Patents-Review.com
ClassID:

39240 ⎘

B21K1/22 - CPC Classification

Classification description:

Making machine elements valve parts poppet valves, e.g. for internal-combustion engines

Recent Application in this class:
#1
20230167755
2023-06-01

ENGINE VALVE AND MANUFACTURING METHOD THEREFOR

 #2
20220403761
2022-12-22

Method and device for manufacturing hollow, internally cooled valves

 #3
20220168798
2022-06-02

Method for producing a hollow valve for internal combustion engines

 #4
20220152690
2022-05-19

Method for producing a hollow valve for internal combustion engines

 #5
20220034243
2022-02-03

Engine valve with raised ring or dimple

 #6
20210370376
2021-12-02

Method for producing a hollow valve for internal combustion engines

 #7
20210270154
2021-09-02

Method for manufacturing engine poppet valve

 #8
20210199029
2021-07-01

Method for producing a hollow valve with an optimised interior stem geometry for internal combustion engines

 #9
20210190212
2021-06-24

Hollow poppet valve and manufacturing method therefor

 #10
20210180480
2021-06-17

Engine valve with raised ring or dimple

 #11
20210180479
2021-06-17

Poppet valve

 #12
20200347756
2020-11-05

Internally cooled valve for an internal combustion engine

 #13
20200308998
2020-10-01

Poppet valve for internal combustion engine

 #14
20200156144
2020-05-21

Method for the production of hollow chamber valves

 #15
20200149442
2020-05-14

PROCESS FOR MANUFACTURNIG AN INTERNALLY COOLED VALVE HAVING A COOLING STRUCTURE, AND VALVE MANUFACTURED BY SAID METHOD

 #16
20200095907
2020-03-26

Hollow engine valve and manufacturing method therefor

 #17
20200049033
2020-02-13

VALVE TIMING CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

 #18
20190030595
2019-01-31

Method for filling with metallic sodium

 #19
20180313238
2018-11-01

Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve

 #20
20180304344
2018-10-25

INTERNALLY COOLED VALVE FOR INTERNAL COMBUSTION ENGINES, AS WELL AS METHOD AND DEVICE FOR THE PRODUCTION THEREOF

 #21
20180104776
2018-04-19

Precision forming method of high-efficiency and near-net hollow valve blank of engine

 #22
20170276032
2017-09-28

Engine valve and method of producing the same

 #23
20170276031
2017-09-28

Method for supplying inert gas into poppet valve intermediate and apparatus for supplying inert gas into poppet valve intermediate

 #24
20170234175
2017-08-17

Hollow engine valve and manufacturing method therefor

 #25
20170211434
2017-07-27

Poppet valve and method for manufacturing same

 #26
20170122146
2017-05-04

Combustion engine intake valve

 #27
20160356186
2016-12-08

Hollow poppet valve

 #28
20160279746
2016-09-29

Method of charging a hollow valve with metallic sodium

 #29
20160273417
2016-09-22

Valve timing control device for internal combustion engine

 #30
20160256965
2016-09-08

Method of manufacturing a hollow poppet valve

 #31
20150354727
2015-12-10

Hollow poppet valve

 #32
20150300506
2015-10-22

Poppet valve with a formed seat, and method of making

 #33
20150266084
2015-09-24

Bar material transfer method and conveyor

 #34
20150240675
2015-08-27

Hollow poppet valve

 #35
20140366373
2014-12-18

Method for producing a hollow engine valve

 #36
20140352803
2014-12-04

Hollow poppet valve

 #37
20140352385
2014-12-04

APPARATUS FOR PRODUCING A HOLLOW POPPET VALVE

 #38
20140345354
2014-11-27

Engine valve forging system

 #39
20140283384
2014-09-25

Method of manufacturing a valve for an internal combustion engine

 #40
20140191150
2014-07-10

Poppet valve with a formed seat, and method of making

 #41
20140041222
2014-02-13

Method for manufacturing valve train parts using metal powder injection molding

 #42
20140033533
2014-02-06

Method for manufacturing hollow engine valve

 #43
20140033532
2014-02-06

Method for production of valve head portion of hollow engine valve and hollow engine valve

 #44
20130313463
2013-11-28

Method for production of valve head portion of hollow engine valve and hollow engine valve

 #45
20130047433
2013-02-28

METHOD OF PRODUCING A HOLLOW POPPET VALVE AND AN APPARATUS THEREFOR

 #46
20130019474
2013-01-24

Method for producing engine valve in which sodium metal is sealed

 #47
20120304464
2012-12-06

METHOD FOR MANUFACTURING HOLLOW ENGINE VALVE

 #48
20120255175
2012-10-11

Method for producing hollow engine valve

 #49
20120246934
2012-10-04

Method for producing metallic-sodium-filled engine valve

 #50
20120228538
2012-09-13

Method for manufacturing valve umbrella portion of hollow engine valve, press device of valve umbrella portion of hollow engine valve, and hollow engine valve

 #51
20110186000
2011-08-04

Hollow poppet valve and method of manufacturing the same

 #52
20110174259
2011-07-21

Method for production of valve head portion of hollow engine valve and hollow engine valve

 #53
20110126791
2011-06-02

Exhaust poppet valve and solution heat treatment method of the same

 #54
20090293275
2009-12-03

Intake valve structure and method of manufacture

 #55
20090094830
2009-04-16

Valve for Controlling Gas Exchange, Especially in Internal Combustion Engines

 #56
20080006793
2008-01-10

Valve for Controlling Gas Exchange, Especially in Internal Combustion Engines

 #57
20070277911
2007-12-06

Surface modifying jig of engine valve and surface modifying method employing it

 #58
20070145322
2007-06-28

Lightweight valve

 #59
20070068477
2007-03-29

Engine valve, method of manufacturing same, and cylinder head incorporating same

 #60
20060157171
2006-07-20

Heat resistant alloy for exhaust valves durable at 900°C and exhaust valves made of the alloy