CN202756284U - Mechanical seal device circulation protection control system - Google Patents
Mechanical seal device circulation protection control system Download PDFInfo
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- CN202756284U CN202756284U CN 201220407758 CN201220407758U CN202756284U CN 202756284 U CN202756284 U CN 202756284U CN 201220407758 CN201220407758 CN 201220407758 CN 201220407758 U CN201220407758 U CN 201220407758U CN 202756284 U CN202756284 U CN 202756284U
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Abstract
The utility model discloses a mechanical seal device circulation protection control system. A power fluid outlet pipeline is respectively connected with a power fluid input port and a pressure control port through a tee joint, a power fluid output port is connected with a pressure input port, a spacer fluid pressure port is connected with a spacer fluid return port, a power fluid return port is connected with a power source power fluid return pipeline, and a medium pressure port is connected with a pump conveying medium seal cavity. A pressure control port is connected with the power fluid outlet pipeline, the pressure input port is connected with a spacer fluid output port, a pressure output port is connected with a pressure taking port, and a pressure relief port is connected with the power source power fluid return pipeline. A spacer fluid outlet is connected with a spacer fluid seal cavity input port, the spacer fluid return port is respectively connected with a spacer fluid pressure port and a spacer fluid seal cavity output port through a tee joint, the pressure taking port is connected the pressure output port of a controllable one-way valve, and a fluid supplementary port is connected with a manual oil feeding pump. The mechanical seal device circulation protection control system is wide in adjusting range of pressure difference, enables pressure adjustment to be convenient, can improve seal performance of a mechanical seal, and can prolong the service life of the mechanical seal.
Description
Technical field
The utility model relates to the mechanical seal control system, relates in particular to a kind of mechanical seal recycling-guard control system.
Background technique
Along with developing rapidly of China's economy; national environmental consciousness is constantly strengthened; country also more and more payes attention to environmental protection; the medium that the rotating machinerys such as centrifugal pump are carried much all has threat to environment; the medium that does not allow to carry under most of the cases directly leaks in the external environment condition; to environment; this takes protective measure with regard to the sealing that requires the rotating machinerys such as centrifugal pump; prevent that hazardous medium from directly leaking into atmosphere, require rotating machinery employing double mechanical seal or the tandem mechanical seal structures such as centrifugal pump.Insulating liquid recycle scheme and the requirement of all having stipulated double seals or tandem mechanical seal structure at standard JB/T6629 and API Std API682, in API682, mainly contain three kinds of schemes of PLAN52, PLAN53 and PLAN54, PLAN52 is the insulating liquid recycle scheme of tandem mechanical seal structure, PLAN53 and PLAN54 are the insulating liquid recycle schemes of double seals, this two schemes requires to provide external power supply for insulating liquid, and the pressure of insulating liquid should be higher than the pressure 20-25Psi (being 0.135-0.175MPa) of main seal cavity.Plan53A: external connection power source, nitrogen normally, owing to directly adopting the nitrogen pressurization, when pressure surpasses certain value, nitrogen immerses insulating liquid and becomes the band gas-liquid, and it not only affects the thermal cycle effect, the more important thing is that band gas insulating liquid will cause dried running and make seal failure at the primary sealing area gas evolution, therefore at working pressure a restriction is arranged, require pressure medium to be lower than 2MPa.Plan53B: the bladder accumulator by other configuration provides power source; air bag has been eliminated contacting of nitrogen and insulating liquid; the insulating liquid power source is provided by bladder accumulator; if the medium-tight cavity pressure is higher; the force value of outside second protection seal isolation liquid must be set by the fluctuation peak; mechanical seal often is under the high pressure working condition to be moved; because air bag is individual independently locking system; affected by temperature etc. larger for gas in the air bag, and pressure surge is larger, and the pressure-bearing of air bag is strengthened; mechanical seal is under the high pressure working condition to be moved; the complexity of the composition of medium may produce corrosion to air bag simultaneously, makes air bag have the possibility of blast.PLAN53C: be the power source that the differential pressure cylinder of 1:1.1 offers insulating liquid by pressure difference, the large tank of differential pressure cylinder connects the medium-tight chamber, small oil tank (piston rod is arranged) connects the insulating liquid Seal cage, it is servo-actuated that the pressure of insulating liquid will be pressed the supercharging amplitude of 1:1.1 with the main seal cavity pressure medium, owing to will overcome the frictional force of large tank and small oil tank and the active force of spring, cause the Plan53C system can only be applicable to pressure〉operating mode that the 2MPa equal pressure is higher.PLAN54 is by external system, generally is the petrol station system, as power source, directly provide insulating liquid to rush liquid, the pressure of insulating liquid should be higher than the pressure 20-25Psi of main seal cavity, and system architecture is complicated, the control point is many, cost is higher, is applicable to special occasions or a plurality of pump assembly need to be concentrated the occasion of flushing, but when system breaks down, the medium of inner seal can leak into external isolation liquid system, insulating liquid is polluted, and etching system affects the operation of whole system.
The prior art Patent number is: 200720099724.1 " Intelligent oil-gas mixed flow double-screw pump mechanical seal protection systems ", 200820143842.2 " a kind of mechanical seal protection system of marine double-screw cargo oil pump for conveying bitumen " and 201220078830.2 " a kind of mechanical seal circulation protection system " belong to the PLAN54 scheme among the API682.Mainly be the Seal cage pressure P 2 of regulating and control insulating liquid by mechanisms such as measurement and control instrument and adjusting color controlss, system architecture is complicated, and the control point is many, needs measurement and control instrument, and cost is higher, is not suitable for actual use.
The chemical plant installations pump is abominable with the most running environment of mechanical seal, do not allow medium to leak to atmosphere end, need auxiliary system to be improved working environment, concerning double mechanical seal how the pressure difference Δ P between the Seal cage pressure P 2 of the Seal cage pressure P 1 of relatively accurate control fed sheet of a media end and insulating liquid end to the sealability that improves mechanical seal with increase the service life important meaning is arranged, require the Seal cage pressure P 2 of insulating liquid end greater than medium-tight cavity pressure P1, interior seal leakage will be that insulating liquid leaks in the medium of carrying, avoid the dielectric leakage of harm out, thus insulating liquid pressure determine whether be related to mechanical seal can stablize, one of key factor of reliable operation.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of mechanical seal recycling-guard control system is provided.
The power fluid outlet line by threeway respectively with controllable regulator valve on the pressure control of being connected with controllable check valve of power fluid inlet opening mouthful be connected, power fluid delivery outlet on the controllable regulator valve is connected with pressure introduction port on the controllable check valve by pipeline, insulating liquid pressure port on the controllable regulator valve is connected with insulating liquid liquid return hole on the accumulator by pipeline, power fluid liquid return hole on the controllable regulator valve is connected with power source power fluid liquid return pipe line by pipeline, and the pressure medium mouth on the controllable regulator valve is connected with pump fed sheet of a media Seal cage by pipeline; Pressure control mouth on the controllable check valve is connected with the power fluid outlet line by pipeline, pressure introduction port is connected with the insulating liquid delivery outlet of controllable regulator valve by pipeline, pressure output is connected with pressure tappings on the accumulator by pipeline, and the pressure relief opening on the controllable check valve is connected with power source power fluid liquid return pipe line by pipeline; Insulating liquid liquid outlet on the accumulator is connected with insulating liquid Seal cage entrance by pipeline, the insulating liquid liquid return hole is connected with the insulating liquid Seal cage with the insulating liquid pressure port of controllable regulator valve respectively by threeway and is connected, pressure tappings is connected with the pressure output of controllable check valve by pipeline, the fluid infusion mouth is connected with manual oil feed pump by pipeline, replenishes insulating liquid by manual oil feed pump;
Described accumulator is provided with hex head bolt, cover plate, return spring, protection cylinder, rod seal circle, end bracket enclosed circle, middle hex head bolt, outer jacket casing, piston rod, piston packing, piston, cylinder barrel seal ring, cylinder barrel, lower hex head bolt from top to bottom successively; jacket casing is provided with the insulating liquid liquid outlet outside; be provided with the insulating liquid liquid return hole at the cylinder barrel upper left side; the central position is provided with pressure tappings, is provided with the fluid infusion mouth on the right side.
Described controllable regulator valve is provided with adjusting screw, setscrew nut, adjustable lever seal ring, modulating valve valve body, adjustable lever, Regulation spring, upper seal ring, regulation valve core, lower seal, valve bonnet seal circle, modulating valve valve gap, connecting bolt from top to bottom successively.Be provided with the pressure medium mouth on modulating valve valve body upper left side top, be provided with the power fluid liquid return hole in the bottom, left side, the lower central position is provided with the insulating liquid pressure port, is provided with the power fluid delivery outlet in lower right side, is provided with the power fluid inlet opening in right upper portion.
Described controllable check valve is provided with connecting bolt, upper cover plate, upper cover plate seal ring, valve rod, one-way valve valve body, inner elements of check valve, spring, lower cover plate seal ring, lower cover plate and lower connecting bolt from top to bottom successively, be provided with pressure control mouth in controllable check valve central upper portion position, be provided with pressure introduction port in the left side, be provided with pressure output in lower right side, be provided with pressure relief opening in right upper portion.
The beneficial effect that the utility model compared with prior art has:
1) by regulating controllable regulator valve, regulate the sealing load P2 of insulating liquid end, pressure difference Δ P between the sealing load P2 of the Seal cage pressure P 1 of fed sheet of a media end and insulating liquid end is maintained within a certain range, can greatly improves the sealability of mechanical seal and increase the service life;
2) simplify the pressurizing system of double-face mechanical sealing structure, make system obtain stable pressure, avoided the present stage manually operated personal factor of whole seal protection system and the time effects of operation;
3) this system regulates pressure conveniently, and is accurate simply again;
4) the Applicable media pressure range is large, and the pressure reduction regulation range is large;
5) break down when system, controllable check valve makes the accumulator can maintenance work pressure, makes insulating liquid pressure in the accumulator greater than the medium-tight cavity pressure, prevents that dielectric leakage is in insulating liquid;
6) when power source system adopts outside petrol station system, because the buffer action petrol station system of insulating liquid directly do not contact with medium, when system breaks down or medium when occuring to leak, be not subjected to medium pollution.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described in further details.
Fig. 1 is mechanical seal recycling-guard control system structural representation;
Fig. 2 is accumulator structure schematic diagram of the present utility model;
Fig. 3 is controllable regulator valve structural representation of the present utility model;
Fig. 4 is controllable check valve structural representation of the present utility model;
Among the figure: accumulator 1; manual oil feed pump 2; controllable regulator valve 3; controllable check valve 4; upper hex head bolt 101; cover plate 102; return spring 103; protection cylinder 104; rod seal circle 105; end bracket enclosed circle 106; middle hex head bolt 107; outer jacket casing 108; piston rod 109; piston packing 110; piston 111; cylinder barrel seal ring 112; cylinder barrel 113; lower hex head bolt 114; adjusting screw 301; setscrew nut 302; adjustable lever seal ring 303; modulating valve valve body 304; adjustable lever 305; Regulation spring 306; upper seal ring 307; regulation valve core 308; lower seal 309; valve bonnet seal circle 310; modulating valve valve gap 311; connecting bolt 312; upper connecting bolt 401; upper cover plate 402; upper cover plate seal ring 403; valve rod 404; one-way valve valve body 405; inner elements of check valve 406; spring 407; lower cover plate seal ring 408; lower cover plate 409; lower connecting bolt 410; power fluid outlet P; insulating liquid liquid outlet 1a; insulating liquid liquid return hole 1b; pressure tappings 1c; fluid infusion mouth 1d; pressure medium mouth 3a; power fluid liquid return hole 3b; insulating liquid pressure port 3c; power fluid delivery outlet 3d; power fluid inlet opening 3e; pressure control mouthful 4a; pressure introduction port 4b; pressure output 4c and pressure relief opening 4d.
Embodiment
The utility model is for the problem of the pressure difference Δ P=P2-P1 between the Seal cage pressure P 1 of the Seal cage pressure P 2 that can not effectively control double mechanical seal insulating liquid end in the insulating liquid recycle scheme of existing double mechanical seal and fed sheet of a media end; provide design a kind of Seal cage pressure P 1 according to media end; control a kind of mechanical seal recycling-guard control system of two pressure difference Δ P between the Seal cage by controllable regulator valve, thereby reach the sealability that improves mechanical seal and the purpose that increases the service life.The purpose of this utility model is: for mechanical seal insulating liquid system provides a reliable and stable system and method thereof, make the pressure difference Δ P=P2-P1 between the Seal cage pressure P 1 of the Seal cage pressure P 2 of mechanical seal insulating liquid and fed sheet of a media by controlling mechanism, and adjustable in the poor scope of certain pressure, the Applicable media pressure range is large.
As shown in Figure 1, mechanical seal recycling-guard control system medium power liquid outlet P pipeline by threeway respectively with controllable regulator valve 3 on power fluid inlet opening 3e be connected with a pressure control mouthful 4a on controllable check valve is connected, power fluid delivery outlet 3d on the controllable regulator valve 3 is connected with pressure introduction port 4b on the controllable check valve 4 by pipeline, insulating liquid pressure port 3c on the controllable regulator valve 3 is connected with insulating liquid liquid return hole 1b on the accumulator 1 by pipeline, power fluid liquid return hole 3b on the controllable regulator valve 3 is connected with power source power fluid liquid return pipe line by pipeline, and the pressure medium mouth 3a on the controllable regulator valve 3 is connected with pump fed sheet of a media Seal cage by pipeline; Pressure control mouthful 4a on the controllable check valve 4 is connected with the power fluid outlet line by pipeline, pressure introduction port 4b is connected with the insulating liquid delivery outlet 3d of controllable regulator valve 3 by pipeline, pressure output 4c is connected with pressure tappings 1c on the accumulator 1 by pipeline, and the pressure relief opening 4d on the controllable check valve 3 is connected with power source power fluid liquid return pipe line by pipeline; Insulating liquid liquid outlet 1a on the accumulator 1 is connected with insulating liquid Seal cage entrance by pipeline, insulating liquid liquid return hole 1b is connected with the insulating liquid Seal cage with the insulating liquid pressure port 3c of controllable regulator valve 3 respectively by threeway and is connected, pressure tappings 1c is connected with the pressure output 4c of controllable check valve 4 by pipeline, fluid infusion mouth 1d is connected with manual oil feed pump by pipeline, replenishes insulating liquids by manual oil feed pump 2.
As shown in Figure 2, described accumulator 1 is provided with hex head bolt 101, cover plate 102, return spring 103, protection cylinder 104, rod seal circle 105, end bracket enclosed circle 106, middle hex head bolt 107, outer jacket casing 108, piston rod 109, piston packing 110, piston 111, cylinder barrel seal ring 112, cylinder barrel 113, lower hex head bolt 114 from top to bottom successively.Jacket casing is provided with insulating liquid liquid outlet 1a outside, is provided with insulating liquid liquid return hole 1b at the cylinder barrel upper left side, and the central position is provided with pressure tappings 1c, is provided with fluid infusion mouth 1d on the right side.
As shown in Figure 3, described controllable regulator valve 3 is provided with adjusting screw 301, setscrew nut 302, adjustable lever seal ring 303, modulating valve valve body 304, adjustable lever 305, Regulation spring 306, upper seal ring 307, regulation valve core 308, lower seal 309, valve bonnet seal circle 310, modulating valve valve gap 311, connecting bolt 312 from top to bottom successively.Be provided with pressure medium mouth 3a on modulating valve valve body 304 upper left side tops, be provided with power fluid liquid return hole 3b in the bottom, left side, the lower central position is provided with insulating liquid pressure port 3c, is provided with power fluid delivery outlet 3d in lower right side, is provided with power fluid inlet opening 3e in right upper portion.
As shown in Figure 4, described controllable check valve 4 is provided with connecting bolt 401, upper cover plate 402, upper cover plate seal ring 403, valve rod 404, one-way valve valve body 405, inner elements of check valve 406, spring 407, lower cover plate seal ring 408, lower cover plate 409 and lower connecting bolt 410 from top to bottom successively.Be provided with pressure control mouthful 4a in controllable check valve 4 central upper portion positions, be provided with pressure introduction port 4b in the left side, be provided with pressure output 4c in lower right side, be provided with pressure relief opening 4d in right upper portion.
Mechanical seal recycling-guard controlling method is: as the power fluid of whole system power source outlet P pipeline by threeway respectively with controllable regulator valve 3 on power fluid inlet opening 3e be connected with a pressure control mouthful 4a on controllable check valve is connected; power fluid outlet P pressure-acting is on controllable check valve 4; controllable check valve 4 work; pressure introduction port 4b on the controllable check valve 4 and pressure output 4c conducting; pressure output 4c is connected with pressure tappings 1c on the accumulator 1 by pipeline; the pressure of power fluid delivery outlet 3d on the controllable regulator valve 3 is delivered to the pressure tappings 1c on the accumulator 1; again by piston 111; make the insulating liquid that is stored in the accumulator 1 obtain pressure; insulating liquid is through the insulating liquid liquid outlet 1a on the accumulator 1; the insulating liquid pressure port 3c of insulating liquid Seal cage and insulating liquid liquid return hole 1b and controllable regulator valve 3; under the pressure-acting of insulating liquid; insulating liquid on the insulating liquid pressure port 3c promotes regulation valve core 308 and moves up; regulate the pressure of the power fluid delivery outlet 3d on the controllable regulator valve 3; make regulation valve core 308 arrive the working position; regulate the pressure of the power fluid delivery outlet 3d on the controllable regulator valve 3; make insulating liquid pressure port 3c reach stable insulating liquid pressure P 2; pressure medium mouth 3a is connected with connection mouth on the pump fed sheet of a media Seal cage by pipeline; the pressure in medium-tight chamber is P1; the difference DELTA P=P2-P1=(F-Fs) of insulating liquid pressure P 2 and medium-tight cavity pressure P1/A; wherein; A is regulation valve core 308 sectional areas; F is the active force of Regulation spring 306; Fs is frictional force; by regulating adjusting screw 301; regulate the spring force F of Regulation spring 306, realize that the difference DELTA P of insulating liquid pressure P 2 and medium-tight cavity pressure P1 is adjustable.
When power source system breaks down, power source power fluid outlet P reduces, cause controllable check valve 4 not worked, controllable check valve 4 is under insulating liquid pressure and spring 407 effects, inner elements of check valve 406 moves up, the pressure introduction port 4b on the controllable check valve 4 and not conducting of pressure output 4c, accumulator 1 maintenance work pressure P 2, make insulating liquid pressure P 2 in the accumulator 1 greater than medium-tight cavity pressure P1, prevent that dielectric leakage is in insulating liquid.
Power source system can be delivery side of pump pressure as power source, be used for the single pump operation, also can adopt outside petrol station to come as power source, generally be used for many pump operations, for many pumps provide power source.When power source system adopts outside petrol station system as power source, the petrol station system just provides power resources for the insulating liquid in the accumulator, directly do not contact with the medium that pump is carried, when mechanical seal meets accident the appearance leakage, dielectric leakage is to accumulator, because the buffer action petrol station system of insulating liquid is not subjected to medium pollution, guarantee the operation of petrol station security of system.
Claims (4)
1. mechanical seal recycling-guard control system, it is characterized in that power fluid outlet (P) pipeline by threeway respectively with controllable regulator valve (3) on power fluid inlet opening (3e) be connected 4 with controllable check valve) on pressure control mouth (4a) be connected, power fluid delivery outlet (3d) on the controllable regulator valve (3) is connected with pressure introduction port (4b) on the controllable check valve (4) by pipeline, insulating liquid pressure port (3c) on the controllable regulator valve (3) is connected with insulating liquid liquid return hole (1b) on the accumulator (1) by pipeline, power fluid liquid return hole (3b) on the controllable regulator valve (3) is connected with power source power fluid liquid return pipe line by pipeline, and the pressure medium mouth (3a) on the controllable regulator valve (3) is connected with pump fed sheet of a media Seal cage by pipeline; Pressure control mouthful (4a) on the controllable check valve (4) is connected with the power fluid outlet line by pipeline, pressure introduction port (4b) is connected with the insulating liquid delivery outlet (3d) of controllable regulator valve (3) by pipeline, pressure output (4c) is connected with pressure tappings (1c) on the accumulator (1) by pipeline, and the pressure relief opening (4d) on the controllable check valve (3) is connected with power source power fluid liquid return pipe line by pipeline; Insulating liquid liquid outlet (1a) on the accumulator (1) is connected with insulating liquid Seal cage entrance by pipeline, insulating liquid liquid return hole (1b) is connected with the insulating liquid Seal cage with the insulating liquid pressure port (3c) of controllable regulator valve (3) respectively by threeway and is connected, pressure tappings (1c) is connected with the pressure output (4c) of controllable check valve (4) by pipeline, fluid infusion mouth (1d) is connected with manual oil feed pump by pipeline, replenishes insulating liquid by manual oil feed pump (2).
2. a kind of mechanical seal recycling-guard control system as claimed in claim 1; it is characterized in that described accumulator (1) is provided with hex head bolt (101) from top to bottom successively; cover plate (102); return spring (103); protection cylinder (104); rod seal circle (105); end bracket enclosed circle (106); middle hex head bolt (107); outer jacket casing (108); piston rod (109); piston packing (110); piston (111); cylinder barrel seal ring (112); cylinder barrel (113); lower hex head bolt (114); jacket casing is provided with insulating liquid liquid outlet (1a) outside; be provided with insulating liquid liquid return hole (1b) at the cylinder barrel upper left side; the central position is provided with pressure tappings (1c), is provided with fluid infusion mouth (1d) on the right side.
3. a kind of mechanical seal recycling-guard control system as claimed in claim 1; it is characterized in that described controllable regulator valve (3) is provided with adjusting screw (301) from top to bottom successively; setscrew nut (302); adjustable lever seal ring (303); modulating valve valve body (304); adjustable lever (305); Regulation spring (306); upper seal ring (307); regulation valve core (308); lower seal (309); valve bonnet seal circle (310); modulating valve valve gap (311); connecting bolt (312); be provided with pressure medium mouth (3a) on modulating valve valve body (304) upper left side top; be provided with power fluid liquid return hole (3b) in the bottom, left side; the lower central position is provided with insulating liquid pressure port (3c); be provided with power fluid delivery outlet 3d in lower right side, be provided with power fluid inlet opening (3e) in right upper portion.
4. a kind of mechanical seal recycling-guard control system as claimed in claim 1; it is characterized in that described controllable check valve (4) is provided with connecting bolt (401) from top to bottom successively; upper cover plate (402; upper cover plate seal ring (403); valve rod (404); one-way valve valve body (405); inner elements of check valve (406); spring (407); lower cover plate seal ring (408); lower cover plate (409) and lower connecting bolt (410); be provided with pressure control mouthful (4a) in controllable check valve (4) central upper portion position; be provided with pressure introduction port (4b) in the left side; be provided with pressure output (4c) in lower right side, be provided with pressure relief opening (4d) in right upper portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220407758 CN202756284U (en) | 2012-08-17 | 2012-08-17 | Mechanical seal device circulation protection control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220407758 CN202756284U (en) | 2012-08-17 | 2012-08-17 | Mechanical seal device circulation protection control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202756284U true CN202756284U (en) | 2013-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220407758 Expired - Lifetime CN202756284U (en) | 2012-08-17 | 2012-08-17 | Mechanical seal device circulation protection control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN202756284U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797695A (en) * | 2012-08-17 | 2012-11-28 | 金庆明 | Cyclic protection control system and cyclic protection control method for mechanical seal |
-
2012
- 2012-08-17 CN CN 201220407758 patent/CN202756284U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797695A (en) * | 2012-08-17 | 2012-11-28 | 金庆明 | Cyclic protection control system and cyclic protection control method for mechanical seal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130227 Effective date of abandoning: 20141231 |
|
| RGAV | Abandon patent right to avoid regrant |