CN107378715A - A kind of construction site reinforcing bar derusting dolly - Google Patents

A kind of construction site reinforcing bar derusting dolly Download PDF

Info

Publication number
CN107378715A
CN107378715A CN201710664976.2A CN201710664976A CN107378715A CN 107378715 A CN107378715 A CN 107378715A CN 201710664976 A CN201710664976 A CN 201710664976A CN 107378715 A CN107378715 A CN 107378715A
Authority
CN
China
Prior art keywords
derusting
reinforcing bar
layer
polishing
cleaning
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.)
Pending
Application number
CN201710664976.2A
Other languages
Chinese (zh)
Inventor
伍超群
Original Assignee
伍超群
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 伍超群 filed Critical 伍超群
Priority to CN201710664976.2A priority Critical patent/CN107378715A/en
Publication of CN107378715A publication Critical patent/CN107378715A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/033Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02Cleaning by the force of jets or sprays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/02Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/12Devices for exhausting mist of oil or coolant; Devices for collecting or recovering materials resulting from grinding or polishing, e.g. of precious metals, precious stones, diamonds or the like
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements

Abstract

The invention discloses a kind of construction site reinforcing bar derusting dolly, including base, derusting bucket and driving gear;The inside of the derusting bucket is disposed with polishing layer, cleaning layer and baking zone along reinforcing bar feedstock direction;The polishing layer is circular ring structure, and the internal symmetry for layer of polishing is provided with four chutes, and the internal slide of chute is provided with connecting rod, and one end of connecting rod is fixedly connected by spring with the inwall for layer of polishing, and the other end of connecting rod is rotatablely equipped with polishing ball;The cleaning layer is also circular ring structure, and the centre position of cleaning layer is provided with cleaning disk.Derusting bucket in derusting dolly provided by the invention is provided with polishing layer, cleaning layer and baking zone, is not only simple in structure, and easy to use, easy to carry and transport, effectively reinforcing bar can also be polished, cleaned and be dried, and derust excellent effect.

Description

A kind of construction site reinforcing bar derusting dolly
Technical field
The present invention relates to Architectural Equipment technical field, specifically a kind of construction site reinforcing bar derusting dolly.
Background technology
Reinforcing bar is a kind of bar of steel, is one kind of construction material.Such as among armored concrete, for supporting The skeleton of structure.Including plain bar, Ribbed Bar, twisted bar.Bar types are a lot, generally according to chemical composition, produce work Skill, rolling profile, supply form, diameter, and purposes in the structure are classified.Reinforcing bar is mainly held in concrete Tension stress.Deformed bar can preferably bear external force because the effect of rib, and concrete have larger cementitiousness Effect.Reinforcing bar is widely used in various building structure, particularly large-scale, heavy, light thin wall and high building structure.
For reinforcing bar in long-term place, its surface easily produces substantial amounts of iron rust, influences the use of reinforcing bar;Existing reinforcing bar removes Rust is typically derusted using manual polishing or using rust remover, and not only labour cost is higher for manual polishing, and wastes time and energy, And existing rust remover average physique is larger, transport inconvenience, it is unfavorable for the reinforcing bar derusting of job site.
The content of the invention
It is an object of the invention to provide a kind of construction site reinforcing bar derusting dolly, to solve to carry in above-mentioned background technology The problem of going out.
To achieve the above object, the present invention provides following technical scheme:
A kind of construction site reinforcing bar derusting dolly, including base, derusting bucket and driving gear;Front and rear the two of the base Side is symmetrically installed with two first supports, and the front and rear sides of the derusting bucket are symmetrically installed with first rotating shaft and the second rotating shaft, the One rotating shaft and the second rotating shaft are rotatably installed in two first supports respectively;The driving gear is rotatablely installed by second support On base, positioned at the right side of derusting bucket, the outside of the derusting bucket is also installed with mutually nibbles driving gear with driving gear The gear ring of conjunction;The first rotating shaft is the hollow structure of left end opening, and second rotating shaft is the hollow structure of right-end openings;Institute The inside for stating derusting bucket is disposed with polishing layer, cleaning layer and baking zone along reinforcing bar feedstock direction;The polishing layer is annulus Structure, and the internal symmetry for layer of polishing is provided with four chutes, the internal slide of chute is provided with connecting rod, one end of connecting rod It is fixedly connected by spring with the inwall for layer of polishing, the other end of connecting rod is rotatablely equipped with polishing ball;The interior of layer of polishing Portion is additionally provided with the slug collection chamber of ring-type, and slug collection chamber uniformly offers some charging holes close to the side of polishing ball;Institute It is also circular ring structure, and the centre position of cleaning layer is provided with cleaning disk to state cleaning layer;It is described cleaning disk and cleaning layer it Between be disposed with waste collection chamber and cleaning fluid storage chamber from the inside to surface, the waste collection chamber is uniform close to the side of shower nozzle It is provided with some inlet openings.
As the further scheme of the present invention:The driving electricity for driving driving gear to rotate also is installed with the base Machine.
As further scheme of the invention:The inner side of the cleaning disk is uniformly provided with some shower nozzles.
As further scheme of the invention:The inside of the cleaning fluid storage chamber is installed with water pump, water pump Delivery port connects with sprinkling disk.
As further scheme of the invention:Filling opening is additionally provided with the upside of the cleaning fluid storage chamber.
As further scheme of the invention:The baking zone is also circular ring structure, and the inner side of baking zone is fixedly mounted There is heating ring.
Compared with prior art, the beneficial effects of the invention are as follows:Derusting bucket in derusting dolly provided by the invention is set There are polishing layer, cleaning layer and baking zone, be not only simple in structure, and it is easy to use, it is easy to carry and transport, can also be effectively Reinforcing bar is polished, cleaned and dried, derust excellent effect.
Brief description of the drawings
Fig. 1 is the structural representation of construction site reinforcing bar derusting dolly.
Fig. 2 is the top view of construction site reinforcing bar derusting dolly.
Fig. 3 is the test chart of construction site reinforcing bar derusting dolly.
Fig. 4 is the structural representation of polishing layer in construction site reinforcing bar derusting dolly.
Fig. 5 is the structural representation of cleaning layer in construction site reinforcing bar derusting dolly.
Fig. 6 is the structural representation of baking zone in construction site reinforcing bar derusting dolly.
In figure:1- bases, 2- first supports, 3- derusting bucket, 4- gear rings, 5- driving gears, 6- second supports, 7- castors, 8- polishings layer, 9- cleaning layers, 10- baking zones, 11- motors, 12- first rotating shafts, the rotating shafts of 13- second, 14- springs, 15- are slided Groove, 16- connecting rods, 17- polishings ball, 18- slug collections chamber, 19- charging holes, 20- sprinklings disk, 21- waste collections chamber, 22- Cleaning fluid storage chamber, 23- inlet openings, 24- shower nozzles, 25- water pumps, 26- heating rings.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
Refer to Fig. 1~6, in the embodiment of the present invention, a kind of construction site is derusted dolly, including base 1, derusting with reinforcing bar Bucket 3 and driving gear 5;The front and rear sides of the base 1 are symmetrically installed with two first supports 2, and front and rear the two of the derusting bucket 3 Side is symmetrically installed with the rotating shaft 13 of first rotating shaft 12 and second, and the rotating shaft 13 of first rotating shaft 12 and second is rotatably installed in two respectively On one support 2, derusting bucket 3 can rotate in first support 2;The driving gear 5 is rotatably installed in base by second support 6 On 1, positioned at the right side of derusting bucket 3, the outside of the derusting bucket 3 is also installed with to be meshed driving gear 5 with driving gear 5 Gear ring 4;The motor 11 for driving driving gear 5 to rotate also is installed with the base 1, motor 11 drives master Moving gear 5 rotates, so as to drive derusting bucket 3 to rotate;The first rotating shaft 12 be left end opening hollow structure, described second turn Axle 13 is the hollow structure of right-end openings, and reinforcing bar enters the inside of derusting bucket 3 from first rotating shaft 12, from second turn after the completion of derusting Axle 13 takes out;The inside of the derusting bucket 3 is disposed with polishing layer 8, cleaning layer 9 and baking zone 10 along reinforcing bar feedstock direction, To be polished reinforcing bar, cleaned and to be dried;The polishing layer 8 is circular ring structure, and the internal symmetry for layer 8 of polishing is provided with Four chutes 15, the internal slide of chute 15 are provided with connecting rod 16, and one end of connecting rod 16 passes through spring 14 and polishing layer 8 Inwall is fixedly connected, and the other end of connecting rod 16 is rotatablely equipped with polishing ball 17, and the reinforcing bar that spring 14 can make diameter different is close to Polishing ball 17, to improve polishing effect;The inside of the polishing layer 8 is additionally provided with the slug collection chamber 18 of ring-type, and scrap is received Collection chamber 18 uniformly offers some charging holes 19 close to the side of polishing ball 17, to be received to scrap caused by polishing Collection;The cleaning layer 9 is also circular ring structure, and the centre position of cleaning layer 9 is provided with cleaning disk 20, cleans the interior of disk 20 Side is uniformly provided with some shower nozzles 24, to be cleaned to the reinforcing bar after polishing;Between the cleaning disk 20 and cleaning layer 9 Waste collection chamber 21 and cleaning fluid storage chamber 22 are disposed with from the inside to surface, and the waste collection chamber 21 is close to the one of shower nozzle 24 Side is evenly arranged with some inlet openings 23, to be collected to the waste liquid after cleaning, the inside of the cleaning fluid storage chamber 22 Water pump 25 is installed with, the delivery port of water pump 25 is connected with sprinkling disk 20, carried out so as to which cleaning fluid is pumped into sprinkling disk 20 Sprinkling;The upside of the cleaning fluid storage chamber 22 is additionally provided with filling opening, so as to the supplement of cleaning fluid;The baking zone 10 is also Circular ring structure, and the inner side of baking zone 10 is installed with heating ring 26, to be dried to the reinforcing bar after cleaning, prevents two It is secondary to get rusty.
The present invention operation principle be:Construction site reinforcing bar derusting dolly, dolly is shifted onto reinforcing bar to be derusted Near, start motor 11 and water pump 25, and one of reinforcing bar is inserted in first rotating shaft 12, hence into derusting bucket 3 Inside, the reinforcing bar into derusting bucket 3 initially enter polishing layer 8, and connecting rod 16 is under action from the spring 14 close to polishing ball 17 Rebar surface, derusting dolly is promoted, polishing ball 17 carries out polishing derusting to rebar surface, and scrap caused by polishing falls into scrap It is collected in collecting chamber 18, at the same time, motor 11 drives driving gear 5 to rotate, so as to drive derusting bucket 3 to rotate, Reinforcing bar is set to obtain comprehensive polishing;Enter after the completion of reinforcing bar polishing in cleaning layer 9, cleaning fluid will be pumped into sprinkling disk by water pump 25 The reinforcing bar after polishing spray in 20, the waste liquid after cleaning is flowed into waste collection chamber, and at the same time, derust bucket 3 Rotation reinforcing bar is obtained comprehensive cleaning;The reinforcing bar that cleaning is completed enters in baking zone 10, and the inner side of baking zone 10 adds Hot ring 26 is dried to reinforcing bar, and due to the rotation for the bucket 3 that derusts, reinforcing bar quickly just complete by drying;Polishing, cleaning and drying are completed Reinforcing bar afterwards takes out from the second rotating shaft 13, continues to press on dolly, then reinforcing bar is derusted.
Derusting bucket in derusting dolly provided by the invention is provided with polishing layer, cleaning layer and baking zone, not only structure letter It is single and easy to use, it is easy to carry and transport, effectively reinforcing bar can also be polished, cleaned and be dried, derust effect It is excellent.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling Change is included in the present invention.Any reference in claim should not be considered as to the involved claim of limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art It is appreciated that other embodiment.

Claims (6)

1. a kind of construction site reinforcing bar derusting dolly, it is characterised in that including base (1), derusting bucket (3) and driving gear (5);The front and rear sides of the base (1) are symmetrically installed with two first supports (2), the front and rear sides pair of the derusting bucket (3) Title is provided with first rotating shaft (12) and the second rotating shaft (13), and first rotating shaft (12) and the second rotating shaft (13) are rotatably installed in two respectively On individual first support (2);The driving gear (5) is rotatably installed on base (1) by second support (6), driving gear (5) Positioned at the right side of derusting bucket (3), the outside of the derusting bucket (3) is also installed with the gear ring being meshed with driving gear (5) (4);The first rotating shaft (12) is the hollow structure of left end opening, and second rotating shaft (13) is the hollow knot of right-end openings Structure;The inside of the derusting bucket (3) is disposed with polishing layer (8), cleaning layer (9) and baking zone along reinforcing bar feedstock direction (10);The polishing layer (8) is circular ring structure, and the internal symmetry for layer (8) of polishing is provided with four chutes (15), chute (15) Internal slide connecting rod (16) is installed, one end of connecting rod (16) is fixed by the inwall of spring (14) and polishing layer (8) Connection, the other end of connecting rod (16) are rotatablely equipped with polishing ball (17);The inside of the polishing layer (8) is additionally provided with ring-type Slug collection chamber (18), slug collection chamber (18) uniformly offer some charging holes (19) close to the side of polishing ball (17);Institute It is also circular ring structure to state cleaning layer (9), and the centre position of cleaning layer (9) is provided with cleaning disk (20);The cleaning disk (20) waste collection chamber (21) and cleaning fluid storage chamber (22) are disposed with from the inside to surface between cleaning layer (9), it is described useless Liquid collecting chamber (21) is evenly arranged with some inlet openings (23) close to the side of shower nozzle (24).
2. construction site according to claim 1 reinforcing bar derusting dolly, it is characterised in that also solid on the base (1) Dingan County is equipped with the motor (11) for driving driving gear (5) to rotate.
3. construction site according to claim 1 reinforcing bar derusting dolly, it is characterised in that the cleaning disk (20) Inner side is uniformly provided with some shower nozzles (24).
4. construction site according to claim 1 reinforcing bar derusting dolly, it is characterised in that the cleaning fluid storage chamber (22) inside is installed with water pump (25), and the delivery port of water pump (25) connects with sprinkling disk (20).
5. construction site according to claim 1 reinforcing bar derusting dolly, it is characterised in that the cleaning fluid storage chamber (22) filling opening is additionally provided with the upside of.
6. construction site according to claim 1 is derusted dolly with reinforcing bar, it is characterised in that the baking zone (10) is also Circular ring structure, heating ring (26) is installed with the inside of baking zone (10).
CN201710664976.2A 2017-08-07 2017-08-07 A kind of construction site reinforcing bar derusting dolly Pending CN107378715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710664976.2A CN107378715A (en) 2017-08-07 2017-08-07 A kind of construction site reinforcing bar derusting dolly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710664976.2A CN107378715A (en) 2017-08-07 2017-08-07 A kind of construction site reinforcing bar derusting dolly

Publications (1)

Publication Number Publication Date
CN107378715A true CN107378715A (en) 2017-11-24

Family

ID=60344444

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710664976.2A Pending CN107378715A (en) 2017-08-07 2017-08-07 A kind of construction site reinforcing bar derusting dolly

Country Status (1)

Country Link
CN (1) CN107378715A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108214247A (en) * 2018-01-02 2018-06-29 山东思创机器人科技有限公司 A kind of welding seams of round pipe automatically grinding device
CN108789003A (en) * 2018-06-12 2018-11-13 安徽机电职业技术学院 Burr finishing device at a kind of pipe fitting welding
CN110653707A (en) * 2019-09-25 2020-01-07 时守东 Adjustable construction steel bar rust removal device
CN110893580A (en) * 2019-11-18 2020-03-20 刘一漩 Reinforcing bar device of flare-outing for building machinery
CN111113232A (en) * 2019-12-30 2020-05-08 湖北立晋钢铁集团有限公司 Screw-thread steel grinding device with locating component
CN111300243A (en) * 2020-03-26 2020-06-19 孙开祺 Rust removal device for automobile spring production and use method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201324998Y (en) * 2008-12-29 2009-10-14 大连三高重工设备有限公司 Steel pipe deruster
CN102151638A (en) * 2011-03-21 2011-08-17 贾韶强 Semi-automatic derusting and paint spraying device for surface of metal tube and derusting and paint spraying method thereof
CN203003654U (en) * 2012-12-17 2013-06-19 中冶天工集团有限公司 Hand-push-type large structure deruster
CN203292990U (en) * 2013-04-28 2013-11-20 上海聚东新能源科技有限公司 Handcart type derusting grinding machine for steel plate
CN203525982U (en) * 2013-11-01 2014-04-09 徐州兴旗机械制造有限公司 Derusting and painting integrated machine for steel pipe
CN206732757U (en) * 2017-03-24 2017-12-12 成都铁塔厂 A kind of safety-type steel rust removing device easy to remove

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201324998Y (en) * 2008-12-29 2009-10-14 大连三高重工设备有限公司 Steel pipe deruster
CN102151638A (en) * 2011-03-21 2011-08-17 贾韶强 Semi-automatic derusting and paint spraying device for surface of metal tube and derusting and paint spraying method thereof
CN203003654U (en) * 2012-12-17 2013-06-19 中冶天工集团有限公司 Hand-push-type large structure deruster
CN203292990U (en) * 2013-04-28 2013-11-20 上海聚东新能源科技有限公司 Handcart type derusting grinding machine for steel plate
CN203525982U (en) * 2013-11-01 2014-04-09 徐州兴旗机械制造有限公司 Derusting and painting integrated machine for steel pipe
CN206732757U (en) * 2017-03-24 2017-12-12 成都铁塔厂 A kind of safety-type steel rust removing device easy to remove

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108214247A (en) * 2018-01-02 2018-06-29 山东思创机器人科技有限公司 A kind of welding seams of round pipe automatically grinding device
CN108789003A (en) * 2018-06-12 2018-11-13 安徽机电职业技术学院 Burr finishing device at a kind of pipe fitting welding
CN110653707A (en) * 2019-09-25 2020-01-07 时守东 Adjustable construction steel bar rust removal device
CN110893580A (en) * 2019-11-18 2020-03-20 刘一漩 Reinforcing bar device of flare-outing for building machinery
CN111113232A (en) * 2019-12-30 2020-05-08 湖北立晋钢铁集团有限公司 Screw-thread steel grinding device with locating component
CN111300243A (en) * 2020-03-26 2020-06-19 孙开祺 Rust removal device for automobile spring production and use method thereof

Similar Documents

Publication Publication Date Title
CN106239332A (en) A kind of oil pipeline inwall processing intelligence cleans rust removalling equipment
CN107119890A (en) A kind of building wall brushing vehicle
CN107630547A (en) A kind of wall plastering device with liquid self-feeding function
CN108837980A (en) A kind of outer wall of steel pipe oiling station
CN206512987U (en) A kind of wall plastering equipment for construction
CN107283243A (en) A kind of integrated sanding apparatus of the artificial stone for being used to build
CN206689894U (en) A kind of pipe fitting device for grinding outer wall
CN204262073U (en) Cold rolled tube outer surface greasy dirt rotates scavenge unit online
CN207245110U (en) A kind of building wall brushing vehicle
CN105257214B (en) A kind of construction soil layer drilling equipment
CN206216030U (en) It is a kind of with the construction and decoration cutting machine for being switched fast tool function
CN107084085B (en) A kind of micro hydraulic turbine easy to remove
CN108590132B (en) Automatic paint spraying machine
CN105952118B (en) A kind of intelligent painting machine people for interior architecture wall decoration
CN105971253B (en) It is a kind of to build white washed wall robot from steady lift
CN107780628A (en) A kind of inner wall of building flour brush device
CN207479128U (en) A kind of two-sided cleaning device of municipal works pipeline
CN108160624A (en) A kind of adjustable building steel tube cleaning device of internal diameter
CN205735672U (en) A kind of plastic crushing retracting device carrying rinsing equipment
CN207363226U (en) A kind of construction pours car with concrete floor
CN106522836A (en) High-stability drilling device for building foundation construction
CN105195777A (en) Multi-angle steel plate drilling device
CN206736367U (en) A kind of copper wire tin-plating cleaning device
CN108080172A (en) A kind of trunk whitewashing device with aeration agitation function
CN208792709U (en) A kind of finishing metope coating apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20171124

RJ01 Rejection of invention patent application after publication