CN1112281C - Percussion sport appts. - Google Patents
Percussion sport appts. Download PDFInfo
- Publication number
- CN1112281C CN1112281C CN99111184A CN99111184A CN1112281C CN 1112281 C CN1112281 C CN 1112281C CN 99111184 A CN99111184 A CN 99111184A CN 99111184 A CN99111184 A CN 99111184A CN 1112281 C CN1112281 C CN 1112281C
- Authority
- CN
- China
- Prior art keywords
- valve
- piston
- hole
- hydraulic cylinder
- cylinder
- 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.)
- Expired - Fee Related
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B1/00—Percussion drilling
- E21B1/38—Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/06—Means for driving the impulse member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/14—Control devices for the reciprocating piston
- B25D9/16—Valve arrangements therefor
- B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D2209/005—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is coaxial with the piston
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/72—Stone, rock or concrete
Abstract
The invention provides a percussion movement apparatus which comprises a valve installed between the piston and the cylinder, the upper and lower end surfaces of the valve having different cross sectional areas, and also the valve including a longitudinal piston hole with multistage sills, a plurality of holes extending to the piston hole for communicating the piston hole with exterior, and an annular projection formed on a upper portion of peripheral surface of the valve, the cylinder being mounted the outside of the valve and including a plurality of cylinder holes; and a rear cover mounted on the rear of the valve and the cylinder, the piston, the cylinder and the valve having a plurality of chambers and a valve switching chamber defined by making a difference in diameter along a longitudinal direction, and the cylinder including a cylinder block formed with a plurality of fluid passages. The apparatus of the invention can enhance percussion force and reduce the number of components and weight.
Description
Technical field
The present invention relates to a kind of hydraulic shock telecontrol equipment, it is particularly a kind of by special-shaped valve is installed between piston and hydraulic cylinder, and these Hydraulic Elements are mutually organically cooperated so that pistons reciprocating under the situation of high-speed impact/promotion axostylus axostyle under the big action of hydraulic force, the ballistic motion device that efficient can be brought into play by maximum.
Background technology
Usually, drilling operation is the subterranean tunnel excavation work, and quarrying and mining engineering are in order to reinforce the operation that adopts earlier in the fragility concrete casting engineering that does not carry out on firm ground.These drilling operations are divided into two types: a kind of is the rotary drilling operation, is installed in the drill bit slow-speed of revolution rotation on drilling equipment top, to hole on object; Another kind is the operation of impact/rotary drilling, does ballistic motion in high speed rotary motion, to hole on object.In a kind of operation in back, the common movement velocity of this operation is 200rpm/3000bpm, and pace is 1.5m/min, and this and air drill are similar, but these two kinds to operate in the application be very different.
Be applied to impact/the ballistic motion device of rotary drilling operation adopts oil pressure circulation line that various Hydraulic Elements are combined to form as hydraulic system.In this ballistic motion device, utilize mechanical energy is converted to the hydraulic pump generation of pressure energy and the high hydraulic coupling that circulates.
The device that this using liquid pressure produces ballistic motion must have following Hydraulic Elements, piston, hydraulic cylinder and the valve that is used for controlling the direction of the power that is derived from hydraulic oil.
In this hydraulic shock telecontrol equipment, hydraulic pump generally injects high-pressure and hydraulic oil by an oil-in to ante-chamber and back cavity.As a result, when the chamber, front and back of hydraulic cylinder is full of hydraulic oil, just set up high pressure.Based on the area difference between the chamber, front and back and the valve of switch is applied in the pressure differential of the upper and lower end face of valve and promotes, so the hydraulic cylinder back cavity can be connected with a low-pressure channel.
At this moment, terminal point on the piston arrives, simultaneously hydraulic oil by one from oilhole injection valve gate control chamber that the hydraulic cylinder lower surface extends out to promote valve.This action of valve causes the hydraulic cylinder back cavity to be communicated with the high pressure oilhole, and the low pressure oil bore closure so that piston descends, clashes into the axostylus axostyle coaxial with piston simultaneously.
For controlled valve, the valve connector must be arranged, tappet or the like.
As mentioned above, ballistic motion device of the prior art needs valve connector, tappet or the like to come controlled valve, and in order to inject hydraulic oil to the valve control chamber of valve and the back cavity of hydraulic cylinder, this device must have very complicated multisection type oilhole.
And because valve will be controlled a large amount of hydraulic oil, the size of valve is very big, and this just causes whole device size and weight also will increase.
Summary of the invention
Consider above-mentioned shortcoming, an object of the present invention is to eliminate above-mentioned shortcoming, a kind of ballistic motion device is provided, can increase impulsive force, and reduce the size/weight of number of parts and reduction/alleviator by the valve that special shape is installed between piston and hydraulic cylinder, the flow path of the hydraulic oil of control action on piston automatically is even and use normal hydraulic oil also hydraulic energy can be converted to reciprocating energy.
In order to reach this purpose, at one by the body that comprises the minimal number part that produces impulsive force, in hydraulic cylinder, move back and forth to discharge the piston of the hydraulic oil that injects by oil-in, the axostylus axostyle that links to each other with the piston outlet section, in the ballistic motion device of forming with the engine that makes axostylus axostyle rotation, this ballistic motion device has comprised the valve that is installed between piston and the hydraulic cylinder, this valve is constructed to such an extent that organically cooperate with piston in order to the ON/OFF flow path and according to predetermined motion, valve integral body is columned, its two end faces, the basal area that is upper surface and lower surface is different, and valve also comprises an axial piston hole that the multistage step is arranged, with vertical many piston hole and the extraneous holes that are communicated with of making of piston hole, be formed on the valve circumferential surface with part, the annular boss of before having and back circumferential surface, hydraulic cylinder is installed in outside the valve, and it has many cylinder ports for reciprocating motion of the pistons; And after a bonnet is installed in valve and hydraulic cylinder, piston, hydraulic cylinder and valve have many chambeies, and between interior and external peripheral surface, provide predetermined ring chamber by making the radial diameter difference vertically, thereby form the valve control chamber, liquid can be imported into therebetween, and hydraulic cylinder comprises that is shaped on many hydraulic cylinders that are used to suck/discharge the fluid passage of hydraulic oil.
Compared with prior art, the present invention has reduced the number of parts that hydraulic path is provided, simplify flow path itself, and controlled the suction/release direction of the fluid pressure that makes reciprocating motion of the pistons suitably, alleviated installation weight because of acting on hydraulic oil on the valve.
In structure of the present invention, hydraulic cylinder also has high-pressure accumulator and low pressure accumulator, and the pulsation when being used for compensating hydraulic oil quantity or preventing reciprocating motion of the pistons is to eliminate vibration pressure.
Best, has a valve control chamber through hole in many holes of valve at least, a valve low pressure through hole and a valve playback through hole, has a hydraulic cylinder low pressure through hole in many cylinder ports at least, a hydraulic cylinder playback through hole and a hydraulic cylinder high pressure through hole, and many chambeies comprise at least one ante-chamber, a back cavity and an intermediate cavity.
Like this, only under the suitably interaction in above-mentioned these holes, make flow path switch automatically by the hydraulic pressure of piston actuated, this has just saved the independent part or the element of control flow path, therefore not only reduce the size of device itself, and reduced its cost.
Like this, because independent part, for example, the valve connector or the tappet of controlled valve reach high pressure and divide the very complicated multisection type passage of adapted unnecessary, and valve needn't be too big, because the minimizing of number of parts just can reduce the weight and the cost of device.
Below by describing preferred embodiment in detail, above and other objects of the present invention are described, characteristics and advantage.
Description of drawings
Describe the preferred embodiment of ballistic motion device of the present invention with reference to the accompanying drawings in detail, in the accompanying drawing:
Fig. 1 is the front view of ballistic motion device of the present invention;
Fig. 2 is the axial sectional drawing of ballistic motion device of the present invention;
Fig. 3 is the amplification profile diagram of the valve of ballistic motion device of the present invention;
Fig. 4 is the amplification profile diagram of the hydraulic cylinder of ballistic motion device of the present invention;
Fig. 5 is the amplification profile diagram of the bonnet of ballistic motion device of the present invention;
Fig. 6 A is the sectional drawing of the amplification of critical piece of the present invention to 6C.
Preferred implementation
First characteristics of the present invention are, the high-pressure fluid path that is used for reducing piston is a small path that passes to the hydraulic cylinder back cavity.Second characteristic of the present invention are, cooperate with the organic of piston by valve, be used for that the flow path of the liquid of controlled valve directly is communicated with the valve control chamber and by controlling the multisection type path that liquid path forms, so increased kinetic energy efficient and valve ring around piston by valve.According to these characteristics of the present invention,, just can provide more light weight and more the ballistic motion device of simple structure because omitted the installing space of separate type valve.
Fig. 1 and Fig. 2 are respectively according to the front view of a ballistic motion device of the present invention and axial sectional drawing.
Label " 10 " expression be in put the part that produces impulsive force main body.Pulsation when being used for compensating hydraulic oil quantity or preventing reciprocating motion of the pistons is to eliminate the high pressure and the low pressure accumulator 40 of vibration pressure, 42 are installed in a side of main body 10, other inner body, for example, the oil-in 60 of connection hydraulic cylinder and oil-out 70 etc. are at the opposite side of main body.
High-pressure fluid imports inner from oil-in 60, convert low-pressure fluid to, discharges by oil-out 70 then.
Flushing parts 20 link to each other with main body 10, be used for compressed air is not sent to an end of making rotation or reciprocating axostylus axostyle with not leaking, and rotary part 30 links to each other with flushing parts 20, is used for torque according to predetermined gearratio increase hydraulic motor as described below, and torque is passed on the axostylus axostyle.Label " 80 ", " 100 " and " 120 " represent hydraulic motor respectively, to the axostylus axostyle of object transmission impulsive force and torque, and bonnet.
Referring to Fig. 2, main body 10 comprises high-pressure accumulator 40, low pressure accumulator 42, piston 130, valve 140 and other inner basic part.Main body 10 also has a hydraulic cylinder 12 that includes hydraulic cylinder 150.The shape and structure of hydraulic cylinder 150 can receive piston 130.Valve 140 is installed between piston 130 and the hydraulic cylinder 150.
Piston 130 organically cooperates mutually with valve 140, and the structure of hydraulic cylinder 150 and bonnet 120 makes flow path pass through the motion ON/OFF of valve 140.
In rotary part 30, upper chuck 32, lower chuck 34, driven gear 36 and driving gear 38 and axostylus axostyle 100 rotation engagements.
Power from the hydraulic motor 80 that is installed in main body 10 1 sides passes on the driving gear 38 by coupling spindle 82, and it drives driven gear 36, and the axostylus axostyle 100 as final output element is rotated.
Fig. 3 to 5 is respectively that the part according to ballistic motion device of the present invention is a valve 140, the amplification profile diagram of hydraulic cylinder 150 and bonnet 120.
Referring to Fig. 3, valve 140 integral body are essentially cylindrical, are shaped on piston hole 142, install and move for piston 130 in it, and many hole 143a are arranged, and 143b and 143c are communicated with piston hole 142 with extraneous.
Describe these holes in detail, see from the left side of Fig. 3, in valve 140, get first through hole 143a, as second through hole 143b of valve low pressure through hole with as the 3rd through hole 143c of valve playback through hole as valve control chamber through hole.
In a side of valve 140, annular boss 148 is outstanding with side face 148b behind side face 148a and the valve before the formation valve from the periphery of valve 140.Label " 141 " and " 149 " are represented valve upper surface and valve lower surface respectively.
Referring to Fig. 4, hydraulic cylinder 150 is installed in the outside of valve 140, and has cylinder port 152 to install and move back and forth for piston 130 and valve 140.See from the left side of Fig. 4, in hydraulic cylinder 150, be shaped on first and second through holes 153 and 154 as hydraulic cylinder low pressure through hole, as the 3rd through hole 155 of hydraulic cylinder playback through hole with as the 4th through hole 156 of hydraulic cylinder high pressure through hole, to be communicated with the cylinder port 152 and the external world.
The bonnet 120 that is mounted in valve 140 and hydraulic cylinder 150 rear portions that Fig. 5 shows.Mounting flange 122 with many bolts hole 123 is arranged on the bonnet 120, also have a step surface that is used for an end face assembling of valve 140.
Fig. 6 A is the amplification profile diagram of main parts size of the present invention to 6C.
Referring to Fig. 6,,, many spaces (ring chamber) have been determined in each of valve 140 and hydraulic cylinder 150 and between outer circumference surface respectively at piston 130 because each periphery has different diameters vertically.Fluid can import in these spaces.That is to say that the preceding and back periphery 132 and 134 of piston 130 all has step part, so that between each step part of piston 130 and inner peripheral surface, form ante-chamber 136 (first chamber) and back cavity 138 (second chamber) respectively.
And, valve control chamber 145 is formed between the interior and outer circumference surface of valve 140, based on piston 130 larger-diameter before periphery 132 situation about being connected with midcircumferential plane 133 than minor diameter, by the conversion of control high pressure and low-pressure state, valve 140 is moved forward or backward.Intermediate cavity 139 (the 3rd chamber) is formed between the midcircumferential plane 133 and valve 140 of piston 130.
The valve 140 that external diameter is identical with the internal diameter of hydraulic cylinder 150 comprises the lower and upper end face 141 and 149 that always has high pressure to be applied to it, the preceding periphery 148a that always has low pressure to be applied to it, produce the back periphery 148b of the power that promotes valve 140 owing to the effect of high/low pressure, first through hole 143 that always links to each other with the low pressure oilhole, with second through hole 144, this hole is communicated with low-pressure side or disconnection from it by the motion of valve 140 with back cavity 138.
The diameter at the rear portion of piston 130 is so little, so that can form back cavity 138 between the rear portion of piston 130 and valve 140.Corresponding to producing or release pressure, by the motion of valve 140, this back cavity 138 is communicated with low-pressure side or disconnects from it.
The operational circumstances according to ballistic motion device of the present invention of structure mentioned above is described to 6C below with reference to Fig. 6 A.
It shown in Fig. 6 A the initial state of ballistic motion device, at this moment, piston 130 and valve 140 are positioned at the terminal point of their descending motions, and high-pressure fluid is injected in the main body 10 by oil-in 60, and supply to the ante-chamber 136 interior (shown in Fig. 6 A left side) of piston 130 bottoms by fluid passage 12a.
The state of Fig. 6 A is the situation that ante-chamber and back cavity 136 and 138 are not in communication with the outside, but they are communicated with between mutually.In this case, because highly pressurised liquid constantly is injected in chamber 136 and 138 by oil-in 60, ante-chamber and back cavity 136 are increased to identical level with 138 pressure.
At this moment, set up following relationship between the valve upper surface 149 of the valve lower surface 141 of ante-chamber 136 1 sides and back cavity 138 1 sides: the cross-sectional area of valve lower surface 141 is greater than the cross-sectional area of valve upper surface 149.
Based on the relation of cross-sectional area relation, the pressure in ante-chamber 136 sides that acts on the valve lower surface is bigger, and valve 140 is moved to back cavity 138, and also, valve 140 rises.This state is shown in Fig. 6 B.
If valve 140 rises to a certain degree, the pressure that acts on upper surface 141 and the lower surface 149 equates that then the low pressure of Xiang Denging acts on preceding periphery 148a of valve and the back periphery 148b.
Shown in Fig. 6 B, when valve 140 when (upside) is mobile to the right, valve upper surface 149 begins to interdict the 4th hole 156 as the hydraulic cylinder of high pressure through hole.
When valve 140 is in complete propradation, because second chamber that limits by the smaller diameter end of piston, be that back cavity 138 disconnects from the 4th hole 156 as hydraulic cylinder high pressure through hole, and be communicated with the 3rd hole as hydraulic cylinder low pressure through hole, high pressure and low pressure act on respectively before the piston behind the periphery 132 and piston on the periphery 134, and make piston because this action of pressure rises.
At this moment, the hydraulic oil in the back cavity 138 is discharged among the 12b of fluid passage by the 3rd hole 155.
Shown in Fig. 6 C, if piston 130 rises to the position of the preceding periphery 132 of piston through valve lower surfaces 141, the first through hole 143a of highly pressurised liquid in the piston ante-chamber 136 by 140 on piston 130 and valve acts on behind the valve of valve control chamber 145 on the periphery 148b, impels valve 140 to descend.
Because valve 140 descends, when piston back cavity 138 is communicated with hydraulic cylinder the 4th hole 156, identical high pressure acts on the preceding and back periphery 132 and 134 of piston, but, because the cross-sectional area of back periphery 134 is greater than the cross-sectional area of preceding periphery 132, piston 130 still moves forward to the position shown in Fig. 6 C.Then, same stroke repeats said process.
According to ballistic motion device of the present invention mentioned above, valve is installed between piston and the hydraulic cylinder.Utilize hydraulic oil itself to play the effect of ballistic motion apparatus parts, valve can automatically be controlled the suction/emission path of hydraulic oil.And, for by-pass valve control, saved the different parts or the element of control flow path, for example, valve connector, tappet or the like.And because the transmission of high-pressure and hydraulic oil does not need very complicated multisection type passage, valve also needn't be controlled hydraulic oil too greatly, because the minimizing of number of parts, accident rate has reduced, and the minimizing of plant bulk/weight has also caused the cost reduction.
And, because the contraction in length of fluid passage, also because high-pressure and hydraulic oil directly is injected in valve control chamber and the piston back cavity, the pressure loss has reduced, so efficient has increased.At last, by along the axis of the piston to mounted valve on the piston periphery, device is simplified and has alleviated.
Although illustrate and described the present invention with reference to preferred embodiment, but this only is for illustrative purposes, technical staff in the industry is readily appreciated that, under the prerequisite of the spirit and scope of the present invention that do not depart from appended claims qualification of the present invention, can make variation and modification to the present invention.
Claims (3)
1. a ballistic motion device comprises the main body that includes the part that produces impulsive force at least, moves back and forth in hydraulic cylinder to discharge the piston by the highly pressurised liquid of oil-in supply, the axostylus axostyle that links to each other with the piston deferent segment, with be used for the power generation arrangement of rotary shaft, it is characterized in that
Between described piston and described hydraulic cylinder, valve has been installed, the structure of described valve can the ON/OFF flow path and is organically cooperated with described piston according to predetermined actions, described valve global shape is cylindrical substantially, two end face is that the cross-sectional area of upper surface and lower surface is different, described valve also has an axial piston hole with multisection type step, extend many be used for being communicated with piston hole and extraneous holes perpendicular to this piston hole, and valve periphery top form have before and a back annular boss of periphery, described hydraulic cylinder is installed in the outside of valve, it has many cylinder ports, uses so that reciprocating motion of the pistons; And
Behind described valve and described hydraulic cylinder, be equipped with bonnet,
Described piston, described hydraulic cylinder and described valve have many chambeies, and, for forming predetermined ring chamber within it and between outer circumference surface, form a valve control chamber by making the diameter difference vertically, can inject liquid in these chambeies, and described hydraulic cylinder comprises and is shaped on many hydraulic cylinders that are used for sucking/discharge the fluid passage of hydraulic oil.
2. according to the ballistic motion device of claim 1, wherein said valve also comprises an annular boss that is positioned on its periphery, with at least one valve control chamber through hole, be positioned at a valve low pressure through hole and valve playback through hole of a side of periphery behind the valve that the left side of boss and right annular section have big annular area.
3. according to the ballistic motion device of claim 1, the piston hole of wherein said valve also comprises first step and the second step that links to each other with valve control chamber through hole, is used for the motion of limited piston.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR30879/1998 | 1998-07-30 | ||
| KR1019980030879A KR100287943B1 (en) | 1998-07-30 | 1998-07-30 | Strike |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1247252A CN1247252A (en) | 2000-03-15 |
| CN1112281C true CN1112281C (en) | 2003-06-25 |
Family
ID=19545803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99111184A Expired - Fee Related CN1112281C (en) | 1998-07-30 | 1999-07-29 | Percussion sport appts. |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2000079579A (en) |
| KR (1) | KR100287943B1 (en) |
| CN (1) | CN1112281C (en) |
| CA (1) | CA2278036C (en) |
| DE (1) | DE19935890A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1366864A1 (en) * | 2002-05-31 | 2003-12-03 | Geismar | Portable hydraulic power operated impact apparatus, such as a spike driver or tamper tool |
| SE527921C2 (en) * | 2004-10-20 | 2006-07-11 | Atlas Copco Rock Drills Ab | percussion |
| KR100772301B1 (en) * | 2006-06-04 | 2007-11-02 | 이정호 | Easy hydaulic drifter system for tunnel |
| FI119398B (en) * | 2006-12-21 | 2008-10-31 | Sandvik Mining & Constr Oy | The impactor, |
| US8684470B2 (en) * | 2009-02-11 | 2014-04-01 | Vermeer Manufacturing Company | Drill head for a tunneling apparatus |
| CN102493761B (en) * | 2011-11-18 | 2014-04-23 | 汤建钢 | Hydraulic rock digger |
| EP2845989B1 (en) * | 2013-09-09 | 2015-11-18 | Sandvik Intellectual Property AB | Shock wave modification in percussion drilling apparatus and method |
| CN103722702B (en) * | 2013-12-27 | 2015-11-25 | 中国计量学院 | Non-return quantitative constant-pressure injection device |
| CN110984843B (en) * | 2019-12-29 | 2021-09-10 | 东台市高科技术创业园有限公司 | Hydraulic percussion drill power device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2613538B2 (en) * | 1993-05-10 | 1997-05-28 | ヤマモトロックマシン株式会社 | Rock drill |
-
1998
- 1998-07-30 KR KR1019980030879A patent/KR100287943B1/en not_active IP Right Cessation
-
1999
- 1999-07-19 CA CA002278036A patent/CA2278036C/en not_active Expired - Fee Related
- 1999-07-26 JP JP11210889A patent/JP2000079579A/en active Pending
- 1999-07-29 CN CN99111184A patent/CN1112281C/en not_active Expired - Fee Related
- 1999-07-30 DE DE19935890A patent/DE19935890A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CA2278036C (en) | 2005-11-29 |
| KR100287943B1 (en) | 2001-05-02 |
| DE19935890A1 (en) | 2000-04-20 |
| CN1247252A (en) | 2000-03-15 |
| CA2278036A1 (en) | 2000-01-30 |
| KR20000010132A (en) | 2000-02-15 |
| JP2000079579A (en) | 2000-03-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030625 Termination date: 20180729 |