively, and O RunddichtringO II is embedded in the step hole of rotary packing ring; Described stationary seal ring bearing is embedded in the intergrade step hole of rear end cover or front cover, the static seal ring seat axially is inserted in the stationary seal ring bearing, O RunddichtringO I is embedded in the step hole of stationary seal ring bearing, automatically counterbalance spring axially is embedded in the spring eye on the stationary seal ring bearing step surface, stationary seal ring is embedded in the step hole of stationary seal ring bearing, stationary seal ring and stationary seal ring bearing are placed on the neck bush, and stationary seal ring places the rotary packing ring side.
Adopt mechanical seal II sealing between described main shaft external part and the axle sealed cover, this mechanical seal II comprises motive sealing ring seat, rotary packing ring, O RunddichtringO, automatic counterbalance spring, stationary seal ring and seal ring, described motive sealing ring seat is fixedly connected on the main shaft external part with Cock screw, rotary packing ring is inserted in the step hole of seal ring seat front end, the O RunddichtringO is embedded in the step hole of rotary packing ring, automatically counterbalance spring axially is embedded in the spring eye on the rotary packing ring seat stand terrace, and O RunddichtringO and rotary packing ring are placed on the main shaft external part; Described seal ring is embedded in the step hole of sealed cover rear end, and stationary seal ring is embedded in the step hole of seal ring rear end, and stationary seal ring places the rotary packing ring side.
The present invention has following advantage:
1, adopts the balanced mechanical seal structure between main shaft and rear end cover or the front cover and between main shaft external part and the axle sealed cover, face front cover friction factor is little, seal ring has automatic compensation function, product is longer than conventional construction working life, leakage of oil, gas leak phenomenon can't occur.
2, the bearings at both ends of main shaft is directly installed on the forward and backward two end cap of the pump housing, and Location accuracy is good, easy for installation, and the product noise is low.
Description of drawings
Fig. 1 is the vertical section structure schematic representation of oilless roots vacuum pump with mechanical seal of the present invention.
Fig. 2 is the A-A cut-away view of Fig. 1.
Fig. 3 is the I enlarged view of Fig. 1.
Fig. 4 is the II enlarged view of Fig. 1.
Among the figure: the pump housing 1, rear end cover 2, bonnet 3, mechanical seal I4, rear fuel tank 5, ball bearing 6, packing ring 7, gear ring 8, tooth shell 9, oily window 10, rotor 11, main shaft 12, driven shaft 13, air inlet cover plate 14, front cover 15, protecgulum 16, bearing gland 17, preceding fuel tank 18, axle sealed cover 19, mechanical seal II20, motor link press span 21, motor 22, coupling 23, exhaust cover plate 24.
Stationary seal ring bearing 4.1, automatic counterbalance spring 4.2, O RunddichtringO I 4.3, static seal ring seat 4.4, neck bush 4.5, stationary seal ring 4.6, rotary packing ring 4.7, O RunddichtringO II4.8, packing ring 4.9, seal ring 20.1, stationary seal ring 20.2, rotary packing ring 20.3, O RunddichtringO 20.4, motive sealing ring seat 20.5, Cock screw 20.6, automatic counterbalance spring 20.7.
Embodiment
Referring to Fig. 1～2, invention is a kind of oilless roots vacuum pump with mechanical seal, mainly is made up of the pump housing 1, main shaft 12, driven shaft 13, rotor 11, ball bearing 6, rear end cover 2, bonnet 3, front cover 15, protecgulum 16, axle sealed cover 17, motor link press span 21 and motor 22.Described main shaft 12 and driven shaft 13 are installed in the pump housing 1, rotor 11 is installed in main shaft 12 and the driven shaft 13, rear end cover 2 usefulness socket head screws are fixedly connected on the pump housing 1 rear end, what step hole rear end cover 2 centers are provided with, ball bearing 6 is embedded in the chopped-off head step hole of rear end cover 2, bonnet 3 usefulness socket head screws are fixedly connected on rear end cover 2 rear sides, the seal chamber that forms between bonnet 3 and the rear end cover 2 is a rear fuel tank 5, main shaft 12 rear ends are stretched out rear end cover 2 and are placed in the rear fuel tank 5, seal with employing mechanical seal I 4 between main shaft 12 and the rear end cover 2, main shaft 12 back external parts in the rear fuel tank 5 install packing ring 7 and tooth shell 9 successively, external part end, main shaft 12 back is fixed with round nut with rectangular seal and axle, uses hex screw and spring washer fixed gear ring 8 on the tooth shell 9.Front cover 15 places the pump housing 1 front end, protecgulum 16 places front cover 15 front sides, the seal chamber that forms between protecgulum 16 and the front cover 15 is preceding fuel tank 18, motor link press span 21 usefulness hex screws are fixedly connected on protecgulum 16 front sides, motor 22 usefulness double end hex head bolts are fixedly connected on motor link press span 21 front sides, front cover 15 front ends seal with packing ring 7 and bearing gland 19, protecgulum 16 front ends seal with axle sealed cover 19, main shaft 12 front ends stretch out front cover 15, protecgulum 16 also links to each other with motor 22 output terminals by coupling 23 with axle sealed cover 19, what step hole front cover 15 centers are provided with, ball bearing 6 is embedded in the chopped-off head step hole, adopt mechanical seal I4 sealing between main shaft 12 and the front cover 15, adopt mechanical seal II20 sealing between main shaft 12 and the axle sealed cover 19, air inlet cover plate 14 usefulness O RunddichtringOs and hex screw are fixedly connected on the pump housing 1 top suction port, and exhaust cover plate 24 usefulness O RunddichtringOs and hex screw are fixedly connected on the pump housing 1 bottom and a left side, the relief opening of right side wall.
Referring to Fig. 3, the mechanical seal I4 between described main shaft and rear end cover 2 or the front cover 15 is made up of rotary packing ring 4.7, O RunddichtringO II4.8, packing ring 4.9, neck bush 4.5, stationary seal ring bearing 4.1, static seal ring seat 4.4, stationary seal ring 4.6, automatic counterbalance spring 4.2 and O RunddichtringO I4.3.Described packing ring 4.9, rotary packing ring 4.7 and neck bush 4.5 are placed on main shaft 12 external parts of ball bearing 6 sides successively, and O RunddichtringO II4.8 is embedded in the step hole of rotary packing ring 4.7;
Described stationary seal ring bearing 4.1 is embedded in the intergrade step hole of rear end cover 2 or front cover 15, static seal ring seat 4.4 axially is inserted in the stationary seal ring bearing 4.1, O RunddichtringO I4.3 is embedded in the step hole of stationary seal ring bearing 4.1, automatically counterbalance spring 4.2 axially is embedded in the spring eye on stationary seal ring bearing 4.1 step surfaces, stationary seal ring 4.6 is embedded in the step hole of stationary seal ring bearing 4.1, stationary seal ring 4.6 and stationary seal ring bearing 4.1 are placed on the neck bush 4.5, and stationary seal ring 4.6 places rotary packing ring 4.7 sides.
Referring to Fig. 4, the mechanical seal II20 between described main shaft external part and the axle sealed cover 19 mainly is made up of motive sealing ring seat 20.5, rotary packing ring 20.3, O RunddichtringO 20.4, automatic counterbalance spring 20.7, stationary seal ring 20.2 and seal ring 20.1.Described motive sealing ring seat 20.5 usefulness Cock screws 20.6 are fixedly connected on main shaft 12 external parts, rotary packing ring 20.3 is inserted in the step hole of seal ring seat 20.5 front ends, O RunddichtringO 20.4 is embedded in the step hole of rotary packing ring 20.3, automatically counterbalance spring 20.7 axially is embedded in the spring eye on motive sealing ring seat 20.5 step surfaces, and O RunddichtringO 20.4 and rotary packing ring 20.3 are placed on main shaft 12 external parts; Described seal ring 20.1 is embedded in the step hole of a sealed cover 19 rear ends, and stationary seal ring 20.2 is embedded in the step hole of seal ring 20.1 rear ends, and stationary seal ring 20.2 places rotary packing ring 20.3 sides.
Claims (2)
1, a kind of oilless roots vacuum pump with mechanical seal, comprise the pump housing (1), main shaft (12), rear end cover (2), bonnet (3), front cover (15), protecgulum (16) and motor (22), described main shaft (12) is installed in the pump housing (1), rear end cover (2) is fixed in the pump housing (1) rear end, bonnet (3) is fixed in rear end cover (2) rear side, main shaft (12) rear end is stretched out rear end cover (2) and is placed in the rear fuel tank (5), front cover (15) places the pump housing (1) front end, protecgulum (16) places front cover (15) front side, protecgulum (16) front end seals with axle sealed cover (19), main shaft (12) front end stretches out front cover (15), protecgulum (16) also links to each other with motor (22) output terminal by coupling (23) with axle sealed cover (19), it is characterized in that:
What step hole described rear end cover (2) and front cover (15) center are provided with, and set bearing (6) in the chopped-off head step hole of rear end cover (2) and front cover (15);
Adopt mechanical seal I (4) sealing between described main shaft (12) and rear end cover (2) and the front cover (15), this mechanical seal I (4) comprises rotary packing ring (4.7), O RunddichtringO II (4.8), packing ring (4.9), neck bush (4.5), stationary seal ring bearing (4.1), static seal ring seat (4.4), stationary seal ring (4.6), automatic counterbalance spring (4.2) and O RunddichtringO I (4.3), described packing ring (4.9), rotary packing ring (4.7) and neck bush (4.5) are placed on the main shaft (12) of bearing (6) side successively, and O RunddichtringO II (4.8) is embedded in the step hole of rotary packing ring (4.7); Described stationary seal ring bearing (4.1) is embedded in the intergrade step hole of rear end cover (2) or front cover (15), static seal ring seat (4.4) axially is inserted in the stationary seal ring bearing (4.1), O RunddichtringO I (4.3) is embedded in the step hole of stationary seal ring bearing (4.1), automatically counterbalance spring (4.2) axially is embedded in the spring eye on stationary seal ring bearing (4.1) step surface, stationary seal ring (4.6) is embedded in the step hole of stationary seal ring bearing (4.1), stationary seal ring (4.6) and stationary seal ring bearing (4.1) are placed on the neck bush (4.5), and stationary seal ring (4.6) places rotary packing ring (4.7) side.
2, a kind of oilless roots vacuum pump with mechanical seal according to claim 1, it is characterized in that: adopt mechanical seal II (20) sealing between described main shaft (12) external part and the axle sealed cover (19), this mechanical seal II (20) comprises motive sealing ring seat (20.5), rotary packing ring (20.3), O RunddichtringO (20.4), automatic counterbalance spring (20.7), stationary seal ring (20.2) and seal ring (20.1), described motive sealing ring seat (20.5) is fixedly connected on main shaft (12) external part with Cock screw (20.6), rotary packing ring (20.3) is inserted in the step hole of seal ring seat (20.5) front end, O RunddichtringO (20.4) is embedded in the step hole of rotary packing ring (20.3), automatically counterbalance spring (20.7) axially is embedded in the spring eye on motive sealing ring seat (20.5) step surface, and O RunddichtringO (20.4) and rotary packing ring (20.3) are placed on main shaft (12) external part; Described seal ring (20.1) is embedded in the step hole of a sealed cover (19) rear end, and stationary seal ring (20.2) is embedded in the step hole of seal ring (20.1) rear end, and stationary seal ring (20.2) places rotary packing ring (20.3) side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100245954A CN100460684C (en) | 2007-06-18 | 2007-06-18 | Oilless roots vacuum pump with mechanical seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100245954A CN100460684C (en) | 2007-06-18 | 2007-06-18 | Oilless roots vacuum pump with mechanical seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101074670A true CN101074670A (en) | 2007-11-21 |
| CN100460684C CN100460684C (en) | 2009-02-11 |
Family
ID=38975897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100245954A Expired - Fee Related CN100460684C (en) | 2007-06-18 | 2007-06-18 | Oilless roots vacuum pump with mechanical seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100460684C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979730A (en) * | 2012-10-26 | 2013-03-20 | 南通龙鹰真空泵业有限公司 | Roots pump |
| CN103075347A (en) * | 2013-01-19 | 2013-05-01 | 上海零澜机械科技有限公司 | Gap self-adaptive mixed type dual-sealing structure for roots pump drive end |
| CN103104491A (en) * | 2011-11-11 | 2013-05-15 | 中国科学院沈阳科学仪器研制中心有限公司 | Roots and claw-type rotor combined multi-stage dry vacuum pump |
| CN104019032A (en) * | 2014-03-03 | 2014-09-03 | 苏州伊莱茨流体装备有限公司 | Roots vacuum pump with self-circulating oil sealing system |
| CN104180968A (en) * | 2014-08-12 | 2014-12-03 | 中船重工特种设备有限责任公司 | Testing device for three-degree-of-freedom movements under high water pressure environment |
| CN105465340A (en) * | 2016-01-06 | 2016-04-06 | 天地上海采掘装备科技有限公司 | Lubricating system for exposed gears of aluminum mining machines |
| CN105626535A (en) * | 2016-02-29 | 2016-06-01 | 芜湖环球汽车配件有限公司 | Low-noise vacuum pump |
| CN108730175A (en) * | 2018-07-25 | 2018-11-02 | 苏州利达铸造有限公司 | A kind of alloy pump case and its processing method |
| CN111622958A (en) * | 2020-06-30 | 2020-09-04 | 温州市天成密封件制造有限公司 | Blocking liquid circulating pump |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4558870A (en) * | 1977-11-28 | 1985-12-17 | Borg-Warner Corporation | Mechanical seal assembly |
| JPS6429690A (en) * | 1987-07-22 | 1989-01-31 | Hitachi Ltd | Shaft sealing device for screw vacuum pump |
| CN1058835A (en) * | 1990-08-07 | 1992-02-19 | 丁崇光 | High-speed curved road machinery seal method and device |
| CN2483562Y (en) * | 2001-05-22 | 2002-03-27 | 祥景精机股份有限公司 | Rotary machinery shaft sealing device |
| CN2616716Y (en) * | 2003-04-28 | 2004-05-19 | 浙江新和成股份有限公司 | Improved roots pump |
| DE202004019718U1 (en) * | 2004-12-21 | 2005-03-03 | Burgmann Industries Gmbh & Co. Kg | Assembly of shaft and rotating mechanical seal, especially for refrigerant compressor, has passage for feed of flow medium provided in shaft and opens out into cavity defined by drive collar housing |
| CN201050480Y (en) * | 2007-06-18 | 2008-04-23 | 陈全玉 | Mechanical seal oil-free Root's vacuum pump |
-
2007
- 2007-06-18 CN CNB2007100245954A patent/CN100460684C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104491A (en) * | 2011-11-11 | 2013-05-15 | 中国科学院沈阳科学仪器研制中心有限公司 | Roots and claw-type rotor combined multi-stage dry vacuum pump |
| CN102979730A (en) * | 2012-10-26 | 2013-03-20 | 南通龙鹰真空泵业有限公司 | Roots pump |
| CN103075347A (en) * | 2013-01-19 | 2013-05-01 | 上海零澜机械科技有限公司 | Gap self-adaptive mixed type dual-sealing structure for roots pump drive end |
| CN104019032A (en) * | 2014-03-03 | 2014-09-03 | 苏州伊莱茨流体装备有限公司 | Roots vacuum pump with self-circulating oil sealing system |
| CN104180968A (en) * | 2014-08-12 | 2014-12-03 | 中船重工特种设备有限责任公司 | Testing device for three-degree-of-freedom movements under high water pressure environment |
| CN105465340A (en) * | 2016-01-06 | 2016-04-06 | 天地上海采掘装备科技有限公司 | Lubricating system for exposed gears of aluminum mining machines |
| CN105626535A (en) * | 2016-02-29 | 2016-06-01 | 芜湖环球汽车配件有限公司 | Low-noise vacuum pump |
| CN108730175A (en) * | 2018-07-25 | 2018-11-02 | 苏州利达铸造有限公司 | A kind of alloy pump case and its processing method |
| CN111622958A (en) * | 2020-06-30 | 2020-09-04 | 温州市天成密封件制造有限公司 | Blocking liquid circulating pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100460684C (en) | 2009-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100460684C (en) | Oilless roots vacuum pump with mechanical seal | |
| US11441564B2 (en) | Driving structure of three-axis multi-stage roots pump | |
| CN201344126Y (en) | Oil-less dry type screw vacuum pump | |
| CN201050480Y (en) | Mechanical seal oil-free Root's vacuum pump | |
| CN101046204A (en) | Scroll machine using floating seal with backer | |
| CN2797741Y (en) | Improved bearing parts | |
| CN202789381U (en) | Air compressor convenient to mount | |
| CN101074669A (en) | Roots vacuum pump with mechanical seal leakage-proof | |
| CN204677432U (en) | Full mechanical seal Roots pump | |
| CN202048016U (en) | High-efficient energy-saving vertical-type water pump | |
| CN2690629Y (en) | High temperature high pressure hot water circulation pump device | |
| CN201050481Y (en) | Mechanical seal leakage-free Root's vacuum pump | |
| CN207750485U (en) | A kind of lubrication system of decelerating motor | |
| CN1456809A (en) | Miniature balanced compressor without lubricant and vibration | |
| CN2782992Y (en) | High speed magnetic centrifugal pump | |
| CN2597707Y (en) | Full-balance vibrationless micro non-oil lubrication compressor | |
| CN208364466U (en) | Dynamic sealing device and axial flow submersible pump | |
| CN203067293U (en) | Water-lubricating single-screw oil-free air compressor | |
| CN1297111A (en) | Dry-type vacuumizing pump with cantilever and screw bolt | |
| CN2709658Y (en) | Motorcycle water pump | |
| CN220470154U (en) | Splash type lubrication gas oil-free compressor | |
| CN2299170Y (en) | Single-stage claw rotor vacuum pump | |
| CN103925217A (en) | Water-lubricating single-screw oil-free air compressor | |
| CN102536851A (en) | Centrifugal vacuum pump | |
| CN2740813Y (en) | Flange-connected three-serew pump with gear transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: JIANGYIN TIANTIAN VACUUM EQUIPMENT CO., LTD. Assignor: Chen Quanyu Contract fulfillment period: 2009.4.10 to 2014.4.10 contract change Contract record no.: 2009320000964 Denomination of invention: Oilless roots vacuum pump with mechanical seal Granted publication date: 20090211 License type: Exclusive license Record date: 2009.5.31 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.4.10 TO 2014.4.10; CHANGE OF CONTRACT Name of requester: JIANGYIN TIANTIAN VACUUM EQUIPMENT MANUFACTURING C Effective date: 20090531 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090211 Termination date: 20150618 |
|
| EXPY | Termination of patent right or utility model |