CN212064096U - Utilize radiating cell phone case of graphite alkene - Google Patents
Utilize radiating cell phone case of graphite alkene Download PDFInfo
- Publication number
- CN212064096U CN212064096U CN202021177405.XU CN202021177405U CN212064096U CN 212064096 U CN212064096 U CN 212064096U CN 202021177405 U CN202021177405 U CN 202021177405U CN 212064096 U CN212064096 U CN 212064096U
- Authority
- CN
- China
- Prior art keywords
- heat dissipation
- shell
- graphene
- hole
- fixedly connected
- 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
Links
- 229910002804 graphite Inorganic materials 0.000 title claims description 10
- 239000010439 graphite Substances 0.000 title claims description 10
- -1 graphite alkene Chemical class 0.000 title claims description 10
- 230000017525 heat dissipation Effects 0.000 claims abstract description 83
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 41
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Landscapes
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The utility model discloses a cell phone case utilizing graphene for heat dissipation, which belongs to the technical field of cell phones and comprises a shell, a charging hole, a switch key hole, a volume key hole and a camera hole, wherein the charging hole, the switch key hole and the volume key hole are respectively arranged at the bottom of the shell, the camera hole is arranged at the back of the shell, the back of the shell is also provided with a mounting hole a, the mounting hole a is positioned at one side of the camera hole, a graphene plate is fixedly arranged in the mounting hole a, and the graphene plate is positioned on the side wall inside the shell and is respectively fixedly connected with a plurality of copper pipes; utilize miniature fan as initiative heat dissipation power, it is higher than relying on the cell-phone self heat conductivity to carry out the heat dissipation passively with the tradition, temperature when can greatly reducing the cell-phone and using, improve its life, and the heat dissipation shell is located the casing back and is close to one side in camera hole, does not also influence the normal use of cell-phone under the radiating condition of assurance, but the work of automatic start miniature fan to reach energy-conserving purpose, save power consumption.
Description
Technical Field
The utility model belongs to the technical field of the cell-phone, concretely relates to utilize radiating cell phone case of graphite alkene.
Background
The mobile phones are divided into smart phones and non-smart phones, the performance of the smart phones is better than that of the non-smart phones, but the performance of the non-smart phones is stable than that of the smart phones, most of the non-smart phones and the smart phones use a CPU (central processing unit) of the English ARM company framework, the master frequency of the smart phones is higher, the running speed is high, the program processing task is faster, and the daily convenience is higher; the main frequency of the non-smart phone is low, and the running speed of the non-smart phone is low.
At present, along with the popularization of smart phones, the mobile phones become an indispensable part in the life of people, and the existing smart phones are more and more inclined to intellectualization, so that the processing running speed in the smart phones is also faster and faster, and the heat dissipation becomes a problem which is difficult to solve in the mobile phones.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize radiating cell phone case of graphite alkene to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a mobile phone shell utilizing graphene to dissipate heat comprises a shell, a charging hole, a switch key hole, a volume key hole and a camera hole, wherein the charging hole, the switch key hole and the volume key hole are respectively formed in the bottom of the shell, the camera hole is formed in the back of the shell, the mounting hole a is formed in one side of the camera hole, a graphene plate is fixedly arranged in the mounting hole a and is fixedly connected with a plurality of copper pipes on the side wall inside the shell, the part of the graphene plate outside the shell is covered in a heat dissipation shell, the heat dissipation shell is fixedly connected to the back of the shell and is integrally formed with the shell, a plurality of heat conduction plates which are arranged at equal intervals are fixedly connected to one side wall inside the heat dissipation shell, a plurality of heat dissipation fins which are sequentially arranged in a staggered manner are arranged among the plurality of heat conduction plates, fans are fixedly connected to two sides of the heat dissipation shell in an embedded manner, air outlet nets are fixedly connected to two sides of the heat dissipation shell corresponding to the micro fans, the heat dissipation shell is characterized in that an air inlet net is embedded in the upper side wall and the lower side wall outside the heat dissipation shell, and a temperature control assembly is fixedly arranged on one side wall of the graphene plate inside the shell.
The scheme is as follows:
the micro switch and the micro fan are common parts in the prior art, and the adopted models and the like can be customized according to actual use requirements.
As a preferred embodiment, one end of each of the copper tubes, which is far away from the graphene board, is connected to a heat generating device inside the mobile phone.
As a preferred embodiment, the heat dissipation shell is in an isosceles trapezoid structure, and the edge of the outer side wall of the heat dissipation shell is in an arc-edge structure.
As a preferred embodiment, the temperature control assembly comprises a sealing cylinder fixedly connected to the side wall of the graphene board inside the shell, a heat dissipation disc is fixedly arranged in the sealing cylinder, the heat dissipation disc is fixedly connected to one end of a heat conduction pipe, the other end of the heat conduction pipe penetrates through the sealing cylinder and extends to the outer side of the sealing cylinder, the heat conduction disc is fixedly connected to the side wall of the graphene board inside the shell, a piston is elastically connected to the sealing cylinder through a reset spring, a contact block is fixedly connected to the side wall of the piston away from the heat dissipation disc, a microswitch is installed at a position corresponding to the contact block in the sealing cylinder, and the microswitch is electrically connected with the micro fan.
As a preferred embodiment, the graphene plate is located on one side wall inside the housing and is fixedly connected to the heat dissipation plate through a plurality of heat conduction sheets, and the heat dissipation plate is embedded in the mounting hole b, and the mounting hole b is opened at the top of the housing.
In a preferred embodiment, metal reinforcing plates are fixedly arranged at four corners of the inner side wall of the shell.
Compared with the prior art, the utility model provides an utilize radiating cell phone case of graphite alkene includes following beneficial effect at least:
(1) the heat dissipation device has the advantages that heat is conducted on heating components inside the mobile phone through the copper pipe, heat generated by the work of the heating components is transferred to the graphene plate, and then the heat is transferred to the heat dissipation fins through the heat conduction plate on the graphene plate, on one hand, the contact area between the heat dissipation fins and air can be increased due to the fact that the heat dissipation fins are arranged in a staggered mode, heat dissipation is good, on the other hand, air can flow conveniently, the heat is taken away, the micro fan is used as active heat dissipation power, heat dissipation efficiency is higher compared with the traditional passive heat dissipation method which depends on the self heat conductivity of the mobile phone, the temperature of the mobile phone in use can be greatly reduced, the service life of the mobile phone can be prolonged, the heat dissipation shell;
(2) through temperature control assembly's effect, after heat gathering makes its temperature rise on the graphite alkene board, through the effect of heat conduction dish and heat pipe down with partial heat transfer to the heat dissipation dish on, the heat dissipation dish heat dissipation makes the inside air of sealed section of thick bamboo be heated the thermal expansion and promote the piston and remove, the piston removes and makes touch multitouch contact micro-gap switch to make micro-fan work cool down the operation, but the work of automatic start micro-fan, thereby reach energy-conserving purpose, save power consumption.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the back of the housing of the present invention;
fig. 3 is a schematic structural view of the housing of the present invention;
fig. 4 is a schematic structural view of the internal components of the heat dissipation casing of the present invention;
fig. 5 is a schematic structural diagram of a section of thick bamboo of the upper seal of the temperature control assembly of the present invention.
In the figure: 1. a housing; 2. a charging hole; 3. a switch key hole; 4. a volume key hole; 5. a camera hole; 6. a metal reinforcing sheet; 7. a mounting hole a; 8. a graphene plate; 9. a copper pipe; 10. a heat dissipation housing; 11. a heat conducting plate; 12. a heat sink; 13. a micro fan; 14. an air outlet net; 15. an air inlet net; 16. a temperature control assembly; 161. a sealing cylinder; 162. a heat dissipation plate; 163. a heat conducting pipe; 164. a heat conducting plate; 165. a piston; 166. a contact block; 167. a microswitch; 168. a return spring; 17. a heat conductive sheet; 18. a heat dissipation plate; 19. and (b) a mounting hole.
Detailed Description
The present invention will be further described with reference to the following examples.
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The condition in the embodiment can be further adjusted according to concrete condition the utility model discloses a it is right under the design prerequisite the utility model discloses a simple improvement of method all belongs to the utility model discloses the scope of claiming.
Referring to fig. 1-5, the utility model provides a cell phone case utilizing graphene for heat dissipation, which comprises a case 1, a charging hole 2, a switch key hole 3, a volume key hole 4 and a camera hole 5, wherein the charging hole 2, the switch key hole 3, the volume key hole 4 and the camera hole 5 are respectively arranged at the bottom of the case 1, the back of the case 1 is also provided with a mounting hole a7, the mounting hole a7 is positioned at one side of the camera hole 5, a graphene plate 8 is fixedly arranged in the mounting hole a7, the graphene plate 8 is positioned on the side wall inside the case 1 and is respectively fixedly connected with a plurality of copper tubes 9, and one ends of the copper tubes 9 far away from the graphene plate 8 are respectively connected with a heating device inside the cell phone (see fig. 1); the copper pipe 9 conducts heat to the heating part inside the mobile phone, and heat generated by the work of the heating part is transferred to the graphene plate 8.
The part, located outside the shell 1, of the graphene board 8 is covered in a heat dissipation shell 10, the heat dissipation shell 10 is fixedly connected to the back of the shell 1 and is integrally formed with the shell 1, the heat dissipation shell 10 is in an isosceles trapezoid structure, and the edge of the outer side wall of the heat dissipation shell 10 is in an arc edge structure (see fig. 2); the aesthetic property is good.
A plurality of heat conducting plates 11 arranged at equal intervals are fixedly connected to one side wall of a graphene plate 8 positioned in a heat dissipation shell 10, a plurality of heat dissipation fins 12 arranged in a staggered manner in sequence are arranged among the heat conducting plates 11, micro fans 13 are fixedly embedded on both sides of the heat dissipation shell 10, air outlet nets 14 are fixedly arranged on the two side walls of the heat dissipation shell 10 corresponding to the micro fans 13, air inlet nets 15 are respectively embedded on the upper side wall and the lower side wall of the outside of the heat dissipation shell 10, a temperature control component 16 is fixedly arranged on one side wall of the graphene plate 8 positioned in a shell 1, the temperature control component 16 comprises a sealing cylinder 161 fixedly connected to the side wall of the graphene plate 8 positioned in the shell 1, a heat dissipation disc 162 is fixedly arranged in the sealing cylinder 161, the heat dissipation disc 162 is fixedly connected to one end of the heat conducting pipe 163, the other end of the heat conducting pipe 163 penetrates through the sealing cylinder 161 to extend to the outside of the sealing cylinder 161 and is fixedly connected to a heat conduction disc 164, and the heat conducting disc 164, a piston 165 is elastically connected in the sealing cylinder 161 through a return spring 168, a contact block 166 is fixedly connected on one side wall of the piston 165 far away from the heat dissipation plate 162, a micro switch 167 is installed in the sealing cylinder 161 at a position corresponding to the contact block 166, and the micro switch 167 is electrically connected with the micro fan 13 (see fig. 1 and 5); through the effect of temperature control assembly 16, after heat gathering makes its temperature rise on graphite alkene board 8, through the effect of heat conduction dish 164 and heat pipe 163 with partial heat transfer to heat dissipation dish 162 on, the heat dissipation of heat dissipation dish 162 makes the inside air of sealing cylinder 161 be heated the inflation and promote piston 165 to remove, piston 165 removes and makes contact block 166 contact micro-gap switch 167, thereby make micro-fan 13 work and cool down the operation, but the work of automatic start micro-fan 13, thereby reach energy-conserving purpose, save power consumption.
The graphene plate 8 is fixedly connected with the heat dissipation plate 18 through a plurality of heat conducting fins 17 on one side wall inside the shell 1, the heat dissipation plate 18 is embedded in the mounting hole b19, and the mounting hole b19 is formed in the top of the shell 1 (see fig. 1); the heat of graphite alkene board 8 gathering also can be through conducting strip 17 with heat transfer to heating panel 18 on, by heating panel 18 passive heat dissipation, reaches dual heat dissipation, and the radiating effect is obvious, improves the radiating efficiency.
The four corners of the inner side wall of the shell 1 are fixedly provided with metal reinforcing sheets 6 (see figure 1); the anti-falling and anti-deformation performance of the four corners of the shell 1 is improved.
When the heat dissipation device is used, heat is conducted on a heat generating component inside a mobile phone through the copper pipe 9, heat generated by the work of the heat generating component is transferred to the graphene plate 8, when the heat on the graphene plate 8 is gathered to enable the temperature of the heat to rise, part of the heat is transferred to the heat dissipation disc 162 under the action of the heat conduction disc 164 and the heat conduction pipe 163, the heat dissipation disc 162 dissipates the heat to enable the air inside the sealing cylinder 161 to be heated and expanded and to push the piston 165 to move, the piston 165 moves and enables the contact block 166 to contact the micro switch 167, so that the micro fan 13 works to cool, the micro fan 13 works to accelerate the air circulation inside the heat dissipation shell 10, the graphene plate 8 transfers the heat to the heat dissipation fins 12 through the heat conduction plate 11, on one hand, the plurality of heat dissipation fins 12 are arranged in a staggered mode to improve the contact area with the air, on the other hand, the air flow is facilitated, meanwhile, the heat gathered on the graphene plate 8 can be transferred to the heat dissipation plate 18 through the heat conduction sheet 17, the heat dissipation plate 18 is used for passive heat dissipation, after the temperature is reduced, the temperature of the air inside the sealing cylinder 161 is reduced and does not extrude the piston 165 any more, the contact block 166 is far away from the micro switch 167 under the action of the reset spring 168, and the micro fan 13 is automatically turned off.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an utilize radiating cell phone case of graphite alkene, includes casing (1) and sets up respectively in the hole of charging (2) of casing (1) bottom, switch keyhole (3) of casing (1) a lateral wall, volume keyhole (4) and camera hole (5) at casing (1) back, its characterized in that: the back of the shell (1) is also provided with a mounting hole a (7), the mounting hole a (7) is positioned on one side of the camera hole (5), a graphene plate (8) is fixedly arranged in the mounting hole a (7), the graphene plate (8) is positioned on the side wall inside the shell (1) and is fixedly connected with a plurality of copper pipes (9) respectively, the part of the graphene plate (8) positioned outside the shell (1) is covered in a heat dissipation shell (10), the heat dissipation shell (10) is fixedly connected with the back of the shell (1) and is integrally formed with the shell (1), a plurality of heat conduction plates (11) which are arranged at equal intervals are fixedly connected on one side wall inside the heat dissipation shell (10) of the graphene plate (8), a plurality of radiating fins (12) which are sequentially and mutually staggered are arranged between the plurality of heat conduction plates (11), and micro fans (13) are embedded and fixedly connected on two sides of the heat dissipation shell (10), the position that corresponds miniature fan (13) on heat dissipation shell (10) both sides wall all has set firmly air-out net (14), all inlay on the last lateral wall of heat dissipation shell (10) outside and the lower lateral wall and be equipped with air inlet net (15), temperature control component (16) have set firmly on a lateral wall that graphite alkene board (8) are located casing (1) inside.
2. The mobile phone case using graphene for heat dissipation according to claim 1, wherein: and one ends of the copper pipes (9) far away from the graphene board (8) are respectively connected with a heating device in the mobile phone.
3. The mobile phone case using graphene for heat dissipation according to claim 1, wherein: the heat dissipation shell (10) is of an isosceles trapezoid structure, and the edge of the outer side wall of the heat dissipation shell (10) is of an arc edge structure.
4. The mobile phone case using graphene for heat dissipation according to claim 1, wherein: the temperature control assembly (16) comprises a sealing cylinder (161) fixedly connected to the side wall of the graphene plate (8) positioned in the shell (1), a heat dissipation disc (162) is fixedly arranged in the sealing cylinder (161), the heat dissipation disc (162) is fixedly connected with one end of the heat conduction pipe (163), the other end of the heat conduction pipe (163) penetrates through the sealing cylinder (161) to extend to the outer side of the sealing cylinder (161) and is fixedly connected with a heat conduction disc (164), the heat conducting disc (164) is fixedly connected on one side wall of the graphene plate (8) positioned in the shell (1), the sealing cylinder (161) is also elastically connected with a piston (165) through a return spring (168), and a contact block (166) is fixedly connected to one side wall of the piston (165) far away from the heat dissipation disc (162), a microswitch (167) is installed in the sealing cylinder (161) at a position corresponding to the contact block (166), and the microswitch (167) is electrically connected with the micro fan (13).
5. The mobile phone case using graphene for heat dissipation according to claim 1, wherein: the graphene plate (8) is located on one side wall inside the shell (1) and fixedly connected with the heat dissipation plate (18) through the plurality of heat conduction sheets (17), the heat dissipation plate (18) is embedded in the mounting hole b (19), and the mounting hole b (19) is formed in the top of the shell (1).
6. The mobile phone case using graphene for heat dissipation according to claim 1, wherein: the four corners department of casing (1) inside wall all sets firmly metal reinforcement piece (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021177405.XU CN212064096U (en) | 2020-06-23 | 2020-06-23 | Utilize radiating cell phone case of graphite alkene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021177405.XU CN212064096U (en) | 2020-06-23 | 2020-06-23 | Utilize radiating cell phone case of graphite alkene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212064096U true CN212064096U (en) | 2020-12-01 |
Family
ID=73514350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021177405.XU Expired - Fee Related CN212064096U (en) | 2020-06-23 | 2020-06-23 | Utilize radiating cell phone case of graphite alkene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212064096U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115379079A (en) * | 2021-05-21 | 2022-11-22 | 杭州海康威视数字技术股份有限公司 | Video camera |
| CN115379079B (en) * | 2021-05-21 | 2024-06-28 | 杭州海康威视数字技术股份有限公司 | Video camera |
-
2020
- 2020-06-23 CN CN202021177405.XU patent/CN212064096U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115379079A (en) * | 2021-05-21 | 2022-11-22 | 杭州海康威视数字技术股份有限公司 | Video camera |
| CN115379079B (en) * | 2021-05-21 | 2024-06-28 | 杭州海康威视数字技术股份有限公司 | Video camera |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212064096U (en) | Utilize radiating cell phone case of graphite alkene | |
| CN201336012Y (en) | Combined type heat-radiating shell and embedded computer | |
| CN212164042U (en) | Heat radiator suitable for capacitive load equipment | |
| CN205609503U (en) | Electric vehicle controller MOS manages heat radiation structure based on heat conduction base plate | |
| CN203133734U (en) | Completely-sealed chassis with radiating system | |
| CN2907006Y (en) | Sealing and heat dissipation structure for outdoor electric cabinet | |
| CN209119077U (en) | A kind of ion wind radiator | |
| CN205670907U (en) | A kind of double baseplate heat sink | |
| CN212411147U (en) | Small-space high-performance heat dissipation module and tablet computer | |
| CN201726609U (en) | Novel heat radiation casing | |
| CN210466270U (en) | Computer radiator with dustproof function | |
| CN202383586U (en) | Portable PC heat radiation apparatus | |
| CN202189312U (en) | Novel radiating device of personal computer (PC) | |
| CN218122607U (en) | Tablet personal computer with good heat dissipation effect | |
| CN219832190U (en) | Hard disk shell with metal heat transfer sheet | |
| CN218547441U (en) | Flat computer radiator | |
| CN214582735U (en) | High-efficiency energy-saving circulated volume heat exchange device | |
| CN219779584U (en) | Energy-saving heat dissipation power distribution cabinet | |
| CN220210842U (en) | Energy transmission equipment with heat radiation structure | |
| CN220420007U (en) | Vending machine control screen of improvement thermal diffusivity | |
| CN217823145U (en) | Cooling battery cover and mobile phone | |
| CN209843896U (en) | Heat dissipation type battery | |
| CN211827933U (en) | High heat dissipation type display screen module | |
| CN219778185U (en) | Timing switch electric device for computer | |
| CN213073488U (en) | Power heat dissipation dustproof box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201201 |