CN219664198U - Coating compounding machine for producing silicon-coated preservative paper - Google Patents

Coating compounding machine for producing silicon-coated preservative paper Download PDF

Info

Publication number
CN219664198U
CN219664198U CN202321246158.8U CN202321246158U CN219664198U CN 219664198 U CN219664198 U CN 219664198U CN 202321246158 U CN202321246158 U CN 202321246158U CN 219664198 U CN219664198 U CN 219664198U
Authority
CN
China
Prior art keywords
fixedly connected
bottom plate
coating
motor
preservative paper
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
CN202321246158.8U
Other languages
Chinese (zh)
Inventor
王桂红
姜会启
黄媛芳
周锡存
柏海
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.)
Zhejiang Xianlu New Materials Co ltd
Original Assignee
Zhejiang Xianlu New Materials 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 Zhejiang Xianlu New Materials Co ltd filed Critical Zhejiang Xianlu New Materials Co ltd
Priority to CN202321246158.8U priority Critical patent/CN219664198U/en
Application granted granted Critical
Publication of CN219664198U publication Critical patent/CN219664198U/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
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Paper (AREA)

Abstract

The utility model discloses a coating compound machine for producing silicon-coated preservative paper, which relates to the technical field of preservative paper production and comprises a bottom plate, a drying assembly, a spraying assembly and a translation assembly; the upper end of the bottom plate is provided with a mounting groove; the drying component is arranged at the front side of the upper end of the bottom plate; the translation component is arranged on the upper side of the bottom plate; the spraying subassembly contains motor, absorption chamber, turbofan, output tube, input tube and falls the shell of making an uproar, the upper end right side fixedly connected with of bottom plate falls the shell of making an uproar, fall the front end fixedly connected with motor of shell of making an uproar, the output shaft of motor extends to the rear end fixedly connected with turbofan of falling the shell of making an uproar, fall the inside of shell of making an uproar and be equipped with the absorption chamber, the inside of absorption chamber is equipped with the runner, can scribble the silicon to the preservative paper through the spraying subassembly to guarantee the performance of preservative paper, guarantee the roughness of scribbling the silicon through translation subassembly, the rethread stoving subassembly dries the preservative paper.

Description

Coating compounding machine for producing silicon-coated preservative paper
Technical Field
The utility model relates to the technical field of preservative paper production, in particular to a coating compound machine for producing silicon-coated preservative paper.
Background
The preservative paper is generally manufactured by adopting a coating compound machine, the coating compound machine is widely used for coating and compounding packaging materials of frozen foods, dry foods, medicines and daily necessities, and can also be used for compounding aluminum foil glass paper polyamide and other films with smooth surfaces with polyethylene, polypropylene and other films, glue is coated on the compound paper by the existing coating compound machine through a glue outlet, then two pieces of compound paper are pressed together by a pressing roller, the glue is spread out by extrusion, in order to ensure that the glue can completely cover the compound paper, the glue is usually excessive, and excessive glue flows out from two sides of the compound paper during extrusion, so that the glue is wasted, and therefore, the coating compound machine for producing the grape preservative paper is provided.
Wherein, the processing time of the preservative paper in the prior art is longer, and the operation is troublesome, which affects the working efficiency.
Disclosure of Invention
The utility model aims to overcome the existing defects, and provides the coating compound machine for producing the silicon-coated preservative paper, which can coat silicon on the preservative paper through a spraying assembly, so that the performance of the preservative paper is ensured, the flatness of the silicon coating is ensured through a translation assembly, and the preservative paper is dried through a drying assembly, so that the problems in the background technology can be effectively solved.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a coating compound machine for producing silicon-coated preservative paper comprises a bottom plate, a drying component, a spraying component and a translation component;
a bottom plate: the upper end is provided with a mounting groove;
and (3) a drying assembly: the front side of the upper end of the bottom plate is provided with a plurality of grooves;
and a translation assembly: the bottom plate is arranged on the upper side of the bottom plate;
and (3) spraying an assembly: contain motor, absorption chamber, turbofan, output tube, input tube and fall the shell of making an uproar, the upper end right side fixedly connected with of bottom plate falls the shell of making an uproar, the front end fixedly connected with motor of falling the shell of making an uproar, the output shaft of motor extends to the rear end fixedly connected with turbofan of falling the shell of making an uproar, the inside of falling the shell of making an uproar is equipped with the absorption chamber, the inside of absorbing the chamber is equipped with the runner, the right-hand member fixedly connected with input tube of runner, the right-hand member fixedly connected with output tube of runner, the output tube extends to the top of the cotton piece of coating in the translation subassembly, the input of motor passes through the output electricity of outside control switch group and external power source and is connected, and the output shaft rotates after the motor switch-on makes the turbofan rotate to make the inside barometric pressure that produces of absorption chamber, makes silica gel water can be transmitted to the cotton piece of coating through the output tube, thereby can scribble the silicon to fresh-keeping paper.
Further, stoving subassembly contains air-blower, heating cabinet, heating wire and pipe, the upper end front side of bottom plate is equipped with the heating cabinet, the inside of heating cabinet is equipped with the heating wire, the right-hand member fixedly connected with air-blower of heating cabinet, the output of air-blower extends to the inside of heating cabinet, the one end of the front end fixedly connected with pipe of heating cabinet, the input of air-blower passes through outside control switch group and is connected with external power supply's output electricity, and the inside heating wire of heating cabinet can heat the air, can pass through the pipe transmission to the stoving case with hot air after the air-blower switch-on.
Further, the stoving subassembly still contains stoving case and venthole, the left end fixedly connected with stoving case of bottom plate, the venthole has been seted up to the upper end of stoving case, the other end of pipe extends to the bottom of heating cabinet, and the stoving case can be through venthole exhaust hot air to can carry out quick air-drying to the preservative paper after scribbling the silicon, accelerate work efficiency.
Further, translation subassembly contains motor two, landing leg, threaded rod, connecting plate, slide bar and bracing piece, the upper end left side fixedly connected with motor two of bottom plate, the output shaft of motor two extends to the right-hand member fixedly connected with threaded rod of landing leg, both sides fixedly connected with two bracing pieces around the upper end middle part of bottom plate, the left end rotation of the bracing piece of rear end is connected with the threaded rod, fixedly connected with slide bar between bracing piece and the landing leg, slide bar periphery side sliding connection has the connecting plate, the side screw threaded connection of the connecting plate of rear end has the threaded rod, the front end of the lower extreme fixedly connected with output tube of connecting plate, the output shaft rotates after the motor two switch-on power to make the threaded rod rotate to make the connecting plate slide along the slide bar, thereby can drive the output tube constantly remove, evenly scribble the silicon to the surface of preservative paper.
Further, translation subassembly still contains tensioning roller and lower tensioning roller, and the bottom rotation between two bracing pieces is connected with two pivots, and the pivot periphery side fixedly connected with of upper end goes up the tensioning roller, and the pivot periphery side fixedly connected with of lower extreme is tensioning roller down, goes up tensioning roller and lower tensioning roller and is used for flattening the preservative paper, guarantees scribbles the normal clear of silicon.
Further, translation subassembly still contains collecting roller, spliced pole, pulley, spout and coating cotton piece, both sides are equipped with the curb plate respectively around the bottom plate, the side of curb plate is equipped with the spout, the inside roll connection of spout has the pulley, fixedly connected with spliced pole between two pulleys, the middle part periphery side of spliced pole rotates and is connected with collecting roller, the lower extreme fixedly connected with coating cotton piece of output tube, collecting roller can carry out the rolling with the preservative paper after the stoving of scribbling the silicon, and the coating cotton piece can scribble the silicon to the preservative paper surface.
Compared with the prior art, the utility model has the beneficial effects that: the coating compound machine for producing the silicon-coated preservative paper has the following advantages:
1. this scribble silicon preservative paper production with coating compounding machine has set up the spraying subassembly, and the output shaft rotates and makes the turbofan rotate after the motor switch-on power to make the absorption intracavity portion produce atmospheric pressure, make silica gel water can pass through output tube transmission to the cotton piece of coating, thereby can scribble the silicon to preservative paper.
2. This scribble silicon preservative paper production with coating compounding machine has set up stoving subassembly, and heating wire inside the heating cabinet can be to air heating, can pass through the pipe with hot air after the air-blower switch-on and transmit to the stoving case, and the stoving case can be through venthole exhaust hot air to can carry out quick air-drying to the preservative paper after scribbling the silicon, accelerate work efficiency.
3. This scribble coating compounding machine for production of silicon preservative paper has set up translation subassembly, and output shaft rotates and makes the threaded rod rotate after the second switch-on power to make the connecting plate slide along the slide bar, thereby can drive the output tube and constantly remove, evenly scribble the silicon to the surface of preservative paper, collect the roller and can carry out the rolling with the preservative paper after scribbling the silicon stoving, scribble the cotton piece of coating and can scribble the silicon to the preservative paper surface.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of a partial enlarged structure of the portion A in FIG. 1 according to the present utility model;
FIG. 3 is a schematic view of the rear cross-sectional structure of the present utility model.
In the figure: 1 a bottom plate, 2 a drying component, 21 a blower, 22 a heating box, 23 electric heating wires, 24 a conduit, 25 a drying box, 26 air outlets, 3 a spraying component, 31 a motor, 32 an absorption cavity, 33 a turbofan, 34 an output pipe, 35 an input pipe, 36 a noise reduction shell, 4 a translation component, 41 a motor II, 42 a supporting leg, 43 a threaded rod, 44 a connecting plate, 45 a sliding rod, 46 an upper tensioning roller, 47 a lower tensioning roller, 48 a supporting rod, 49 a collecting roller, 410 a connecting column, 411 a pulley, 412 a sliding groove and 413 a coated cotton block.
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.
Referring to fig. 1-3, the present embodiment provides a technical solution: a coating compound machine for producing silicon-coated preservative paper comprises a bottom plate 1, a drying component 2, a spraying component 3 and a translation component 4;
the base plate 1: the upper end is provided with a mounting groove;
drying assembly 2: is arranged at the front side of the upper end of the bottom plate 1; the drying component 2 comprises a blower 21, a heating box 22, an electric heating wire 23 and a conduit 24, wherein the heating box 22 is arranged on the front side of the upper end of the bottom plate 1, the electric heating wire 23 is arranged in the heating box 22, the blower 21 is fixedly connected to the right end of the heating box 22, the output end of the blower 21 extends to the inside of the heating box 22, the front end of the heating box 22 is fixedly connected with one end of the conduit 24, the input end of the blower 21 is electrically connected with the output end of an external power supply through an external control switch group, the electric heating wire 23 in the heating box 22 can heat air, and the air can be transmitted to the drying box 25 through the conduit 24 after the blower 21 is powered on.
The drying assembly 2 further comprises a drying box 25 and an air outlet hole 26, the left end of the bottom plate 1 is fixedly connected with the drying box 25, the air outlet hole 26 is formed in the upper end of the drying box 25, the other end of the guide pipe 24 extends to the bottom end of the heating box 22, and the drying box 25 can exhaust hot air through the air outlet hole 26, so that fresh-keeping paper coated with silicon can be rapidly air-dried, and the working efficiency is accelerated.
Translation assembly 4: is arranged on the upper side of the bottom plate 1; the translation assembly 4 comprises a motor II 41, a supporting leg 42, a threaded rod 43, a connecting plate 44, a sliding rod 45 and a supporting rod 48, wherein the motor II 41 is fixedly connected to the left side of the upper end of the bottom plate 1, the threaded rod 43 is fixedly connected to the right end of the supporting leg 42 through an output shaft of the motor II 41, two supporting rods 48 are fixedly connected to the front side and the rear side of the upper end of the bottom plate 1, the threaded rod 43 is rotatably connected to the left end of the supporting rod 48 at the rear end, the sliding rod 45 is fixedly connected between the supporting rod 48 and the supporting leg 42, the connecting plate 44 is slidably connected to the periphery of the sliding rod 45, the threaded rod 43 is screwed to the side end screw hole of the connecting plate 44 at the rear end, the lower end of the connecting plate 44 is fixedly connected to the front end of the output tube 34, the input end of the motor II 41 is electrically connected to the output end of an external power supply through an external control switch group, the output shaft rotates after the motor II 41 is connected to enable the threaded rod 43 to rotate, so that the connecting plate 44 slides along the sliding rod 45, and the output tube 34 can be driven to continuously move, and the surface of preservative paper can be uniformly coated with silicon.
The translation subassembly 4 still contains tensioning roller 46 and lower tensioning roller 47, and the bottom rotation between two bracing pieces 48 is connected with two pivots, and the pivot periphery side fixedly connected with of upper end goes up tensioning roller 46, and the pivot periphery side fixedly connected with of lower extreme is tensioning roller 47 down, goes up tensioning roller 46 and tensioning roller 47 down and is used for flattening the preservative paper, guarantees scribbling the normal clear of silicon.
Translation subassembly 4 still contains collection roller 49, spliced pole 410, pulley 411, spout 412 and coating cotton piece 413, both sides are equipped with the curb plate respectively around bottom plate 1, the side of curb plate is equipped with spout 412, the inside roll connection of spout 412 has pulley 411, fixedly connected with spliced pole 410 between two pulleys 411, the middle part periphery side rotation of spliced pole 410 is connected with collection roller 49, the lower extreme fixed connection coating cotton piece 413 of output tube 34, collection roller 49 can carry out the rolling with the preservative paper after the silicon drying, coating cotton piece 413 can carry out the silicon to the preservative paper surface.
Spray assembly 3: the device comprises a motor 31, an absorption cavity 32, a turbofan 33, an output pipe 34, an input pipe 35 and a noise reduction shell 36, wherein the noise reduction shell 36 is fixedly connected to the right side of the upper end of a bottom plate 1, the motor 31 is fixedly connected to the front end of the noise reduction shell 36, the output shaft of the motor 31 extends to the rear end of the noise reduction shell 36 and is fixedly connected with the turbofan 33, the absorption cavity 32 is arranged in the noise reduction shell 36, a runner is arranged in the absorption cavity 32, the right end of the runner is fixedly connected with the input pipe 35, the right end of the runner is fixedly connected with the output pipe 34, the output pipe 34 extends to the top end of a coating cotton block 413 in a translation assembly 4, the input end of the motor 31 is electrically connected with the output end of an external power supply through an external control switch group, and the output shaft rotates after the motor 31 is connected with the power supply to enable the turbofan 33 to rotate, so that air pressure is generated in the absorption cavity 32, silica gel water can be transmitted to the coating cotton block 413 through the output pipe 34, and the coating cotton block can be coated with silicon.
The utility model provides a coating compound machine for producing silicon-coated preservative paper, which has the following working principle: the output shaft rotates to enable the turbofan 33 to rotate after the motor 31 is connected with a power supply, so that air pressure is generated in the absorption cavity 32, silica gel water can be transmitted to the coating cotton block 413 through the output pipe 34, so that the fresh-keeping paper can be coated with silicon, the heating wire 23 in the heating box 22 can heat the air, the hot air can be transmitted to the drying box 25 through the guide pipe 24 after the blower 21 is connected with the power supply, the drying box 25 can discharge the hot air through the air outlet hole 26, the fresh-keeping paper after the silicon coating can be rapidly dried, the working efficiency is improved, the output shaft rotates to enable the threaded rod 43 to rotate after the motor 41 is connected with the power supply, the connecting plate 44 slides along the sliding rod 45, the output pipe 34 can be driven to continuously move, the surface of the fresh-keeping paper can be uniformly coated with silicon, the collecting roller 49 can wind the fresh-keeping paper after the silicon coating drying, and the surface of the fresh-keeping paper can be coated with silicon by the coating cotton block 413.
It should be noted that the core chip of the external control switch group disclosed in the above embodiment is selected from a STM32 series single-chip microcomputer, the specific model is an MP151 single-chip microcomputer, the motor 31 is a Y100L-2 ac asynchronous motor, the motor two 41 is a Y90L-6 ac asynchronous motor, the blower 21 is a roots blower, and the external control switch group controls the motor 31, the motor two 41 and the blower 21 to work by methods commonly used in the prior art.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (6)

1. A coating compounding machine for producing silicon-coated preservative paper is characterized in that: comprises a bottom plate (1), a drying component (2), a spraying component (3) and a translation component (4);
bottom plate (1): the upper end is provided with a mounting groove;
drying component (2): is arranged at the front side of the upper end of the bottom plate (1);
translation assembly (4): is arranged on the upper side of the bottom plate (1);
spray assembly (3): contain motor (31), absorption chamber (32), turbofan (33), output tube (34), input tube (35) and fall shell (36) of making an uproar, the upper end right side fixedly connected with of bottom plate (1) falls shell (36) of making an uproar, the front end fixedly connected with motor (31) of falling shell (36), the output shaft of motor (31) extends to the rear end fixedly connected with turbofan (33) of falling shell (36), the inside of falling shell (36) is equipped with absorption chamber (32), the inside of absorption chamber (32) is equipped with the runner, the right-hand member fixedly connected with input tube (35) of runner, the right-hand member fixedly connected with output tube (34) of runner, the output tube (34) extends to the top of coating cotton piece (413) in translation subassembly (4), the input of motor (31) is through outside control switch group and external power source's output electricity connection.
2. The coating and compounding machine for producing silicon-coated preservative paper according to claim 1, wherein the coating and compounding machine is characterized in that: drying component (2) contain air-blower (21), heating cabinet (22), heating wire (23) and pipe (24), the upper end front side of bottom plate (1) is equipped with heating cabinet (22), the inside of heating cabinet (22) is equipped with heating wire (23), the right-hand member fixedly connected with air-blower (21) of heating cabinet (22), the output of air-blower (21) extends to the inside of heating cabinet (22), the one end of front end fixedly connected with pipe (24) of heating cabinet (22), the input of air-blower (21) is connected with external power source's output electricity through external control switch group.
3. The coating and compounding machine for producing silicon-coated preservative paper according to claim 2, which is characterized in that: the drying assembly (2) further comprises a drying box (25) and an air outlet hole (26), the left end of the bottom plate (1) is fixedly connected with the drying box (25), the air outlet hole (26) is formed in the upper end of the drying box (25), and the other end of the guide pipe (24) extends to the bottom end of the heating box (22).
4. The coating and compounding machine for producing silicon-coated preservative paper according to claim 1, wherein the coating and compounding machine is characterized in that: the translation subassembly (4) contains motor two (41), landing leg (42), threaded rod (43), connecting plate (44) and slide bar (45), the upper end left side fixedly connected with motor two (41) of bottom plate (1), the output shaft of motor two (41) is prolonged to the right-hand member fixedly connected with threaded rod (43) of landing leg (42), both sides fixedly connected with two bracing pieces (48) around the upper end middle part of bottom plate (1), the left end rotation of bracing piece (48) of rear end is connected with threaded rod (43), fixedly connected with slide bar (45) between bracing piece (48) and landing leg (42), slide connection plate (44) are slided to slide bar (45) periphery, the side screw threaded connection of connecting plate (44) of rear end has threaded rod (43), the front end of lower extreme fixedly connected with output tube (34) of connecting plate (44), the input of motor two (41) is through outside control switch group and external power source's output electricity.
5. The coating and compounding machine for producing silicon-coated preservative paper according to claim 4, wherein: the translation assembly (4) further comprises an upper tensioning roller (46) and a lower tensioning roller (47), two rotating shafts are rotatably connected to the bottom ends between the two supporting rods (48), the upper tensioning roller (46) is fixedly connected to the outer peripheral side of the rotating shaft at the upper end, and the lower tensioning roller (47) is fixedly connected to the outer peripheral side of the rotating shaft at the lower end.
6. The coating and compounding machine for producing silicon-coated preservative paper according to claim 4, wherein: the translation subassembly (4) still contains collection roller (49), spliced pole (410), pulley (411), spout (412) and coating cotton piece (413), both sides are equipped with the curb plate respectively around bottom plate (1), the side of curb plate is equipped with spout (412), the inside roll connection of spout (412) has pulley (411), fixedly connected with spliced pole (410) between two pulleys (411), the middle part periphery side rotation of spliced pole (410) is connected with collection roller (49), the lower extreme fixed connection coating cotton piece (413) of output tube (34).
CN202321246158.8U 2023-05-23 2023-05-23 Coating compounding machine for producing silicon-coated preservative paper Active CN219664198U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321246158.8U CN219664198U (en) 2023-05-23 2023-05-23 Coating compounding machine for producing silicon-coated preservative paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321246158.8U CN219664198U (en) 2023-05-23 2023-05-23 Coating compounding machine for producing silicon-coated preservative paper

Publications (1)

Publication Number Publication Date
CN219664198U true CN219664198U (en) 2023-09-12

Family

ID=87899408

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202321246158.8U Active CN219664198U (en) 2023-05-23 2023-05-23 Coating compounding machine for producing silicon-coated preservative paper

Country Status (1)

Country Link
CN (1) CN219664198U (en)

Similar Documents

Publication Publication Date Title
CN208271664U (en) A kind of cable drying equipment of high-efficiency environment friendly
CN213943771U (en) Gluing device for processing conductive aluminum foil adhesive tape
CN208714491U (en) Film covering device is used in a kind of compound aluminum veneer production
CN219664198U (en) Coating compounding machine for producing silicon-coated preservative paper
CN214089224U (en) Drying and pressing equipment for special paper processing
CN207299828U (en) A kind of drying equipment for paper honeycomb
CN217005239U (en) Baking device for processing photoelectric film
CN207540310U (en) A kind of chemical fiber wire colouring drying unit
CN213179280U (en) Drying device for gauze production
CN213147288U (en) Drying device in wallpaper processing process
CN209555597U (en) A kind of garment production dryer
CN207839955U (en) Cable Assembly system
CN218238263U (en) Improved generation drying device in corrugated paper production
CN219913826U (en) Paper tube dryer
CN221016820U (en) Paint spraying device based on wind power tower production
CN219160853U (en) Dryer for noodle production
CN208124813U (en) A kind of Packaging Box preheating cylinder
CN219342704U (en) Bubbling elimination assembly for paper manufacture
CN217324746U (en) Energy-saving laminating machine
CN216245376U (en) Cable drying device
CN216368781U (en) Furniture decorative paper gluing oven
CN218296473U (en) Two-sided drying equipment is used in plastic film production
CN218583694U (en) Cloth drying device is used in production based on thing networking
CN213873662U (en) Drying device in electronic component machining process
CN219489864U (en) Glass heating and drying device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant