CN219630864U - Waste gas treatment equipment for urea-formaldehyde resin production - Google Patents
Waste gas treatment equipment for urea-formaldehyde resin production Download PDFInfo
- Publication number
- CN219630864U CN219630864U CN202320577208.4U CN202320577208U CN219630864U CN 219630864 U CN219630864 U CN 219630864U CN 202320577208 U CN202320577208 U CN 202320577208U CN 219630864 U CN219630864 U CN 219630864U
- Authority
- CN
- China
- Prior art keywords
- box body
- fixedly arranged
- rod
- resin production
- gas treatment
- 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
- 229920001807 Urea-formaldehyde Polymers 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 239000002912 waste gas Substances 0.000 title abstract description 22
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 title description 10
- 239000007788 liquid Substances 0.000 claims abstract description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 239000012535 impurity Substances 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 10
- 238000000746 purification Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model relates to the technical field of waste gas treatment, and discloses waste gas treatment equipment for urea resin production, which comprises a box body, wherein a T-shaped rod movably penetrates through the middle part of the top wall of the box body, a liquid box is fixedly arranged on one side of the top of the box body, and a supporting rod is fixedly arranged on the top of the box body; the middle part fixed mounting has the frame in the box, and fixed mounting has the filter screen in the frame, and strip shaped plate has been placed to filter screen one side. According to the utility model, the T-shaped rod, the rack and the cross rod are arranged, so that when the filter screen is blocked in the use process of the waste gas treatment equipment for urea resin production, the T-shaped rod can swing up and down to drive the rack to rotate synchronously, and as the cross rod is rotationally connected with the support rod, the cross rod can be driven to rotate through the rack, the cross rod drives the strip-shaped plate to rotate, and the bristles on one side of the strip-shaped plate push out the blocked impurities in the filter holes of the filter screen.
Description
Technical Field
The utility model relates to the technical field of waste gas treatment, in particular to waste gas treatment equipment for urea resin production.
Background
Exhaust gas refers to toxic and harmful gases discharged by human beings in the production and living processes. In particular to chemical plants, steel plants, pharmaceutical plants, coking plants, oil refineries and the like, the exhaust gas exhausted by the chemical plants, the steel plants, the pharmaceutical plants, the coking plants, the oil refineries and the like has large smell, seriously pollutes the environment and affects the health of human bodies, and the exhaust gas can be exhausted in the urea-formaldehyde resin production process, so that corresponding exhaust gas treatment equipment is required to be provided for purification treatment.
In the process of implementing the present utility model, the inventors found that the following problems in the prior art are not solved: the existing urea-formaldehyde resin production waste gas treatment equipment does not have a non-unpacking and blocking clearing function, once a filter screen is blocked, workers are required to open an access hole for manual blocking clearing, then the access hole is closed again, the urea-formaldehyde resin production waste gas treatment equipment completely depends on unpacking and clearing, and then the urea-formaldehyde resin production efficiency is indirectly influenced by shutting down and clearing for too long time, so that improvement is needed urgently, and the urea-formaldehyde resin production waste gas treatment equipment is provided.
Disclosure of Invention
The utility model aims to provide exhaust gas treatment equipment for urea resin production, which solves the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the waste gas treatment equipment for urea resin production comprises a box body, wherein a T-shaped rod movably penetrates through the middle of the top wall of the box body, a liquid box is fixedly arranged on one side of the top of the box body, and a supporting rod is fixedly arranged on the top of the box body;
a frame is fixedly arranged in the middle part in the box body, a filter screen is fixedly arranged in the frame, and a strip-shaped plate is arranged on one side of the filter screen;
the middle parts of two sides of the box body are respectively communicated with an air inlet pipe and an air outlet pipe, visual windows are fixedly arranged on two sides of the front wall of the box body, a liquid discharge pipe is communicated with the bottom of one side wall of the box body, a valve is arranged on the liquid discharge pipe, and supporting rods are fixedly arranged at four edges of the bottom of the box body;
the brush hair is fixedly arranged on one side of the strip-shaped plate, a cross rod is fixedly arranged on one side of the strip-shaped plate, which is opposite to the brush hair, the cross rod is rotationally connected with the supporting rod through a bearing, and a gear is fixedly arranged on the outer side of the middle part of the cross rod;
the bottom end of the T-shaped rod is fixedly provided with a rack, the rack is meshed with the gear, and the outer side of the middle part of the T-shaped rod is sleeved with a spring;
one side fixed mounting that liquid case was kept away from to the box top has the battery, and integrated into one piece is provided with the switch on the battery, the subassembly cooperation such as accessible T type pole, rack and horizontal pole is used, in urea-formaldehyde resin production exhaust treatment equipment use, the accessible T type pole is swung from top to bottom, can drive rack synchronous rotation, because horizontal pole and branch rotate to be connected, can drive the horizontal pole through the rack and rotate, the horizontal pole drives the strip board and rotates, impurity that blocks up in the filtration pore of the ejecting filter screen of brush hair on one side of the strip board, this structural design, reducible unpacking clearance frequency, indirectly promote exhaust treatment efficiency.
As an alternative scheme of the technical scheme of the utility model, an electromagnet is fixedly arranged on one side of the top end of the T-shaped rod, an iron block is arranged on the right lower side of the electromagnet, the iron block is fixedly connected with the box body, the electromagnet is electrically connected with the storage battery through a lead, the electromagnet and a spring and other components can be matched for use, in the process of adjusting the T-shaped rod, the electromagnet can be started to generate a magnetic field and is adsorbed and positioned on the iron block, the T-shaped rod can be driven to move downwards, otherwise, the electromagnet is closed, the spring can lift the T-shaped rod to move upwards, the up-and-down swinging of the T-shaped rod is realized in such a way, the force application and the adjustment are not needed, and the cleaning burden is reduced.
As an alternative scheme of the technical scheme of the utility model, the bottom of the front wall of the liquid tank is communicated with a liquid pump, the bottom of the liquid pump is communicated with a spray head, the spray head is positioned in the tank body, and the liquid pump and the spray head are matched to spray the purification in the liquid tank and fully contact with the waste gas for the secondary purification treatment of the waste gas.
As an alternative of the technical scheme of the utility model, the sealing gasket is fixedly arranged on the upper end surface of the rack close to the outer side of the T-shaped rod, and the sealing gasket is deformed between the rack and the box body under pressure, so that the through hole of the box body can be sealed by the sealing gasket to prevent the air leakage during the non-cleaning period.
As an alternative scheme of the technical scheme of the utility model, a through hole is formed in one side of the bottom wall of the box body, a concave table is formed in the lower side of the box body, which is close to the through hole, a cover plate is clamped in the concave table, bolts are movably penetrated at four corners of the cover plate, the bolts are screwed with preset screw holes in the box body through threads, the cover plate can be detachably fixed in the box body through the bolts, and the cover plate can be detached for manual cleaning and cleaning at the later stage to remove blockage which cannot be finished.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the waste gas treatment equipment for urea resin production, the T-shaped rod, the rack and the cross rod are arranged, when the filter screen is blocked in the use process of the waste gas treatment equipment for urea resin production, the rack can be driven to rotate synchronously through the up-down swing of the T-shaped rod, and as the cross rod is rotationally connected with the support rod, the cross rod can be driven to rotate through the rack, the cross rod drives the strip-shaped plate to rotate, and blocked impurities in the filter holes of the filter screen are ejected out through bristles on one side of the strip-shaped plate.
2. According to the waste gas treatment equipment for urea resin production, the electromagnet and the spring are arranged, so that in the process of adjusting the T-shaped rod, the electromagnet can be started to generate a magnetic field and is adsorbed and positioned on the iron block, the T-shaped rod can be driven to move downwards, otherwise, the electromagnet is closed, the spring can lift the T-shaped rod to move upwards, the up-and-down swing of the T-shaped rod is realized circularly, the force application and the movement are not needed, and the cleaning burden is reduced.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the whole front view of an exhaust gas treatment apparatus for urea resin production according to the present utility model;
FIG. 2 is a schematic view showing the overall front cross-sectional structure of an exhaust gas treatment apparatus for urea resin production according to the present utility model;
fig. 3 is an enlarged schematic view of the structure of the position a of the exhaust gas treatment device for urea resin production.
In the figure: 1. a case; 11. an air inlet pipe; 12. an air outlet pipe; 13. a visual window; 14. a brace rod; 15. a liquid discharge pipe; 16. a cover plate; 17. a through port; 2. a storage battery; 21. a switch; 3. an electromagnet; 31. iron blocks; 4. a T-shaped rod; 41. a spring; 42. a rack; 5. a liquid tank; 51. a liquid pump; 52. a spray head; 6. a support rod; 61. a bearing; 62. a cross bar; 63. a gear; 7. a strip-shaped plate; 71. brushing; 8. a frame; 81. and (5) a filter screen.
Detailed Description
The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.
Referring to fig. 1-3, the present utility model provides a technical solution: the waste gas treatment equipment for urea resin production comprises a box body 1, wherein a T-shaped rod 4 movably penetrates through the middle of the top wall of the box body 1, a liquid box 5 is fixedly arranged on one side of the top of the box body 1, and a supporting rod 6 is fixedly arranged on the top of the box body 1; the middle part in the box body 1 is fixedly provided with a frame 8, the frame 8 is internally fixedly provided with a filter screen 81, one side of the filter screen 81 is provided with a strip-shaped plate 7, one side of the bottom wall of the box body 1 is provided with a through hole 17, the lower side of the box body 1 close to the through hole 17 is provided with a concave table, a cover plate 16 is clamped in the concave table, four corners of the cover plate 16 are movably penetrated with bolts, the bolts are screwed with screw holes preset on the box body 1 through threads, the cover plate 16 can be detachably fixed in the box body 1 through the bolts, and the later stage can be cleaned and cleaned manually through the cover plate 16 to remove the blockage which cannot be finished; the middle parts of two sides of the box body 1 are respectively communicated with an air inlet pipe 11 and an air outlet pipe 12, two sides of the front wall of the box body 1 are fixedly provided with a visual window 13, the bottom of one side wall of the box body 1 is communicated with a liquid discharge pipe 15, a valve is arranged on the liquid discharge pipe 15, and four edges of the bottom of the box body 1 are fixedly provided with supporting rods 14; the brush hair 71 is fixedly arranged on one side of the strip-shaped plate 7, the cross rod 62 is fixedly arranged on one side of the strip-shaped plate 7, which is opposite to the brush hair 71, the cross rod 62 is rotationally connected with the supporting rod 6 through the bearing 61, and the gear 63 is fixedly arranged on the outer side of the middle part of the cross rod 62; the bottom end of the T-shaped rod 4 is fixedly provided with a rack 42, the rack 42 is meshed with a gear 63, the outer side, close to the T-shaped rod 4, of the upper end face of the rack 42 is fixedly provided with a sealing gasket, the sealing gasket is pressed and deformed between the rack 42 and the box 1, and the through hole of the box 1 can be sealed through the sealing gasket so as to prevent air leakage during non-cleaning, and the outer side of the middle part of the T-shaped rod 4 is sleeved with a spring 41; one side of box 1 top keeping away from liquid case 5 fixed mounting has battery 2, and integrated into one piece is provided with switch 21 on the battery 2, and liquid case 5 antetheca bottom intercommunication is provided with liquid pump 51, and liquid pump 51 bottom intercommunication is provided with shower nozzle 52, and shower nozzle 52 is located box 1, and the accessible liquid pump 51 sprays the purification in the liquid case 5 with shower nozzle 52's cooperation to fully contact with waste gas for the secondary purification treatment of waste gas.
In this kind of technical scheme, accessible T type pole 4, subassembly cooperation such as rack 42 and horizontal pole 62 are used, in urea-formaldehyde resin production exhaust treatment equipment use, whenever filter screen 81 appears blocking up the situation, accessible T type pole 4 reciprocates, can drive rack 42 synchronous rotation, because horizontal pole 62 is connected with branch 6 rotation, can drive horizontal pole 62 through rack 42 and rotate, horizontal pole 62 drives strip 7 rotation, the impurity of the internal jam of filter screen 81 of brush hair 71 of strip 7 one side, this structural design can reduce unpacking clearance frequency, indirectly promote exhaust treatment efficiency.
In some technical schemes, an electromagnet 3 is fixedly arranged on one side of the top end of a T-shaped rod 4, an iron block 31 is arranged on the right lower side of the electromagnet 3, the iron block 31 is fixedly connected with a box body 1, and the electromagnet 3 is electrically connected with a storage battery 2 through a wire.
In this kind of technical scheme, accessible electromagnet 3 and subassembly cooperation such as spring 41 use, and at the in-process of adjusting T type pole 4, the accessible opens electromagnet 3, and electromagnet 3 produces the magnetic field to adsorb the location on iron piece 31, can drive T type pole 4 and move down, otherwise close electromagnet 3, spring 41 can jack up T type pole 4 and move up, and the up-and-down swing of T type pole 4 is realized to the circulation like this, need not to use the manpower application of force to transfer, reduces the clearance burden.
Working principle: it should be noted that the present utility model is an exhaust gas treatment device for urea resin production, the components are all universal standard components or components known to those skilled in the art, and the structures and principles thereof are all known to those skilled in the art through technical manuals or through conventional test methods.
When the waste gas treatment equipment for urea resin production is used, the box body 1 is fixed at a specified position through the stay bar 14, the exhaust pipeline of the urea resin production equipment is externally connected through the air inlet pipe 11, urea resin waste gas is filtered through the filter screen 81, and then the purification liquid sprayed by the spray head 52 is sprayed and is discharged through the air outlet pipe 12 for purification of the waste gas in urea resin production;
through being provided with T type pole 4, rack 42 and horizontal pole 62, in urea-formaldehyde resin production exhaust treatment equipment use, whenever filter screen 81 appears blocking up the situation, accessible T type pole 4 is swung from top to bottom, can drive rack 42 synchronous rotation, because horizontal pole 62 is connected with branch 6 rotation, can drive horizontal pole 62 rotation through rack 42, horizontal pole 62 drives strip board 7 rotation, the impurity of the filtration downthehole jam of filter screen 81 is ejected to brush hair 71 through strip board 7 one side, this structural design, can reduce unpacking clearance frequency, indirectly promote exhaust treatment efficiency, through being provided with electro-magnet 3 and spring 41, in the regulation T type pole 4 in-process, the accessible opens electro-magnet 3, electro-magnet 3 produces the magnetic field, and adsorb the location on iron piece 31, can drive T type pole 4 and move down, otherwise close electro-magnet 3, spring 41 can jack up T type pole 4 and move, so the circulation realizes T type pole 4's swing from top to bottom, need not to use manpower application to transfer, reduce the clearance burden.
Claims (5)
1. An exhaust treatment device for urea resin production, which is characterized in that: the novel water tank comprises a tank body (1), wherein a T-shaped rod (4) movably penetrates through the middle of the top wall of the tank body (1), a liquid tank (5) is fixedly arranged on one side of the top of the tank body (1), and a supporting rod (6) is fixedly arranged on the top in the tank body (1);
a frame (8) is fixedly arranged in the middle of the inside of the box body (1), a filter screen (81) is fixedly arranged in the frame (8), and a strip-shaped plate (7) is arranged on one side of the filter screen (81);
the middle parts of two sides of the box body (1) are respectively communicated with an air inlet pipe (11) and an air outlet pipe (12), visual windows (13) are fixedly arranged on two sides of the front wall of the box body (1), a drain pipe (15) is communicated with the bottom of one side wall of the box body (1), a valve is arranged on the drain pipe (15), and supporting rods (14) are fixedly arranged at four edges and corners of the bottom of the box body (1);
brushing hair (71) is fixedly arranged on one side of the strip-shaped plate (7), a cross rod (62) is fixedly arranged on one side, facing away from the brushing hair (71), of the strip-shaped plate (7), the cross rod (62) is rotationally connected with the supporting rod (6) through a bearing (61), and a gear (63) is fixedly arranged on the outer side of the middle part of the cross rod (62);
a rack (42) is fixedly arranged at the bottom end of the T-shaped rod (4), the rack (42) is meshed with a gear (63), and a spring (41) is sleeved on the outer side of the middle part of the T-shaped rod (4);
one side of box (1) top keeping away from liquid case (5) fixed mounting has battery (2), and integrated into one piece is provided with switch (21) on battery (2).
2. The exhaust gas treatment apparatus for urea resin production as set forth in claim 1, wherein: the T-shaped rod is characterized in that an electromagnet (3) is fixedly arranged on one side of the top end of the T-shaped rod (4), an iron block (31) is arranged on the right lower side of the electromagnet (3), the iron block (31) is fixedly connected with the box body (1), and the electromagnet (3) is electrically connected with the storage battery (2) through a lead.
3. The exhaust gas treatment apparatus for urea resin production as set forth in claim 1, wherein: the front wall bottom of the liquid tank (5) is communicated with a liquid pump (51), a spray head (52) is communicated with the bottom of the liquid pump (51), and the spray head (52) is located in the tank body (1).
4. The exhaust gas treatment apparatus for urea resin production as set forth in claim 1, wherein: the sealing gasket is fixedly arranged on the upper end face of the rack (42) close to the outer side of the T-shaped rod (4), and is pressed and deformed between the rack (42) and the box body (1).
5. The exhaust gas treatment apparatus for urea resin production as set forth in claim 1, wherein: the novel box is characterized in that a through hole (17) is formed in one side of the bottom wall of the box body (1), a concave table is formed in the lower side, close to the through hole (17), of the box body (1), a cover plate (16) is clamped in the concave table, bolts are movably penetrated at four corners of the cover plate (16), and the bolts are screwed with screw holes preset in the box body (1) through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320577208.4U CN219630864U (en) | 2023-03-22 | 2023-03-22 | Waste gas treatment equipment for urea-formaldehyde resin production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320577208.4U CN219630864U (en) | 2023-03-22 | 2023-03-22 | Waste gas treatment equipment for urea-formaldehyde resin production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219630864U true CN219630864U (en) | 2023-09-05 |
Family
ID=87812972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320577208.4U Active CN219630864U (en) | 2023-03-22 | 2023-03-22 | Waste gas treatment equipment for urea-formaldehyde resin production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219630864U (en) |
-
2023
- 2023-03-22 CN CN202320577208.4U patent/CN219630864U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109045902B (en) | Electric automatization spray set | |
| CN215756806U (en) | Deodorizing device for sewage treatment | |
| CN209173745U (en) | One kind being used for the regenerated multilevel cleaning device of denitrating catalyst | |
| CN219630864U (en) | Waste gas treatment equipment for urea-formaldehyde resin production | |
| CN219253018U (en) | Water mist purifying spray booth | |
| CN211537091U (en) | Dust and waste gas treatment device for furniture production workshop | |
| CN210645575U (en) | Industrial waste gas handles and uses filtration purification device | |
| CN209732549U (en) | A grape belt cleaning device for grape wine preparation | |
| CN208960266U (en) | A kind of steel pipe oil-spraying device | |
| CN206549253U (en) | Sewage treatment filter with automatic pollution discharge and cleaning filter-screen function | |
| CN219376623U (en) | Device for waste gas treatment washing tower | |
| CN219149401U (en) | Spiral edulcoration device of sewage treatment | |
| CN220412933U (en) | Experimental river course filter equipment for sewage treatment | |
| CN219722373U (en) | Alkali absorbing device | |
| CN220572753U (en) | Metal surface treating agent waste water treatment equipment | |
| CN214495907U (en) | Multicavity purifier is used in sewage treatment | |
| CN217473556U (en) | Positive resin air scrubbing dynamic regeneration device for hydrogen conductivity measurement | |
| CN217887425U (en) | Washing tower for industrial waste gas purification | |
| CN213610681U (en) | Flue gas treatment device for desulfurization and denitrification of environmental protection engineering | |
| CN218924289U (en) | Waste gas neutralization device | |
| CN216397189U (en) | Herbal pieces-dust collector | |
| CN209077282U (en) | The flip-up style door-plate of oil removing cleaning equipment is sprayed by formula | |
| CN219481812U (en) | Slag discharging device for sewage treatment equipment | |
| CN220900713U (en) | Spraying device | |
| CN214299680U (en) | Odor purification device for sewage treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |