CN203682276U - Lapping-leaning static electricity guiding device of secondary seal device for floating disc in oil tank - Google Patents
Lapping-leaning static electricity guiding device of secondary seal device for floating disc in oil tank Download PDFInfo
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- CN203682276U CN203682276U CN201420031233.3U CN201420031233U CN203682276U CN 203682276 U CN203682276 U CN 203682276U CN 201420031233 U CN201420031233 U CN 201420031233U CN 203682276 U CN203682276 U CN 203682276U
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- oil tank
- tank body
- static
- plate part
- straight plate
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- 230000003068 static effect Effects 0.000 title claims abstract description 88
- 238000007667 floating Methods 0.000 title claims abstract description 47
- 230000005611 electricity Effects 0.000 title abstract 11
- 239000012790 adhesive layer Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 6
- 230000007306 turnover Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of oil product storage equipment, and particularly relates to a lapping-leaning static electricity guiding device of a secondary seal device for a floating disc in an oil tank. The oil tank comprises an oil tank body, a rubber sliding piece and a floating disc, wherein the rubber sliding piece is attached to the inner wall of the oil tank body and in an L shape, the floating disc is used for driving the rubber sliding piece to ascend or descend in the oil tank body, and the floating disc and the rubber sliding piece are fixedly installed through bolts. The lapping-leaning static electricity guiding device comprises a static electricity guiding piece and a static electricity leading-out mechanism, wherein one end of the static electricity guiding piece is connected with the inner wall of the oil tank body in an abutting-against mode, and the other end of the static electricity guiding piece is fixedly connected with the rubber sliding piece through an installing part, so that the static electricity guiding piece ascends or descends together in the oil tank body along with the rubber sliding piece. Through the design of the lapping-leaning static electricity guiding device, a good static electricity guiding effect can be provided for the secondary seal device; the lapping-leaning static electricity guiding device ascends or descends along with the rubber sliding piece in the oil tank body, so that it is ensured that the seal effect of the secondary seal device is not affected.
Description
Technical field
The utility model belongs to oil product storage equipment technical field, specifically relates to the formula that the is hooked static conducting device of floating plate secondary sealer in a kind of oil tank.
Background technology
In prior art, for reducing the volatilization of medium (as oil product) in oil tank, reduce the wastage, save the energy, protection of the environment, conventionally can in oil tank, set up floating plate.Floating plate makes it covering on oil product liquid level of with oil product liquid level lifting in oil tank lifting by buoyancy, by floating plate is installed, plays sealed storage medium, reduces medium temperature, to reach the effect of saving the energy, protection of the environment.This equipment is widely used in petrochemical complex unit in all parts of the country, each major oil companies of PetroChina Company Limited. of China Petrochemical Industry and refinery, port and pier, traffic, power plant and army rear service department.
Along with the raising of safety, environmental demands, secondary sealer, except being equipped with once sealing device, has also generally been installed in the gap between tank wall of oil tank and floating plate.Sealing arrangement should have good sealing property, prevents that oil gas from leaking, and reduces oil product loss, ensures that again the lifting of floating plate is flexible.But also there is following defect in existing floating plate secondary sealer:
1) when, oil tank turnover is oily, oil tank secondary seal is operation up and down thereupon also, in this process, between the rubber slide of secondary seal and tank skin, will there is friction, and then generation static, after static savings is too much, can produce point discharge equivalent risk, if it is breakneck that oil tank exists electric discharge phenomena, easily cause the immeasurable accidents such as fire even explodes.So, in oil tank secondary seal, static conducting device must be installed, to discharge in time fricative static, should ensure can not exist secondary seal imprecision to occur the phenomenon of oil and gas leakage after this device is installed simultaneously.
2), rubber slide is the vitals of storage tank secondary seal, directly contact with tank skin, be the critical component of realizing secondary sealing function.But, oil tank is not to be circular completely, and tank skin is not complete vertical yet, when floating plate is made in addition, be not also circular completely, will inevitably occur that thus the annular spacing between boundary plank and the tank skin of floating plate is inhomogeneous, therefore, rubber slide is not integral type, but unitary structure one by one, therefore, between adjacent monomer-type slide, will form gap, this gap makes the sealing property of secondary sealer be subject to impact to a certain extent, will cause the interior storage medium of oil tank body of floating plate bottom upwards to volatilize from this position, gap, then cause the loss of medium.
Therefore, how realizing the static producing in secondary sealer operational process is discharged rationally and effectively, and do not affect the sealing property of secondary sealer, is those skilled in the art assistant officer's problem to be solved.
Utility model content
The purpose of this utility model is to provide the formula that the is hooked static conducting device of floating plate secondary sealer in a kind of oil tank, in the time of the up-downgoing of oil tank floating plate, this is hooked formula static conducting device both can be for secondary sealer provides the good electrostatic efficiency of leading, and can ensure that secondary sealer can keep good sealing effectiveness.
For achieving the above object, the utility model has adopted following technical scheme: the formula that the is hooked static conducting device of floating plate secondary sealer in a kind of oil tank, it comprises oil tank body, be attached at the L-shaped rubber slide of oil tank body inwall and drive the floating plate of rubber slide lifting in oil tank body, floating plate is installed fixing by bolt and rubber slide, this is hooked formula static conducting device and comprises and lead static sheet for what derive oil tank body inwall static, for the static export agency that the static of leading on static sheet is discharged, this leads static sheet one end and oil tank body inwall butt, the other end is affixed by fabricated section and rubber slide, make this lead static sheet with the together lifting in oil tank body of rubber slide.
The utility model can also further be implemented by the following technical programs:
Preferably, described in, leading static sheet is linked in sequence and forms successively by curve, the first straight plate part, the second straight plate part, the 3rd straight plate part and the 4th straight plate part; Described curve is c-shaped, is resisted against oil tank body inwall, and its opening direction is to deviate from and a side of the oil tank body inwall of its butt; The tangential direction of described the first straight plate part in curve, between described the first straight plate part and the second straight plate part, there is the angle of 120～150 °, between described the second straight plate part and the 3rd straight plate part, there is the angle of 100～110 °, between described the 3rd straight plate part and the 4th straight plate part, there is the angle of 90 °.
Further, described rubber slide by be attached at oil tank body inwall riser portion, be the lateral piece of horizontal arrangement and bending part that two transition are linked into an integrated entity forms, in the riser portion of rubber slide, be also provided with the extension that stretches to lateral piece one side; The 4th straight plate part is vertically placed on the side of this lateral piece, the 3rd straight plate part is placed horizontally on the top planes of this lateral piece, spacing between the top of the second straight plate part and riser portion is less than the spacing between its bottom and riser portion, and the first straight plate part is placed in the top on riser portion top.
Further, described fabricated section comprises and is attached at the first Z-shaped fabricated section of being of lateral piece bottom surface and side, is attached at the second Z-shaped fabricated section of being of lateral piece top and side, is placed in the 3rd fabricated section on the second fabricated section top, and successively by the lateral piece of the 3rd straight plate part, the 3rd fabricated section, the second fabricated section, rubber slide and the fixing bolt of the first fabricated section; One end of the second fabricated section is placed in downside the butt with it of extension, and a side of the 3rd fabricated section is in the upside of extension butt with it.
Further, described static export agency is formed with the cable being connected with conductive plate by be arranged on the conductive plate on the 4th straight plate part top by bolt.
Further, described rubber slide is made up of some monomer-type slides of arranging in the form of a ring and be attached on oil tank body inwall, between adjacent monomer-type slide, be provided with and make both form the joint component of integral structure, make the interior storage medium of oil tank body of floating plate bottom be unlikely to upwards to volatilize from gap between the two.
Preferably, described joint component is made as adhesive layer, and described adhesive layer connects the monomer-type slide of its both sides, to clog the gap between adjacent monomer-type slide.
The formula that the is hooked static conducting device of floating plate secondary sealer in oil tank of the present utility model, its beneficial effect shows:
1), oil tank when oil turnover, secondary sealer is operation up and down thereupon also, in this process, between rubber slide and oil tank body inwall, will have friction, and then generation static.The utility model is hooked formula static conducting device by design, in order to this static is derived, its specifically comprise for derive oil tank body inwall static lead static sheet, for will lead static on the static sheet static export agency of discharging, this leads static sheet one end and oil tank body inwall butt, the other end is affixed by fabricated section and rubber slide, makes this lead static sheet with the together lifting in oil tank body of rubber slide.The utility model is by being hooked formula static conducting device, can provide the good electrostatic efficiency of leading for secondary sealer, because this is hooked formula static conducting device with the together lifting in oil tank body of rubber slide, therefore, can also ensure that the sealing effectiveness of secondary sealer is unaffected.
2), the utility model is provided with and makes both form the joint component of integral structure between adjacent monomer-type slide, make the interior storage medium of oil tank body of floating plate bottom be unlikely to upwards to volatilize from gap between the two, by the enforcement of joint component, both can effectively avoid the interior storage medium of oil tank body of floating plate bottom upwards to volatilize from gap between the two, also ensure that the sealing effectiveness of this secondary sealer was unaffected simultaneously.
3), joint component is designed to adhesive layer by the utility model, it is placed between the first slide and the second slide, and bonding with both, to clog gap between the two.Make to coordinate closely between the first slide and the second slide, between the first slide, the second slide and oil tank body inwall, be gapless formula coordinates simultaneously, therefore, can effectively avoid the interior storage medium of oil tank body of floating plate bottom upwards to volatilize from gap between the two, ensure the good sealing effectiveness of this secondary sealer simultaneously.
Brief description of the drawings
Below in conjunction with accompanying drawing, preferred implementation of the present utility model is done to further, detailed description, in accompanying drawing:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of leading static sheet 40 in Fig. 1.
Fig. 3 be in Fig. 1 A-A to cutaway view.
In figure, the implication of Reference numeral is as follows:
10-oil tank body
The 20-rubber slide 21-riser 22-of portion lateral piece
23-bending part 24-extension
201-first slide 202-the second slide
31-the 3rd fabricated section 32-the second fabricated section
33-the first fabricated section 34-bolt
40-leads static sheet 41-the 4th straight plate part 42-the 3rd straight plate part
43-second straight plate part 45-the first straight plate part 46-curve
50-static export agency 51-conductive plate 52-cable
60-adhesive layer
Detailed description of the invention
Please first consult Fig. 1, in oil tank, floating plate secondary sealer mainly comprises oil tank body 10, is attached at the L-shaped rubber slide 20 of oil tank body 10 inwalls and drives the floating plate of rubber slide 20 in oil tank body 10 interior liftings, and floating plate is installed fixing by bolt 34 and rubber slide 20.When oil tank turnover oil, secondary sealer is operation up and down thereupon also, in this process, between rubber slide 20 and oil tank body 10 inwalls, will have friction, and then produces static.
So, the utility model is hooked formula static conducting device by design, in order to this static is derived, its specifically comprise for derive oil tank body 10 inwall static lead static sheet 40, for will lead static on the static sheet 40 static export agency 50 of discharging, this leads static sheet 40 one end and oil tank body 10 inwall butts, the other end is affixed by fabricated section and rubber slide 20, makes this lead static sheet 40 with rubber slide 20 together lifting in oil tank body 10.Static export agency 50 is made up of with the cable 52 being connected with conductive plate 51 conductive plate 51, is used for deriving the static transmitting through leading static sheet 40.
The utility model is by being hooked formula static conducting device, can provide the good electrostatic efficiency of leading for secondary sealer, because this is hooked formula static conducting device with rubber slide 20 together lifting in oil tank body 10, therefore, can also ensure that the sealing effectiveness of secondary sealer is unaffected.
In order to ensure that this leads static sheet 40 and there will not be the phenomenon that departs from oil tank body 10 inwalls in During Process of Long-term Operation, the static sheet 40 of leading of the utility model design is linked in sequence and forms successively by curve 46, the first straight plate part 45, the second straight plate part 43, the 3rd straight plate part 42 and the 4th straight plate part 41.
Specifically refer to 1 and 2, curve 46 is c-shaped, is resisted against oil tank body 10 inwalls, and its opening direction is to deviate from and a side of oil tank body 10 inwalls of its butt; The tangential direction of the first straight plate part 45 in curve 46, between the first straight plate part 45 and the second straight plate part 43, there is the angle of 120～150 °, between the second straight plate part 43 and the 3rd straight plate part 42, there is the angle of 100～110 °, between the 3rd straight plate part 42 and the 4th straight plate part 41, there is the angle of 90 °.
Because oil tank is not to be circular completely while making, tank skin is not complete vertical yet, when floating plate is made in addition, be not also circular completely, will inevitably occur that thus the annular spacing between boundary plank and the tank skin of oil tank floating plate is inhomogeneous, such as some place is 200mm, some place may be 300mm, if while adding the up-downgoing of floating plate, the annular spacing of each aspect is not identical again, therefore, lead the curve 46 of static sheet 40 and can fit all the time on oil tank body 10 inwalls, will determine the electrostatic conductive performance of floating plate secondary sealer.
The utility model, just by the appropriate design of above-mentioned each angle numerical value, there will not be thereby ensured to lead static sheet 40 phenomenon that departs from oil tank body 10 inwalls in During Process of Long-term Operation.Simultaneously, leading static sheet 40 is to be made by high-hardness stainless steel material, there is very high consistency and elasticity, in the time deforming, still can return to initial condition, therefore, leading static sheet 40 can fit together all the time with oil tank body 10 inwalls, thereby reaches the good electrostatic efficiency of leading, and has eliminated the negative consequence that oil tank secondary seal exists static to bring.
In addition, can be with rubber slide 20 together lifting in oil tank body 10 in order to ensure that this leads static sheet 40, first, rubber slide 20 by be attached at oil tank body 10 inwalls riser portion 21, be the lateral piece 22 of horizontal arrangement and bending part 23 that two transition are linked into an integrated entity forms, in the riser portion 21 of rubber slide 20, be also provided with the extension 24 that stretches to lateral piece 22 1 sides.Secondly, the 4th straight plate part 41 is vertically placed on the side of this lateral piece 22, the 3rd straight plate part 42 is placed horizontally on the top planes of this lateral piece 22, spacing between the top of the second straight plate part 43 and riser portion 21 is less than the spacing between its bottom and riser portion 21, and the first straight plate part 45 is placed in the top on riser portion 21 tops.
In order to ensure that the installation of leading between static sheet 40 and rubber slide 20 coordinates, above-mentioned fabricated section comprises and is attached at the first Z-shaped fabricated section 33 of being of lateral piece 22 bottom surfaces and side, is attached at the second Z-shaped fabricated section 32 of being of lateral piece 22 tops and side, is placed in the 3rd fabricated section 31 on the second fabricated section 32 tops, and successively by lateral piece 22 and the fixing bolt 34 of the first fabricated section 33 of the 3rd straight plate part 42, the 3rd fabricated section 31, the second fabricated section 32, rubber slide 20; One end of the second fabricated section 32 is placed in downside the butt with it of extension 24, and a side of the 3rd fabricated section 31 is in the upside of extension 24 butt with it.Meanwhile, the conductive plate 51 of static export agency 50 is arranged on the top of the 4th straight plate part 41 by bolt 34.
In addition, because rubber slide 20 is made up of some monomer-type slides of arranging in the form of a ring and be attached on oil tank body 10 inwalls, therefore, between adjacent monomer-type slide, will form gap, this gap makes the interior storage medium of oil tank body 10 of floating plate bottom upwards volatilize from gap between the two, thereby causes the loss of medium.
So, as another goal of the invention of the present utility model, the utility model is provided with and makes both form the joint component of integral structure between adjacent monomer-type slide, make the interior storage medium of oil tank body 10 of floating plate bottom be unlikely to upwards to volatilize from gap between the two, by the enforcement of joint component, both can effectively avoid the interior storage medium of oil tank body 10 of floating plate bottom upwards to volatilize from gap between the two, also ensure that the sealing effectiveness of this secondary sealer was unaffected simultaneously.
Refer to Fig. 3, taking the first slide 201 and the second slide 202 as example, how introduce in detail above-mentioned joint component by clearance seal between the two.
As a kind of preferred implementation, above-mentioned joint component is designed to adhesive layer 60 by the utility model, and adhesive layer 60 is placed between the first slide 201 and the second slide 202, and bonding with both, to clog gap between the two.As seen in Figure 3, between the first slide 201 and the second slide 202, coordinate closely, between the first slide 201, the second slide 202 and oil tank body 10 inwalls, being gapless formula coordinates, therefore, by the design of adhesive layer 60 this joint components, can effectively avoid the interior storage medium of oil tank body 10 of floating plate bottom upwards to volatilize from gap between the two, ensure the good sealing effectiveness of this secondary sealer simultaneously.
Above-described embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that those of ordinary skill in the art make the technical solution of the utility model, all should fall in the definite protection domain of the utility model claims.
Claims (7)
1. the formula that the is hooked static conducting device of floating plate secondary sealer in an oil tank, it comprises oil tank body (10), be attached at the L-shaped rubber slide (20) of oil tank body (10) inwall and drive the floating plate of rubber slide (20) lifting in oil tank body (10), floating plate is installed fixing by bolt (34) and rubber slide (20), it is characterized in that: this is hooked formula static conducting device and comprises and lead static sheet (40) for what derive oil tank body (10) inwall static, the static export agency (50) of discharging for the static that will lead on static sheet (40), this leads static sheet (40) one end and oil tank body (10) inwall butt, the other end is affixed by fabricated section and rubber slide (20), make this lead static sheet (40) with rubber slide (20) together lifting in oil tank body (10).
2. the formula that the is hooked static conducting device of floating plate secondary sealer in oil tank according to claim 1, is characterized in that: described in lead static sheet (40) by curve (46), the first straight plate part (45), the second straight plate part (43), the 3rd straight plate part (42) and the 4th straight plate part (41) formation that is linked in sequence successively; Described curve (46) is c-shaped, is resisted against oil tank body (10) inwall, and its opening direction is to deviate from and a side of oil tank body (10) inwall of its butt; The tangential direction of described the first straight plate part (45) in curve (46), between described the first straight plate part (45) and the second straight plate part (43), there is the angle of 120～150 °, between described the second straight plate part (43) and the 3rd straight plate part (42), there is the angle of 100～110 °, between described the 3rd straight plate part (42) and the 4th straight plate part (41), there is the angle of 90 °.
3. the formula that the is hooked static conducting device of floating plate secondary sealer in oil tank according to claim 2, it is characterized in that: described rubber slide (20), by being attached at the riser portion (21) of oil tank body (10) inwall, bending part (23) formation that is the lateral piece (22) of horizontal arrangement and two transition are linked into an integrated entity, is also provided with the extension (24) that stretches to lateral piece (22) one sides in the riser portion (21) of rubber slide (20); The 4th straight plate part (41) is vertically placed on the side of this lateral piece (22), the 3rd straight plate part (42) is placed horizontally on the top planes of this lateral piece (22), spacing between the top of the second straight plate part (43) and riser portion (21) is less than the spacing between its bottom and riser portion (21), and the first straight plate part (45) is placed in the top on riser portion (21) top.
4. the formula that the is hooked static conducting device of floating plate secondary sealer in oil tank according to claim 3, it is characterized in that: described fabricated section comprises and is attached at Z-shaped the first fabricated section (33) of being of lateral piece (22) bottom surface and side, be attached at Z-shaped the second fabricated section (32) of being of lateral piece (22) top and side, be placed in the 3rd fabricated section (31) on the second fabricated section (32) top, and successively by the 3rd straight plate part (42), the 3rd fabricated section (31), the second fabricated section (32), the bolt (34) that the lateral piece (22) of rubber slide (20) and the first fabricated section (33) are fixing, one end of the second fabricated section (32) is placed in downside the butt with it of extension (24), and a side of the 3rd fabricated section (31) is in the upside of extension (24) butt with it.
5. the formula that the is hooked static conducting device of floating plate secondary sealer in oil tank according to claim 4, is characterized in that: described static export agency (50) is formed with the cable (52) being connected with conductive plate (51) by be arranged on the conductive plate (51) on the 4th straight plate part (41) top by bolt (34).
6. according to the formula that the is hooked static conducting device of floating plate secondary sealer in the oil tank described in claim 1～5 any one, it is characterized in that: described rubber slide (20) is made up of some monomer-type slides of arranging in the form of a ring and be attached on oil tank body (10) inwall, between adjacent monomer-type slide, be provided with and make both form the joint component of integral structure, make the interior storage medium of oil tank body (10) of floating plate bottom be unlikely to upwards to volatilize from gap between the two.
7. the formula that the is hooked static conducting device of floating plate secondary sealer in oil tank according to claim 6, it is characterized in that: described joint component is made as adhesive layer (60), described adhesive layer (60) connects the monomer-type slide of its both sides, to clog the gap between adjacent monomer-type slide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420031233.3U CN203682276U (en) | 2014-01-17 | 2014-01-17 | Lapping-leaning static electricity guiding device of secondary seal device for floating disc in oil tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420031233.3U CN203682276U (en) | 2014-01-17 | 2014-01-17 | Lapping-leaning static electricity guiding device of secondary seal device for floating disc in oil tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203682276U true CN203682276U (en) | 2014-07-02 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420031233.3U Expired - Lifetime CN203682276U (en) | 2014-01-17 | 2014-01-17 | Lapping-leaning static electricity guiding device of secondary seal device for floating disc in oil tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203682276U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326181A (en) * | 2014-10-22 | 2015-02-04 | 中国石油化工股份有限公司 | Floating roof storage tank charge transfer device |
| CN108190267A (en) * | 2018-02-09 | 2018-06-22 | 上海聪浮环保科技有限公司 | For the edge triple sealing system of External floating roof tank |
-
2014
- 2014-01-17 CN CN201420031233.3U patent/CN203682276U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326181A (en) * | 2014-10-22 | 2015-02-04 | 中国石油化工股份有限公司 | Floating roof storage tank charge transfer device |
| CN104326181B (en) * | 2014-10-22 | 2017-02-15 | 中国石油化工股份有限公司 | Floating roof storage tank charge transfer device |
| CN108190267A (en) * | 2018-02-09 | 2018-06-22 | 上海聪浮环保科技有限公司 | For the edge triple sealing system of External floating roof tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 246005 Anhui Anqing Development Zone 1.3 square kilometers development enterprise Industrial Park Patentee after: ANQING SPECIAL RUBBER & PLASTIC Co.,Ltd. Address before: 246005 Anhui Anqing Development Zone 1.3 square kilometers development enterprise Industrial Park Patentee before: ANQING SPECIAL RUBBER & PLASTIC PRODUCTS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
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| CX01 | Expiry of patent term |