CN219804438U - Waste gas recovery device - Google Patents
Waste gas recovery device Download PDFInfo
- Publication number
- CN219804438U CN219804438U CN202321351566.XU CN202321351566U CN219804438U CN 219804438 U CN219804438 U CN 219804438U CN 202321351566 U CN202321351566 U CN 202321351566U CN 219804438 U CN219804438 U CN 219804438U
- Authority
- CN
- China
- Prior art keywords
- pipe
- tank assembly
- assembly
- drying
- exhaust gas
- 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.)
- Active
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 239000002912 waste gas Substances 0.000 title description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 13
- 239000000741 silica gel Substances 0.000 claims description 13
- 229910002027 silica gel Inorganic materials 0.000 claims description 13
- 239000002274 desiccant Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 27
- 238000006243 chemical reaction Methods 0.000 abstract description 16
- 239000012535 impurity Substances 0.000 abstract description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 36
- 229910002092 carbon dioxide Inorganic materials 0.000 description 18
- 239000001569 carbon dioxide Substances 0.000 description 18
- 239000007789 gas Substances 0.000 description 15
- 238000005057 refrigeration Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses an exhaust gas recovery device, which belongs to the technical field of exhaust gas recovery and comprises a bottom plate, wherein a reaction tank assembly is arranged above the bottom plate, a water storage tank is arranged on one side of the reaction tank assembly, a gas transmission pipe is arranged on one side of the reaction tank assembly away from the water storage tank, an exhaust assembly is arranged below one end of the gas transmission pipe away from the reaction tank assembly, a heating assembly is arranged on one side of the reaction tank assembly and above the water storage tank, an input pipe is arranged on one side of the heating assembly away from the reaction tank assembly, the heating assembly is connected with the input pipe through a filtering spraying device, and a drying and cooling device is arranged at the position close to the center of the gas transmission pipe; according to the utility model, the filtering spraying device is arranged, so that the device can prevent the filter screen from being blocked when large-scale impurities are filtered through spraying when required, and the impurities can be discharged along with sprayed water when required, so that the working capacity of the device is improved.
Description
Technical Field
The utility model belongs to the technical field of waste gas recovery, and particularly relates to a waste gas recovery device.
Background
Exhaust gas refers to toxic and harmful gases discharged by human beings in the production and living processes. Harmful exhaust gas is generated during the production of chemical products such as propylene oxide and acrylic acid.
Chinese patent application No. 202021102737.1 discloses an exhaust gas recovery device convenient to cyclic treatment, includes: a base; the reaction tank is fixedly connected to the top of the base; the heating assembly is arranged at the top of the left side of the reaction tank; the driving piece is arranged at the bottom of the inner wall of the reaction tank; the circulating purification assembly is arranged on two sides of the driving piece and comprises an ultraviolet lamp and a purifier, the purifier is fixedly connected to two sides of the driving piece, and a containing tube is arranged inside the purifier. The utility model provides an exhaust gas recovery device convenient for cyclic treatment, which is provided with a heating assembly, can filter and heat large-scale dust impurities in exhaust gas, can rapidly purify the exhaust gas, has the combined action of a plurality of internal purifiers and a plurality of heating pipes, can ensure thorough exhaust gas purification, does not generate secondary pollution, and has better purification effect.
1. The above-mentioned publication has problems in that it is easy to be blocked and the discharge of impurities is inconvenient when large-sized impurities are filtered, thereby reducing the working capacity of the apparatus; 2. the above-mentioned publication has the problem that the discharged carbon dioxide easily contains a large amount of moisture and easily has a high temperature, thereby reducing the practicality of the device.
Disclosure of Invention
To solve the problems set forth in the background art. The utility model provides an exhaust gas recovery device which has the characteristics of high working capacity and strong practicability.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an exhaust gas recovery device, includes the bottom plate, the retort subassembly is installed to the top of bottom plate, and the storage water tank is installed to one side of retort subassembly, and the gas-supply pipe is installed to one side that the storage water tank was kept away from to the retort subassembly, and the subassembly of airing exhaust is installed to one side that the gas-supply pipe kept away from the retort subassembly and is located the position of storage water tank top, and the heating up subassembly is kept away from one side of retort subassembly and is provided with the input tube, is connected through filtering spray set between heating up subassembly and the input tube, and the drying heat sink is installed to the gas-supply pipe near central point.
Preferably, the filtering spraying device comprises a fixed box, a spray head, a pump body, a connecting pipe and a filter screen, wherein the heating assembly is connected with the input pipe through the fixed box, the filter screen is arranged on the inner side of the fixed box, the pump body is arranged above the fixed box, the connecting pipe is arranged below the liquid outlet end of the pump body and at the position above the inner side of the fixed box and the filter screen, and a plurality of spray heads are arranged on one side of the connecting pipe, which is close to the filter screen.
Preferably, the filtering spraying device further comprises a valve and a drain pipe, wherein the drain pipe is arranged at one side of the fixed box and positioned below the input pipe, and the valve is arranged at the position close to the center of the drain pipe.
Preferably, the drying and cooling device comprises a support plate, a silica gel drying agent, a separation net and a connecting frame, wherein two support plates are arranged at the central position of the gas transmission pipe, the connecting frame is arranged between the two support plates, two separation nets are arranged at the inner side of the connecting frame, and the silica gel drying agent is filled at the inner side of the connecting frame and at the position between the two separation nets.
Preferably, the drying and cooling device further comprises a plurality of refrigerating rods, and the refrigerating rods are arranged at the inner side of the connecting frame and at the positions on one side of the two separation nets.
Preferably, the drying and cooling device further comprises a mounting plate and buckles, wherein the mounting plate is mounted above the connecting frame, and the mounting plate is connected with the two support plates through the two buckles.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, the filtering spraying device is arranged, so that the device can prevent the filter screen from being blocked when large-scale impurities are filtered through spraying when required, and the impurities can be discharged along with sprayed water when required, so that the working capacity of the device is improved.
2. According to the utility model, the drying and cooling device is arranged, so that the device can perform certain drying and cooling treatment on the discharged carbon dioxide through the silica gel drying agent and the refrigerating rod when required, thereby better meeting the working requirements and further improving the practicability of the device.
Drawings
FIG. 1 is a perspective view of the present utility model;
FIG. 2 is a schematic diagram of the structure of the present utility model;
FIG. 3 is a schematic diagram of a filter spray device of the present utility model;
fig. 4 is a schematic structural diagram of the drying and cooling device of the present utility model.
In the figure: 1. an input tube; 2. a filtering spray device; 21. a fixed box; 22. a spray head; 23. a pump body; 24. a connecting pipe; 25. a filter screen; 26. a valve; 27. a drain pipe; 3. a water storage tank; 4. a bottom plate; 5. an exhaust assembly; 6. a gas pipe; 7. drying and cooling device; 71. a support plate; 72. a buckle; 73. silica gel drying agent; 74. a mounting plate; 75. a screen; 76. a refrigeration rod; 77. a connection frame; 8. a reaction tank assembly; 9. and a temperature raising component.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1-4, the present utility model provides the following technical solutions: the utility model provides an exhaust gas recovery device, including bottom plate 4, retort subassembly 8 is installed to the top of bottom plate 4, storage water tank 3 is installed to one side of retort subassembly 8, gas-supply pipe 6 is installed to one side that retort subassembly 8 kept away from storage water tank 3, exhaust subassembly 5 is installed to one end below that retort subassembly 8 was kept away from to gas-supply pipe 6, heating up subassembly 9 is installed to one side of retort subassembly 8 and the position that is located storage water tank 3 top, one side that retort subassembly 8 was kept away from to heating up subassembly 9 is provided with input tube 1, be connected through filtering spray set 2 between heating up subassembly 9 and the input tube 1, drying heat sink 7 is installed to the gas-supply pipe 6 by the central point.
Specifically, the filtering spraying device 2 comprises a fixed box 21, a spray head 22, a pump body 23, a connecting pipe 24 and a filter screen 25, wherein the heating assembly 9 is connected with the input pipe 1 through the fixed box 21, the filter screen 25 is installed on the inner side of the fixed box 21, the pump body 23 is installed on the upper side of the fixed box 21, the connecting pipe 24 is installed below the liquid outlet end of the pump body 23 and at the positions of the inner side of the fixed box 21 and the upper side of the filter screen 25, and a plurality of spray heads 22 are installed on one side of the connecting pipe 24 close to the filter screen 25.
By adopting the above technical scheme, the device can prevent the filter screen 25 from blocking when filtering large-scale impurities through spraying when required.
Specifically, the filter shower 2 further includes a valve 26 and a drain pipe 27, the drain pipe 27 is installed at a position below the input pipe 1 on one side of the stationary box 21, and the valve 26 is installed at a position near the center of the drain pipe 27.
By adopting the technical scheme, the device can enable impurities to be discharged along with sprayed water when needed.
When the device is used in this embodiment, when the waste gas generated during the production of chemical products such as propylene oxide and acrylic acid is required to be recycled, the liquid inlet end of the pump body 23 in the filtering spraying device 2 is required to be connected with an external water source through a pipeline in advance, then the waste gas is sent into the input pipe 1, then the waste gas enters the fixed box 21, the pump body 23 is started, the pump body 23 sends water into the connecting pipe 24, then the water is sprayed out from each spray head 22, so that the waste gas is sprayed, impurities on the filter screen 25 are simultaneously flushed down, the filter screen 25 is prevented from being blocked, the waste gas enters the heating assembly 9 after being filtered by the filter screen 25, the heating assembly 9 heats the waste gas, then the heated waste gas enters the reaction tank assembly 8, the reaction tank assembly 8 processes the waste gas, so that the waste gas is decomposed and converted into pollution-free carbon dioxide and water, then the exhaust assembly 5 is operated, the carbon dioxide is pumped out through the gas pipe 6, and the water is stored in the water storage tank 3, thus the waste gas is recycled, the valve 26 can be opened when required, then the impurities are discharged from the drain pipe 27, and the bottom plate 4 plays a supporting role.
Example 2
This embodiment differs from embodiment 1 in that: the drying and cooling device 7 comprises a support plate 71, a silica gel drying agent 73, a separation net 75 and a connecting frame 77, wherein the two support plates 71 are arranged at the position, close to the center, of the air pipe 6, the connecting frame 77 is arranged between the two support plates 71, the two separation nets 75 are arranged on the inner side of the connecting frame 77, and the silica gel drying agent 73 is filled at the position, located between the two separation nets 75, of the inner side of the connecting frame 77.
Through adopting above-mentioned technical scheme for the device can carry out certain drying treatment to exhaust carbon dioxide through silica gel drier 73 when needs, thereby satisfies the needs of work better.
Specifically, the drying and cooling device 7 further includes a plurality of cooling bars 76, and a plurality of cooling bars 76 are installed at positions located on one side of the two screens 75 inside the connection frame 77.
By adopting the above technical scheme, the device can carry out certain drying and cooling treatment on the discharged carbon dioxide through the refrigeration rod 76 when required, thereby better meeting the working requirement.
Specifically, the drying and cooling device 7 further includes a mounting plate 74 and a buckle 72, the mounting plate 74 is mounted above the connecting frame 77, and the mounting plate 74 is connected with the two support plates 71 through the two buckles 72.
By adopting the above technical scheme, the staff can assemble and disassemble the structures such as the connecting frame 77 and the like when required.
When the air exhaust assembly 5 is used, carbon dioxide enters a connecting frame 77 between two support plates 71 in the drying and cooling device 7 along the air pipe 6 when the air exhaust assembly is in operation, then the carbon dioxide contacts with a silica gel drying agent 73 between two separation nets 75, moisture in the carbon dioxide is absorbed by the silica gel drying agent 73, and then each refrigeration rod 76 is started to cool the carbon dioxide, so that the phenomenon that a large amount of moisture is contained in the discharged carbon dioxide or the temperature is too high is prevented, and the buckle 72 and the mounting plate 74 play a role in connection and mounting.
The utility model discloses a water storage tank 3, an exhaust assembly 5 consisting of an exhaust fan and an exhaust pipe, a reaction tank assembly 8 consisting of a reaction tank, a grid plate, a driving part, a motor case, a central rod, a driven gear, a motor, a straight rod, a driving gear, a heating pipe, an ultraviolet lamp, a purifier and a containing pipe, and a structure and a principle of a heating assembly 9 consisting of a treatment tank, a through pipe, an electric heating pipe, a flame retardant and an air inlet pipe.
The structure and principle of the refrigeration rod 76 in the utility model are disclosed in a kiln high-temperature cooling device for producing light calcium carbonate disclosed in China patent application No. 202022664354.X, and the working principle is that the periphery is refrigerated after being electrified.
The working principle and the using flow of the utility model are as follows: when the device is required to recycle the waste gas generated during the production of chemical products such as propylene oxide, acrylic acid and the like, the liquid inlet end of the pump body 23 in the filtering spraying device 2 is required to be connected with an external water source through a pipeline in advance, then the waste gas is sent into the input pipe 1, the waste gas enters the fixed box 21, the pump body 23 is started, the pump body 23 sends water into the connecting pipe 24, then the water is sprayed out from each spray head 22, the waste gas is sprayed, impurities on the filter screen 25 are simultaneously flushed down, the filter screen 25 is prevented from being blocked, the waste gas enters the heating assembly 9 after being filtered by the filter screen 25, the heating assembly 9 heats the waste gas, the heated waste gas enters the reaction tank assembly 8, the reaction tank assembly 8 processes the waste gas to be decomposed and converted into pollution-free carbon dioxide and water, then the exhaust assembly 5 is operated, the carbon dioxide is pumped out through the gas pipe 6, and the water is stored in the water storage tank 3, so that the valve 26 can be opened when required, and then the impurities are discharged from the water drain pipe 27, and the bottom plate 4 plays a supporting role; when the exhaust assembly 5 works, carbon dioxide enters a connecting frame 77 between two support plates 71 in the drying and cooling device 7 along the air pipe 6, then the carbon dioxide contacts with a silica gel drying agent 73 between two separation nets 75, moisture in the carbon dioxide is absorbed by the silica gel drying agent 73, and then each refrigeration rod 76 is started to cool the carbon dioxide, so that the phenomenon that a large amount of moisture is contained in the discharged carbon dioxide or the temperature is too high is prevented, and the buckle 72 and the mounting plate 74 play a role in connection and mounting.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An exhaust gas recovery device, includes bottom plate, its characterized in that: the utility model discloses a drying cooling device, including bottom plate, tank assembly, gas-supply pipe, heating assembly, filtering spray device, heating assembly and cooling device, the tank assembly is installed to the top of bottom plate, and the tank assembly is installed to one side of tank assembly, and the gas-supply pipe is installed to one side of tank assembly keep away from the tank assembly, and the gas-supply pipe is installed to one side of tank assembly and the position that is located the tank assembly top is installed to the one side of tank assembly, and the heating assembly is kept away from one side of tank assembly and is provided with the input tube, is connected through filtering spray device between heating assembly and the input tube, and the drying cooling device is installed to the gas-supply pipe near central point.
2. An exhaust gas recovery apparatus as defined in claim 1, wherein: the filtering spraying device comprises a fixed box, a spray head, a pump body, a connecting pipe and a filter screen, wherein the heating assembly is connected with the input pipe through the fixed box, the filter screen is arranged on the inner side of the fixed box, the pump body is arranged above the fixed box, the connecting pipe is arranged below the liquid outlet end of the pump body and at the position above the inner side of the fixed box and the filter screen, and a plurality of spray heads are arranged on one side of the connecting pipe, which is close to the filter screen.
3. An exhaust gas recovery apparatus as defined in claim 2, wherein: the filtering and spraying device further comprises a valve and a drain pipe, the drain pipe is arranged on one side of the fixed box and positioned below the input pipe, and the valve is arranged at the position, close to the center, of the drain pipe.
4. An exhaust gas recovery apparatus as defined in claim 1, wherein: the drying and cooling device comprises a support plate, a silica gel drying agent, a separation net and a connecting frame, wherein two support plates are arranged at the central position of the gas transmission pipe, the connecting frame is arranged between the two support plates, two separation nets are arranged on the inner side of the connecting frame, and the silica gel drying agent is filled at the position between the two separation nets on the inner side of the connecting frame.
5. An exhaust gas recovery apparatus as defined in claim 4, wherein: the drying and cooling device further comprises refrigerating rods, and a plurality of refrigerating rods are arranged at the inner side of the connecting frame and at the positions of one sides of the two separation nets.
6. An exhaust gas recovery apparatus as defined in claim 4, wherein: the drying and cooling device further comprises a mounting plate and buckles, wherein the mounting plate is mounted above the connecting frame, and the mounting plate is connected with the two support plates through the two buckles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321351566.XU CN219804438U (en) | 2023-05-29 | 2023-05-29 | Waste gas recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321351566.XU CN219804438U (en) | 2023-05-29 | 2023-05-29 | Waste gas recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219804438U true CN219804438U (en) | 2023-10-10 |
Family
ID=88214147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321351566.XU Active CN219804438U (en) | 2023-05-29 | 2023-05-29 | Waste gas recovery device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219804438U (en) |
-
2023
- 2023-05-29 CN CN202321351566.XU patent/CN219804438U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208852625U (en) | A kind of new and effective scrubbing tower | |
| CN108211657A (en) | A kind of energy-saving and environment-friendly device for processing laboratory waste gas | |
| CN110013754A (en) | A kind of equipment for treating industrial waste gas of high-efficiency environment friendly | |
| CN108671662A (en) | A kind of off-gas cleaning equipment of the chemical machinery production with filtering function | |
| CN110193262A (en) | A kind of air cleaning unit based on ultrasonic technique | |
| CN210186827U (en) | Waste gas purifier capable of recovering waste heat | |
| CN219804438U (en) | Waste gas recovery device | |
| CN214536235U (en) | VOCs exhaust-gas treatment burning purification treatment equipment | |
| CN108619817A (en) | A kind of low temperature plasma waste gas cleaning equipment | |
| CN211245939U (en) | Energy-concerving and environment-protective mill exhaust treatment device | |
| CN115920583A (en) | Active carbon exhaust treatment device | |
| CN218924236U (en) | Waste gas treatment device of foaming plate forming machine | |
| CN215742476U (en) | Activated carbon adsorption desorption box | |
| CN111594956A (en) | Air purification device for compound fertilizer production workshop | |
| CN206474001U (en) | Emission-control equipment | |
| CN210448616U (en) | Waste gas treatment device of film blowing machine | |
| CN214972900U (en) | VOC exhaust treatment device and exhaust absorption tower | |
| CN208493608U (en) | A kind of chemical machinery production off-gas cleaning equipment with filtering function | |
| CN209763379U (en) | Air purification device for compound fertilizer production workshop | |
| CN220472332U (en) | Flue gas treatment device for electric melting furnace | |
| JP3244104U (en) | Treatment equipment for exhaust gas emitted from thermal power generation | |
| CN216688015U (en) | Cooling equipment for biochar production process | |
| CN218944691U (en) | Exhaust treatment device for ethylene carbonate | |
| CN218915346U (en) | Condensate water recovery device of central air conditioner | |
| CN218047147U (en) | Chemical tail gas treatment pressure reactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |