CN221693673U - Reaction kettle for producing anti-settling agent - Google Patents

Reaction kettle for producing anti-settling agent Download PDF

Info

Publication number
CN221693673U
CN221693673U CN202420533687.4U CN202420533687U CN221693673U CN 221693673 U CN221693673 U CN 221693673U CN 202420533687 U CN202420533687 U CN 202420533687U CN 221693673 U CN221693673 U CN 221693673U
Authority
CN
China
Prior art keywords
rotating
reaction kettle
frame
mixing
sliding
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
Application number
CN202420533687.4U
Other languages
Chinese (zh)
Inventor
崔晓丽
张新村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Ounuosi Industry And Trade Co ltd
Original Assignee
Qingdao Ounuosi Industry And Trade Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Qingdao Ounuosi Industry And Trade Co ltd filed Critical Qingdao Ounuosi Industry And Trade Co ltd
Priority to CN202420533687.4U priority Critical patent/CN221693673U/en
Application granted granted Critical
Publication of CN221693673U publication Critical patent/CN221693673U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/141Feedstock

Landscapes

  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)

Abstract

The utility model discloses a reaction kettle for producing an anti-settling agent, which relates to the technical field of reaction kettles and solves the technical problems that after auxiliary materials are filled, the auxiliary materials are floated and accumulated at the top of liquid, so that fusion is not facilitated, and secondly, the stirring efficiency is low only through a single mixing rotating plate in the reaction kettle, so that the production speed is influenced by filling a large amount of liquid; the device comprises a support frame, wherein a supporting support plate and two switching frames are fixedly arranged in the support frame, the two switching frames and the supporting support plate are positioned on the same vertical surface, and a reaction kettle body is rotatably sleeved between the two switching frames; the utility model drives the reaction kettle body to rotate in the opposite direction, so that the mixing of the anti-settling agent in the reaction kettle body is faster, the production efficiency of the mixing of the anti-settling agent is accelerated, the injected raw materials are fully fused, the low floating and melting efficiency of the raw materials is avoided, and the reduction of the melting and mixing efficiency of the anti-settling agent is easily caused.

Description

Reaction kettle for producing anti-settling agent
Technical Field
The utility model relates to the technical field of reaction kettles, in particular to a reaction kettle for producing an anti-settling agent.
Background
The reaction kettle is widely understood to be a container with physical or chemical reaction, and the heating, evaporating, cooling and low-speed and high-speed mixing functions required by the process are realized through structural design and parameter configuration of the container; according to the reaction kettle provided by the Chinese patent grant publication No. CN220003998U, after auxiliary materials enter the material surface inside the reaction kettle body from the auxiliary material feeding pipe, the telescopic driving motor drives the rotary driving motor A and the pressing plate to move towards the material direction until the pressing plate contacts with the material, and after the telescopic driving motor continues to drive the pressing plate to move downwards for a set distance, the rotary driving motor A drives the pressing plate to rotate back and forth, so that the condition that the auxiliary materials stay on the material surface for a long time is avoided, the reaction time is shortened, and the production efficiency is improved; however, after filling auxiliary materials, the auxiliary materials are floated and accumulated at the top of the liquid, so that the fusion is not facilitated, and the stirring efficiency is low only through a single mixing rotating plate in the reaction kettle, so that the production speed is influenced by filling a large amount of liquid;
Therefore, a reaction kettle for producing an anti-settling agent is designed to solve the problems.
Disclosure of utility model
The utility model provides a reaction kettle for producing an anti-settling agent, which solves the technical problems that after auxiliary materials are filled, the auxiliary materials are floated and accumulated at the top of liquid, so that fusion is not facilitated, and the stirring efficiency is low only through a single mixing rotating plate in the reaction kettle, so that the production speed is influenced by filling a large amount of liquid.
In order to solve the technical problems, the reaction kettle for producing the anti-settling agent comprises a support frame, wherein a supporting support plate and two adapter brackets are fixedly arranged in the support frame, the two adapter brackets and the supporting support plate are positioned on the same vertical surface, a reaction kettle body is rotatably sleeved between the two adapter brackets, the bottom of the reaction kettle body is fixedly connected with a discharge valve, one side of the support frame is fixedly provided with a support plate, a reaction mixing assembly is arranged outside the reaction kettle body, and a feeding blending assembly is arranged outside the supporting support plate.
Preferably, the reaction mixing assembly comprises a rotating shaft barrel, a mixing rotating rod, a first rotating plate, an outer motor frame, a first driving motor, a big fluted disc, a second driving motor and a small fluted disc, wherein the two rotating shaft barrels are fixedly sleeved in the reaction kettle body, the two rotating shaft barrels are rotatably sleeved with the mixing rotating rod, the mixing rotating rod is fixedly sleeved with a plurality of first rotating plates, the plurality of first rotating plates are uniformly distributed outside the mixing rotating rod at equal intervals, the top of a supporting plate is fixedly provided with the outer motor frame, the first driving motor is fixedly arranged in the outer motor frame, the output end of the first driving motor is fixedly connected with the top end of the mixing rotating rod, the big fluted disc is fixedly sleeved in the outer portion of the reaction kettle body, the second driving motor is fixedly arranged at the bottom of the supporting plate, the small fluted disc is fixedly sleeved in the output end of the second driving motor, and the outer wall of the big fluted disc is connected with the outer wall of the small fluted disc in a meshed mode.
Preferably, the outside of reation kettle body has fixedly cup jointed four limit sleeve boards, every the outer wall of limit sleeve board all contacts with corresponding switching frame.
Preferably, the feeding blending component comprises a sliding rotating frame, a second rotating plate, sliding cylinders, a transmission clamping plate, a lifting ring plate, servo hydraulic cylinders and lifting frames, wherein the two sliding cylinders are movably sleeved outside the mixing rotating rod, the sliding rotating frame is fixedly sleeved between the sliding cylinders, a plurality of second rotating plates are fixedly arranged on the outer wall of the sliding rotating frame, a plurality of second rotating plates are uniformly distributed on the outer wall of the sliding rotating frame at equal distances, the transmission clamping plate is fixedly arranged on the outer wall of the mixing rotating rod, the sliding rotating frame is in sliding sleeve joint with the transmission clamping plate, the lifting ring plate is rotatably sleeved outside the sliding rotating frame, the lifting frames are fixedly sleeved on two sides of the lifting ring plate, the servo hydraulic cylinders are fixedly arranged at the top of the motor outer frame, and the hydraulic struts inside the servo hydraulic cylinders are fixedly sleeved with the lifting frames.
Preferably, the outside of slip revolving rack is fixed to be cup jointed two locating plates, two the outer wall of locating plate all contacts with the outer wall of lifting ring board.
Preferably, the top of backup pad fixed mounting has cup joints the outer case, cup joints the outer case and cup joints with the fluted disc mutually.
Compared with the related art, the reaction kettle for producing the anti-settling agent has the following beneficial effects:
The utility model provides a reaction kettle for producing an anti-settling agent, which is characterized in that a reaction kettle body is rotatably supported through a transfer frame in a supporting frame, a mixing rotating rod is rotatably supported through two rotating shaft cylinders in the reaction kettle body, a plurality of first rotating plates are fixedly arranged outside the mixing rotating rod, a supporting support plate is fixedly arranged in the supporting frame in a matched manner, a first driving motor is fixedly arranged at the top of the supporting frame, the output end of the driving motor is fixedly connected with the top end of the mixing rotating rod to drive the first rotating plates outside the mixing rotating rod to rotate, a large fluted disc is fixedly sleeved outside the reaction kettle body in a matched manner, and a supporting plate is fixedly arranged at one side of the supporting frame, so that a small fluted disc at the output end of the second driving motor is fixedly supported with the large fluted disc in a meshed manner, and the reaction kettle body is driven to rotate in the opposite direction, so that the mixing of the anti-settling agent in the reaction kettle body is faster, and the production efficiency of the mixing of the anti-settling agent is accelerated; through cup jointing the slip revolving rack in the outside activity of mixing the bull stick, secondly, outer wall fixed mounting at mixing the bull stick has the transmission cardboard, make transmission cardboard and slip revolving rack slip cup joint, and then when rotating mixing the bull stick, can drive the outside second revolving plate of slip revolving rack and rotate, the cooperation has cup jointed the promotion crown block in the outside rotation of slip revolving rack, the cooperation has cup jointed the hoisting frame in the outside fixed of promotion crown block again, secondly, the top fixed mounting at the motor outer frame has servo hydraulic cylinder, make the inside hydraulic prop of servo hydraulic cylinder cup joint with the hoisting frame is fixed, and then can go up and down the adjustment with adjusting a plurality of second revolving plate, realize can fully fuse the raw materials of filling, avoid the raw materials to float and melt inefficiency, and then cause the melting mixing efficiency reduction of anti-setting agent easily.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic cross-sectional view of the present utility model;
FIG. 3 is a schematic view of the structure of the present utility model in partial section in FIG. 2;
FIG. 4 is an enlarged schematic view of the structure of FIG. 2A according to the present utility model;
FIG. 5 is an enlarged schematic view of the structure of FIG. 2B according to the present utility model;
fig. 6 is an enlarged schematic view of the structure of fig. 3C according to the present utility model.
Reference numerals in the drawings: 1. a support frame; 2. carrying a support plate; 3. a transfer frame; 4. a reaction kettle body; 5. a limiting sleeve plate; 6. a reaction mixing assembly; 601. a rotating shaft cylinder; 602. a mixing rod; 603. a first rotating plate; 604. an outer frame of the motor; 605. a first driving motor; 606. a large fluted disc; 607. a second driving motor; 608. a small fluted disc; 7. a discharge valve; 8. a support plate; 9. a feeding blending component; 901. sliding the rotating frame; 902. a second rotating plate; 903. a slide cylinder; 904. a transmission clamping plate; 905. lifting the annular plate; 906. a servo hydraulic cylinder; 907. a lifting frame; 10. sleeving an outer box; 11. and (5) positioning the plate.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model; 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.
The first embodiment is shown in fig. 1-6, the utility model comprises a support frame 1, a supporting support plate 2 and two switching frames 3 are fixedly arranged in the support frame 1, the two switching frames 3 and the supporting support plate 2 are positioned on the same vertical surface, a reaction kettle body 4 is rotatably sleeved between the two switching frames 3, the bottom of the reaction kettle body 4 is fixedly connected with a discharge valve 7, a support plate 8 is fixedly arranged on one side of the support frame 1, a reaction mixing component 6 is arranged outside the reaction kettle body 4, and a feeding blending component 9 is arranged outside the supporting support plate 2.
In the second embodiment, based on the first embodiment, the reaction mixing assembly 6 includes a rotating shaft cylinder 601, a mixing rotating rod 602, a first rotating plate 603, a motor outer frame 604, a first driving motor 605, a big fluted disc 606, a second driving motor 607 and a small fluted disc 608, two rotating shaft cylinders 601 are fixedly sleeved in the inner part of the reaction kettle body 4, the mixing rotating rod 602 is rotatably sleeved between the two rotating shaft cylinders 601, a plurality of first rotating plates 603 are fixedly sleeved on the mixing rotating rod 602, a plurality of first rotating plates 603 are uniformly distributed on the outer part of the mixing rotating rod 602, the top of the supporting plate 2 is fixedly provided with the motor outer frame 604, the first driving motor 605 is fixedly arranged in the motor outer frame 604, the output end of the first driving motor 605 is fixedly connected with the top of the mixing rotating rod 602, the big fluted disc 606 is fixedly sleeved in the outer part of the reaction kettle body 4, the second driving motor 607 is fixedly sleeved in the bottom of the supporting plate 8, the output end of the second driving motor 607 is fixedly sleeved with the small fluted disc 608, and the outer wall of the big fluted disc 606 is meshed with the outer wall of the small fluted disc 608, so that the mixing efficiency of the anti-sedimentation agent inside the reaction kettle body 4 is accelerated.
Embodiment three, on the basis of embodiment one, four spacing sleeve plates 5 have been cup jointed to the outside fixed of reation kettle body 4, and the outer wall of every spacing sleeve plate 5 all contacts with corresponding switching frame 3, and then can carry out switching support to reation kettle body 4, prevents to appear the problem that reation kettle body 4 dropped at the mixing in-process.
In the fourth embodiment, based on the second embodiment, the feeding blending assembly 9 comprises a sliding rotating frame 901, a second rotating plate 902, sliding cylinders 903, a transmission clamping plate 904, a lifting ring plate 905, a servo hydraulic cylinder 906 and a lifting frame 907, two sliding cylinders 903 are movably sleeved outside the mixing rotating rod 602, the sliding rotating frame 901 is fixedly sleeved between the two sliding cylinders 903, a plurality of second rotating plates 902 are fixedly arranged on the outer wall of the sliding rotating frame 901, a plurality of second rotating plates 902 are uniformly distributed on the outer wall of the sliding rotating frame 901, the transmission clamping plate 904 is fixedly arranged on the outer wall of the mixing rotating rod 602, the sliding rotating frame 901 is in sliding sleeve connection with the transmission clamping plate 904, a lifting ring plate 905 is rotatably sleeved outside the sliding rotating frame 901, lifting frames 907 are fixedly sleeved on two sides of the lifting ring plate 905, a servo hydraulic cylinder 906 is fixedly arranged at the top of the outer frame 604 of the motor, and hydraulic struts inside the servo hydraulic cylinder 906 are fixedly sleeved with the lifting frames 907, so that the filled raw materials can be fully mixed, the raw materials are prevented from being melted, and the melting efficiency of the raw materials is easy to be lowered, and the lowering of the melting efficiency of the anti-precipitation agent is easy to cause.
In the fifth embodiment, on the basis of the fourth embodiment, two positioning plates 11 are fixedly sleeved on the outside of the sliding turret 901, and the outer walls of the two positioning plates 11 are in contact with the outer wall of the lifting annular plate 905, so that the lifting annular plate 905 is subjected to position limitation, and falling off in the lifting process is avoided.
In the sixth embodiment, on the basis of the second embodiment, the top of the supporting plate 8 is fixedly provided with a sleeving outer box 10, and the sleeving outer box 10 is sleeved with the small fluted disc 608, so that the small fluted disc 608 can be protected.
Working principle: firstly, through fixedly mounting two adapter brackets 3 in the support frame 1 to further rotationally support the reaction kettle body 4, secondly, fixedly sleeving two limit sleeve plates 5 on the outer part of the reaction kettle body 4 to further prevent the reaction kettle body 4 from falling off when rotationally supporting the reaction kettle body 4, fixedly mounting two rotating shaft cylinders 601 on the inner part of the reaction kettle body 4 to further rotationally support the mixed rotating rod 602, secondly, fixedly mounting a first rotating plate 603 on the outer part of the mixed rotating rod 602, fixedly mounting a bearing support plate 2 on the inner part of the support frame 1 and fixedly mounting a first driving motor 605 on the top of the bearing support plate, so that the output end of the driving motor 605 is fixedly connected with the top of the mixed rotating rod 602 to drive the first rotating plate 603 on the outer part of the mixed rotating rod 602 to rotate, and fixedly sleeving a large fluted disc 606 on the outer part of the reaction kettle body 4, and secondly, fixedly mounting a support plate 8 on one side of the support frame 1 to fixedly support the second driving motor, and enabling the small fluted disc 608 on the output end of the second driving motor to be meshed with the large fluted disc 606, so as to drive the reaction kettle body 4 to rotate in the opposite direction, thereby speeding up the production of the anti-settling agent; through having cup jointed two slide drums 903 in the outside activity of mixing bull stick 602, and then having cup jointed the slip revolving rack 901 in the slip, secondly, fixedly installed transmission cardboard 904 in the outer wall of mixing bull stick 602, make transmission cardboard 904 and slip revolving rack 901 slide and cup joint, and then when rotating mixing bull stick 602, can drive the outside second revolving plate 902 of slip revolving rack 901 and rotate, the cooperation has cup jointed the promotion annular plate 905 in the outside rotation of slip revolving rack 901, and make two locating plates 11 and the contact of promotion annular plate 905 of slip revolving rack 901 outside, the cooperation has cup jointed the promotion frame 907 in the outside fixed of promotion annular plate 905, and extend to the outside of reation kettle body 4, secondly, fixedly cup jointed motor outer frame 604 in the outside of first driving motor 605, and then carry out fixed support to servo pneumatic cylinder 906, and make the inside hydraulic prop of servo pneumatic cylinder 906 and the fixed cup joint of promotion frame 907, and then can carry out the lift adjustment with adjusting a plurality of second revolving plate 902, realize that the raw materials of filling can fully fuse, avoid the raw materials to float to melt the inefficiency, and then cause the mixed efficiency reduction of anti-settling agent easily.
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. The utility model provides an anti-precipitant production is with reation kettle, includes support frame (1), its characterized in that: the inside fixed mounting of support frame (1) has and accepts extension board (2) and two switching frame (3), two switching frame (3) are located same vertical face with accepting extension board (2), two it has cup jointed reation kettle body (4) to rotate between switching frame (3), the bottom fixedly connected with exhaust valve (7) of reation kettle body (4), one side fixed mounting of support frame (1) has backup pad (8), the outside of reation kettle body (4) is equipped with reaction mixing assembly (6), the outside of accepting extension board (2) is equipped with pan feeding and reconciles subassembly (9).
2. The reaction kettle for producing the anti-settling agent according to claim 1, wherein the reaction mixing component (6) comprises a rotating shaft cylinder (601), a mixing rotating rod (602), a first rotating plate (603), a motor outer frame (604), a first driving motor (605), a big fluted disc (606), a second driving motor (607) and a small fluted disc (608), two rotating shaft cylinders (601) are fixedly sleeved in the reaction kettle body (4), the mixing rotating rod (602) is rotatably sleeved between the two rotating shaft cylinders (601), a plurality of first rotating plates (603) are fixedly sleeved on the mixing rotating rod (602), a plurality of first rotating plates (603) are distributed outside the mixing rotating rod (602) at equal distances, a motor outer frame (604) is fixedly installed at the top of the supporting support supporting plate (2), a first driving motor (605) is fixedly installed inside the motor outer frame (604), the output end of the first driving motor (605) is fixedly connected with the top end of the mixing rotating rod (602), a second fluted disc (608) is fixedly sleeved on the outer side of the reaction kettle body (4), a second driving fluted disc (606) is fixedly sleeved on the bottom of the second driving fluted disc (8), the outer wall of the big fluted disc (606) is meshed with the outer wall of the small fluted disc (608).
3. The reaction kettle for producing the anti-settling agent according to claim 1, wherein four limit sleeve plates (5) are fixedly sleeved outside the reaction kettle body (4), and the outer wall of each limit sleeve plate (5) is contacted with a corresponding adapter bracket (3).
4. The reaction kettle for producing the anti-settling agent according to claim 2, wherein the feeding blending component (9) comprises a sliding rotating frame (901), a second rotating plate (902), sliding drums (903), a transmission clamping plate (904), a lifting ring plate (905), servo hydraulic cylinders (906) and lifting frames (907), two sliding drums (903) are movably sleeved outside the mixing rotating rod (602), the sliding rotating frame (901) is fixedly sleeved between the two sliding drums (903), a plurality of second rotating plates (902) are fixedly arranged on the outer wall of the sliding rotating frame (901), a plurality of second rotating plates (902) are uniformly distributed on the outer wall of the sliding rotating frame (901), the transmission clamping plate (904) is fixedly arranged on the outer wall of the mixing rotating rod (602), the sliding rotating frame (901) is in sliding sleeve joint with the transmission clamping plate (904), lifting ring plates (905) are rotatably sleeved outside the sliding rotating frames, lifting motors (907) are fixedly sleeved on the two sides of the lifting ring plates (905), and hydraulic cylinders (906) are fixedly sleeved on the inner sides of the outer rotating frame (604).
5. The reaction kettle for producing an anti-settling agent according to claim 4, wherein two positioning plates (11) are fixedly sleeved outside the sliding rotary frame (901), and the outer walls of the two positioning plates (11) are contacted with the outer wall of a lifting annular plate (905).
6. The reaction kettle for producing the anti-settling agent according to claim 2, wherein a sleeving outer box (10) is fixedly arranged at the top of the supporting plate (8), and the sleeving outer box (10) is sleeved with the small fluted disc (608).
CN202420533687.4U 2024-03-19 2024-03-19 Reaction kettle for producing anti-settling agent Active CN221693673U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202420533687.4U CN221693673U (en) 2024-03-19 2024-03-19 Reaction kettle for producing anti-settling agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202420533687.4U CN221693673U (en) 2024-03-19 2024-03-19 Reaction kettle for producing anti-settling agent

Publications (1)

Publication Number Publication Date
CN221693673U true CN221693673U (en) 2024-09-13

Family

ID=92656080

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202420533687.4U Active CN221693673U (en) 2024-03-19 2024-03-19 Reaction kettle for producing anti-settling agent

Country Status (1)

Country Link
CN (1) CN221693673U (en)

Similar Documents

Publication Publication Date Title
CN110887384B (en) Smelting furnace with automatic stirring assembly for aluminum product processing
CN112775646A (en) Special assembly platform for special-shaped non-planar parts
CN221693673U (en) Reaction kettle for producing anti-settling agent
CN110773036A (en) Automatic feeding hydraulic lifting beating machine and beating method thereof
CN216510795U (en) High-angle climbing fermented grain lifting device
CN211586172U (en) Automatic material loading hydraulic lifting beating machine
CN214690867U (en) Bonding mud storage bucket for ceramic
CN209733421U (en) Inclined adjustable jacketed kettle
CN111702950B (en) Concrete mixing device is used in hydraulic engineering construction
CN211466866U (en) Jun porcelain production is with gypsum mould slip casting device
CN209733422U (en) Stirring lifting type jacketed kettle
CN208292272U (en) Autoclave trolley rotating device
CN219238662U (en) Automatic butt joint device for material rack and skip car
CN213493435U (en) Double-tank dispersion machine
CN117443244B (en) Preparation device of environment-friendly low-temperature modified crack pouring adhesive and operation method thereof
CN220071532U (en) Charging basket type cooling stirring device
CN220696437U (en) Planetary mixer with temperature control function
CN213842768U (en) Demulsifier production sampling device
CN219599975U (en) Mixing stirring device
CN219186589U (en) Stirred tank is used in coating production
CN220900272U (en) Vacuum homogenizing emulsifying device
CN220663040U (en) Large barrel butyl rubber filling device
CN219879646U (en) Mixer is used in production of UV coating
CN216661399U (en) Automatic discharging machine
CN217257144U (en) Auxiliary processing device for producing aluminum silicon carbide bricks

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant