KR20130073290A - Mixer for tire mixing process - Google Patents

Mixer for tire mixing process Download PDF

Info

Publication number
KR20130073290A
KR20130073290A KR1020110141061A KR20110141061A KR20130073290A KR 20130073290 A KR20130073290 A KR 20130073290A KR 1020110141061 A KR1020110141061 A KR 1020110141061A KR 20110141061 A KR20110141061 A KR 20110141061A KR 20130073290 A KR20130073290 A KR 20130073290A
Authority
KR
South Korea
Prior art keywords
mixer
tire
mixing process
mixing
dust collection
Prior art date
Application number
KR1020110141061A
Other languages
Korean (ko)
Other versions
KR101336058B1 (en
Inventor
김동진
Original Assignee
한국타이어 주식회사
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 한국타이어 주식회사 filed Critical 한국타이어 주식회사
Priority to KR1020110141061A priority Critical patent/KR101336058B1/en
Publication of KR20130073290A publication Critical patent/KR20130073290A/en
Application granted granted Critical
Publication of KR101336058B1 publication Critical patent/KR101336058B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PURPOSE: A mixer for a tire mixing process is provided to improve a workplace by improving an efficiency of a dust collection of a mixer body, to secure a product quality by re-injecting a drug to an inside of the mixer, and to save a waste treatment cost by minimizing dust collection amount. CONSTITUTION: A mixer for a tire mixing process comprises the following steps: rubber, all kinds of raw materials, and a drug are put into an inside of a mixing domain (2) through a hopper door (1) opened and closed; and a raw material and a drug sprayed through a dust collection unit (5) connected with an inside of a mixer body (10) are collected, when a rubber and a drug put into by a RAM (4) in which an ascent and a descent operation are made by a cylinder (3) are mixed inside the mixing domain. A mixer for a tire mixing process, in which an ascent and descent cylinder (6) operated by corresponding to an inner pressure of the mixer body in a top of the dust collection unit is installed, comprises an air purge unit (8) connected to an air tank (7) infusing an air to an inside of the dust collection unit.

Description

타이어 혼합 공정용 믹서{Mixer for tire mixing process}Mixer for tire mixing process

본 발명은 타이어 제조에 있어서 첫 번째 공정인 타이어 혼합공정에 이용되는 믹서(Mixer)에 관한 것으로, 특히 믹서 본체의 집진효율 개선과 분진량의 최소화를 통하여 폐기물 처리비용의 절감 등이 이루어지는 타이어 혼합 공정용 믹서에 관한 것이다.The present invention relates to a mixer (Mixer) used in the tire mixing process, which is the first step in tire manufacturing, and particularly, for a tire mixing process in which waste treatment cost is reduced by improving dust collecting efficiency of the mixer body and minimizing dust amount. It's about a mixer.

타이어의 제조공정은 크게 나누어 혼합, 재료, 성형, 가류의 4개의 공정으로 나누며, 이중 혼합공정은 타이어를 제조하는데 있어서 첫 번째 공정으로, 일명 정련공정이라고도 일컫는다.The tire manufacturing process is largely divided into four processes of mixing, material, molding, and vulcanization. The dual mixing process is the first process in manufacturing a tire, also called a refining process.

이러한 타이어 혼합공정은 타이어 제조에 필요한 각종 원료를 혼합해서 타이어에 사용되는 각종의 고무를 배합해 내는 공정으로 믹서(Mixer)라는 설비를 이용해서 배합 사양서에 의거하여 천연고무, 합성고무, 카본블랙(Carbon black), 오일, 기타 화학약품을 적정량씩 계량해 투입해서 믹싱하도록 되어 있다.This tire mixing process is a process of mixing various raw materials required for tire production and mixing various rubbers used for tires. A mixer (Mixer) is used to prepare natural rubber, synthetic rubber, carbon black ( Carbon black), oils, and other chemicals are weighed and mixed in appropriate amounts.

종래 타이어 혼합공정에 이용되는 믹서의 믹싱 사이클(Mixing cycle)시 믹싱영역 내에 투입된 각종 약품 원료들은 램(Ram) 하강 동작에서 믹서 내부에 발생된 내압에 의해 과해진 과압력으로 믹서의 원료 투입구인 호퍼도어 입구의 틈새를 통하여 배출되어진다.In the mixing cycle of the mixer used in the conventional tire mixing process, various chemical raw materials introduced into the mixing zone are hopper, which is a raw material inlet of the mixer, due to the excessive pressure generated by the internal pressure generated inside the mixer during ram lowering operation. It is discharged through a gap in the door entrance.

그러나 이런 경우 이미 계량된 약품에 집진기를 통해 분진으로 배출되어 폐기되고, 그 외의 경우 다음 배치(Batch)에 재투입되지만 어떤 종류의 약품이 얼마만큼 믹서에 재투입되는지 알 수가 없게 되어, 이는 결국 계량장비의 정밀성과는 별개로 믹싱되는 고무품질에 대한 신뢰성 저하와 원자재 손실로 이어지는 경우가 있게 된다.In this case, however, the already weighed drug is discharged as dust through the dust collector and discarded, otherwise it is reloaded into the next batch but it is not known how much of the drug is reloaded into the mixer. Apart from the precision of the equipment, there are cases where it leads to a loss of reliability and loss of raw materials for the quality of the mixed rubber.

이에 본 발명은 상기와 같은 종래 문제점을 해결하기 위해 발명된 것으로, 혼합공정 믹싱 작업시 믹서 외부로 유출되는 약품이나 분진을 최소화하여 작업환경 개선과 분진량의 최소화로 폐기물 처리비용의 절감효과 등이 이루어지는 타이어 혼합 공정용 믹서를 제공함에 그 목적이 있다.Therefore, the present invention has been invented to solve the conventional problems as described above, by minimizing the chemicals and dust flowing out of the mixer during the mixing process mixing work to reduce the waste treatment cost by improving the working environment and minimizing the amount of dust The object is to provide a mixer for a tire mixing process.

상기와 같은 목적을 달성하기 위한 본 발명은 호퍼도어를 통해 투입된 고무와 각종 원료 및 약품이 믹싱영역 내에서 승하강 작용하는 램에 의해 믹싱되고, 이 믹서의 호퍼도어 측면으로 믹서 내부에 연통된 집진부를 구비하여 이루어진 타이어 혼합 공정용 믹서에 있어서, 상기 집진부의 상부에는 램과 반대로 작용하는 승하강 실린더를 갖추면서 이 집진부 내부로 공압을 공급하는 에어 탱크가 에어퍼지 유니트를 매개로 설치되어 있다.In order to achieve the above object, the present invention mixes rubber and various raw materials and chemicals injected through a hopper door by a ram that moves up and down within a mixing area, and a dust collector connected to the inside of the mixer by the hopper door side of the mixer. In the mixer for a tire mixing process comprising: an air tank for supplying air pressure to the inside of the dust collecting unit is provided via an air purge unit, while having a lifting cylinder acting opposite to the ram at the upper portion of the dust collecting unit.

이러한 본 발명에 따른 타이어 혼합 공정용 믹서는 믹서 본체의 집진효율을 향상시키어 작업장의 개선과, 약품을 믹서 내로 재투입하여 제품품질 확보 및, 집진량의 최소화로 폐기물 처리비용 절감 등의 효과를 지닌다.The mixer for a tire mixing process according to the present invention has the effect of improving the dust collecting efficiency of the mixer main body, improving the workplace, and re-introducing the chemical into the mixer to secure product quality and to reduce the waste disposal cost by minimizing the amount of dust collection. .

도 1은 본 발명에 따른 타이어 혼합 공정용 믹서(Mixer)의 전체 구성 정면도,
도 2는 본 발명에 따른 집진부의 작용상태 도면이다.1 is an overall configuration front view of a tire mixing process mixer (Mixer) according to the present invention,
Figure 2 is a state diagram of the dust collector according to the present invention.

이하, 본 발명의 바람직한 실시예를 첨부도면에 의거 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 타이어 혼합 공정용 믹서(Mixer) 전체를 보여주는 도면이다.1 is a view showing the entire mixer (Mixer) for the tire mixing process according to the present invention.

도면에 도시된 바와 같이 본 발명은 개방 폐쇄되는 호퍼도어(1)를 통해 고무와 각종 원료 및 약품이 믹싱영역(2) 내부로 투입되고, 이 믹싱영역(2) 내에서 실린더(3)에 의해 승하강 작용하는 램(4)에 의해 투입된 고무와 약품들이 믹싱될 때 믹서 본체(10)의 내부와 연통된 집진부(5)를 통해 비산되는 원료와 약품을 집진하도록 이루어진 타이어 혼합 공정용 믹서에 있어서, 상기 집진부(5)의 상부에는 믹서 본체의 내부 압력에 대응하여 작용하는 승하강 실린더(6)가 설치되고, 이 집진부(5) 내부로 에어를 불어 넣는 에어탱크(7)에 연결된 에어퍼지 유니트(8)를 구비하여 이루어진 구조로 되어 있다.As shown in the drawing, the present invention introduces rubber and various raw materials and chemicals into the mixing zone 2 through the hopper door 1 that is open and closed, and by the cylinder 3 within the mixing zone 2. In the tire mixing process mixer configured to collect the raw materials and the chemicals scattered through the dust collecting unit 5 in communication with the inside of the mixer main body 10 when the rubber and the chemicals introduced by the ram (4) to move up and down are mixed The upper and lower cylinders 6 and 6 are installed on the dust collector 5 to correspond to the internal pressure of the mixer main body, and the air purge unit connected to the air tank 7 to blow air into the dust collector 5. It has a structure including (8).

그리고 상기 호퍼도어(1)의 테두리에는 믹서 본체(10)와 틈새를 방지하기 위해 실링재가 장착되어 있다.And the rim of the hopper door (1) is equipped with a sealing material to prevent a gap with the mixer main body (10).

이와 같은 본 발명의 작동을 살펴보면, 먼저 믹싱영역(2) 내에 고무와 원료 및 약품 등이 배합 사양서에 의거 계량 투입된 상태에서 호퍼도어(1)를 믹서 본체(10)에 닫게 되면, 이 호퍼도어(10)의 실링재에 의해 믹서 본체(10)와의 틈새가 없게 되어 이 믹서 본체(10)의 내부 분진의 외부 유출을 최소화시킬 수 있다.Referring to the operation of the present invention, when the hopper door 1 is closed on the mixer main body 10 in a state in which rubber, raw materials and chemicals, etc. are metered in the mixing area 2 according to the mixing specification, the hopper door ( There is no gap with the mixer body 10 by the sealing material of 10) to minimize the outflow of the internal dust of the mixer body 10.

이어 공지의 PLC(Programmable Logic Controller)의 지시에 의해 상기 램(4)이 이의 실린더(3)에 의해 하강하게 되면, 이 믹서 본체(10)의 내부 압력이 증가되어 지는데, 이때 상기 집진부(5)의 승하강 실린더(6)는 집진부(5)에서 도 2의 실선위치로 상승하면서 이 믹서 본체(10)의 과압력을 집진부(5)로 흡수하도록 연동 작용하게 된다.Subsequently, when the ram 4 is lowered by the cylinder 3 thereof by the instruction of a known programmable logic controller (PLC), the internal pressure of the mixer main body 10 is increased, at which time the dust collector 5 The raising and lowering cylinder (6) of the ascending action in such a way to absorb the overpressure of the mixer main body (10) to the dust collecting section 5 while rising from the dust collecting section (5) to the solid line position.

이때 상기 집진부(5) 내에서 승하강 실린더(6)의 상승시 이에 연통하여 상기 집진부(5) 내부로 에어탱크(7)이 공기를 에어퍼지 유니트(8)를 통해 불어 넣어 이 집진부(5) 내로 믹서 본체(10)의 압력 흡수할 때 함께 유입된 약품과 원료들을 털어 내어 다시 믹서 본체(10)의 믹싱영역(2)으로 되돌려 보낸다.At this time, when the raising and lowering cylinder (6) in the dust collector 5, the air tank (7) blows air into the dust collector (5) through the air purge unit (8) to the dust collector (5) When absorbing the pressure of the mixer main body 10, the chemicals and the raw materials introduced together are shaken off and returned to the mixing area 2 of the mixer main body 10 again.

한편, 상기 집진부(5)로 유입된 약품과 원료를 털어내는 작용은 상기 믹서 본체(10)의 램(4)이 하강하기 전에 이루어지도록 되어 있다.On the other hand, the action of shaking off the chemicals and the raw materials introduced into the dust collector 5 is to be performed before the ram 4 of the mixer body 10 is lowered.

이 같은 본 발명에 따른 타이어 혼합 공정용 믹서는 믹서 본체에서 작용하는 램(4)의 상승/하강 작용시 집진부(5)의 승하강 실린더(6)가 공지의 PLC의 지시를 받아 반비례 방식으로 연동 작용하여 믹싱영역(2) 내에 작용하는 내부 압력을 조절하고 믹싱 작업시 비산되는 약품이나 원료를 되돌려 보내는 집진 효율 향상과 믹서 본체의 외부로 비산되는 약품과 원료의 비산량을 최소화시킬 수가 있도록 되어 있다.Such a mixer for tire mixing process according to the present invention, when the raising and lowering action of the ram (4) acting on the mixer body, the raising and lowering cylinder (6) of the dust collector (5) is inversely proportional to the direction of a known PLC By controlling the internal pressure acting in the mixing zone (2) to improve the dust collection efficiency to return the chemicals or raw materials scattered during the mixing operation, and to minimize the amount of chemicals and raw materials scattered to the outside of the mixer body.

1 : 호퍼도어(Hopper door), 2 : 믹싱영역(Mixing area),
3 : 실린더, 4 : 램(Ram),
5 : 집진부, 6 : 승하강 실린더,
7 : 에어탱크, 8 : 에어퍼지 유니트(Air purge unit),
10 : 믹서 본체.1: Hopper door, 2: Mixing area,
3: cylinder, 4: ram,
5: dust collecting part, 6: raising and lowering cylinder,
7: air tank, 8: air purge unit,
10: mixer body.

Claims (2)

개방 폐쇄되는 호퍼도어(1)를 통해 고무와 각종 원료 및 약품이 믹싱영역(2) 내부로 투입되고, 이 믹싱영역(2) 내에서 실린더(3)에 의해 승하강 작용하는 램(4)에 의해 투입된 고무와 약품들이 믹싱될 때 믹서 본체(10)의 내부와 연통된 집진부(5)를 통해 비산되는 원료와 약품을 집진하도록 이루어진 타이어 혼합 공정용 믹서에 있어서,
상기 집진부(5)의 상부에는 믹서 본체의 내부 압력에 대응하여 작용하는 승하강 실린더(6)가 설치되고, 이 집진부(5) 내부로 에어를 불어 넣는 에어탱크(7)에 연결된 에어퍼지 유니트(8)를 구비하여 이루어진 것을 특징으로 하는 타이어 혼합 공정용 믹서.Rubber and various raw materials and chemicals are introduced into the mixing zone 2 through the hopper door 1 that is open and closed, and the ram 4 moves up and down by the cylinder 3 within the mixing zone 2. In the tire mixing process mixer configured to collect the raw material and the chemicals scattered through the dust collecting unit 5 in communication with the inside of the mixer body 10 when the rubber and chemicals introduced by the mixing,
An air purge unit 6 is installed at an upper portion of the dust collecting part 5, and is provided with a lifting cylinder 6, which acts in response to the internal pressure of the mixer main body, and is connected to an air tank 7 for blowing air into the dust collecting part 5. 8) Mixer for a tire mixing process, characterized in that consisting of. 제 1항에 있어서,
상기 승하강 실린더(6)는 램(4)과 반비례 방식으로 작동하여 믹싱영역(2) 내의 압력을 흡수되도록 이루어진 것을 특징으로 하는 타이어 혼합 공정용 믹서.The method of claim 1,
The lifting cylinder (6) is a tire mixing process mixer, characterized in that to operate in an inverse manner with the ram (4) to absorb the pressure in the mixing zone (2).
KR1020110141061A 2011-12-23 2011-12-23 Mixer for tire mixing process KR101336058B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110141061A KR101336058B1 (en) 2011-12-23 2011-12-23 Mixer for tire mixing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110141061A KR101336058B1 (en) 2011-12-23 2011-12-23 Mixer for tire mixing process

Publications (2)

Publication Number Publication Date
KR20130073290A true KR20130073290A (en) 2013-07-03
KR101336058B1 KR101336058B1 (en) 2013-12-04

Family

ID=48987779

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110141061A KR101336058B1 (en) 2011-12-23 2011-12-23 Mixer for tire mixing process

Country Status (1)

Country Link
KR (1) KR101336058B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112743693A (en) * 2020-12-18 2021-05-04 益阳橡胶塑料机械集团有限公司 Banbury mixer with dust absorption mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220160843A (en) 2021-05-28 2022-12-06 넥센타이어 주식회사 Raw material input of tire mixing process equipped dust pipe member

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH079436A (en) * 1992-12-28 1995-01-13 Bridgestone Corp Kneading method and compounding chemical recovery device
JP4370081B2 (en) 2002-08-02 2009-11-25 三菱重工業株式会社 Pressure kneader
JP4688635B2 (en) 2005-10-27 2011-05-25 株式会社ブリヂストン Rubber kneading machine
JP5519254B2 (en) 2009-11-27 2014-06-11 株式会社ブリヂストン How to use mixer pressure regulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112743693A (en) * 2020-12-18 2021-05-04 益阳橡胶塑料机械集团有限公司 Banbury mixer with dust absorption mechanism
CN112743693B (en) * 2020-12-18 2022-06-14 益阳橡胶塑料机械集团有限公司 Banbury mixer with dust absorption mechanism

Also Published As

Publication number Publication date
KR101336058B1 (en) 2013-12-04

Similar Documents

Publication Publication Date Title
US8764274B2 (en) Kneading tank inversion discharging sealed pressurized type kneading machine
CN202606122U (en) Dust keeper for feed inlet of reaction tank
CN206633268U (en) Crushing and screening integrated apparatus is used in a kind of plastic waste material processing
CN207271318U (en) A kind of chemical industry milling apparatus
KR101336058B1 (en) Mixer for tire mixing process
CN107907404B (en) Building element resistance to compression experimental apparatus
CN208758007U (en) A kind of screening plant of rubber grain
KR200394402Y1 (en) Recycling device of feed for fish farming
CN103308256B (en) A kind of rubber gasket waterproof performance detector
CN108745868A (en) A kind of screening plant of rubber grain
KR200394401Y1 (en) Recycling device of feed for fish farming
CN210590016U (en) Banbury mixer for producing rubber compound
CN204159090U (en) A kind of plate and frame filter press for silicon rubber quick decolorization
CN107650288A (en) A kind of dust-proof adjusting means that discharged for banburying equipment
CN205517389U (en) Clear blendor of environmental protection
CN106541516A (en) A kind of dual hopper plastic garbage shredder
CN208512383U (en) A kind of powdery industrial detergent production agitating device
CN204841194U (en) Modified sheath after cure recycled water device
CN206351061U (en) A kind of novel mining lithotripsy apparatus
CN206121679U (en) Wet mixing granulator
CN214359155U (en) Airtight feeding device
CN211677635U (en) Benzoic acid feeding treatment system
CN206081994U (en) Device of workshop raise dust is eliminated to concrete
CN204606244U (en) A kind of sealed module equipment of powder packing machine
CN217887504U (en) Reclaimed rubber production dust removal deodorizing device

Legal Events

Date Code Title Description
A201 Request for examination
N231 Notification of change of applicant
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee