CA2018968A1 - Exhaust valve - Google Patents
Exhaust valveInfo
- Publication number
- CA2018968A1 CA2018968A1 CA 2018968 CA2018968A CA2018968A1 CA 2018968 A1 CA2018968 A1 CA 2018968A1 CA 2018968 CA2018968 CA 2018968 CA 2018968 A CA2018968 A CA 2018968A CA 2018968 A1 CA2018968 A1 CA 2018968A1
- Authority
- CA
- Canada
- Prior art keywords
- rod
- valve
- sleeve
- valve element
- valve seat
- 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.)
- Abandoned
Links
Landscapes
- Lift Valve (AREA)
Abstract
TITLE
EXHAUST VALVE
APPLICANT
KOCKUMS MARINE AB
INVENTOR
Sven Erik Roland OLSSON
ABSTRACT
An exhaust valve that is suitable for use in co-operation with an internal combustion engine located in a submarine, has a valve seat formed therein and a valve element movable in the housing and supporting the valve element for movement between an open and a closed position and including a supporting device comprising a preferably cylindrical sleeve and a rod which axially displaces, in said sleeve between an upper and lower position, the rod extending out of the sleeve toward the valve element and being connected at its protruding end with a valve element for transmitting axial as well as rotational movement of the rod and wherein the rod and sleeve are provided with mutually co-operating rims in grooves adapted to impart the rotational movement to the rod during axial displacement of the rod in the sleeve and to inmpart to the valve element, a rotational movement relative to the valve seat before the valve element during opening, is lifted away from the valve seat and on closing, has been brought into engagement with the valve seat.
EXHAUST VALVE
APPLICANT
KOCKUMS MARINE AB
INVENTOR
Sven Erik Roland OLSSON
ABSTRACT
An exhaust valve that is suitable for use in co-operation with an internal combustion engine located in a submarine, has a valve seat formed therein and a valve element movable in the housing and supporting the valve element for movement between an open and a closed position and including a supporting device comprising a preferably cylindrical sleeve and a rod which axially displaces, in said sleeve between an upper and lower position, the rod extending out of the sleeve toward the valve element and being connected at its protruding end with a valve element for transmitting axial as well as rotational movement of the rod and wherein the rod and sleeve are provided with mutually co-operating rims in grooves adapted to impart the rotational movement to the rod during axial displacement of the rod in the sleeve and to inmpart to the valve element, a rotational movement relative to the valve seat before the valve element during opening, is lifted away from the valve seat and on closing, has been brought into engagement with the valve seat.
Description
2(~18~
EXHAt~ S T VA LV r The present invention relates to exhaust valves comprising a valve housing, a valve seat formed g thereln and a valve elemen~ supported by movable supporting means ~or moving the valve element into and o~ o~ sealing contact wlth t~e valve seat. The .~nvention par~lcularly relates to exhaust valves of ~his ~in~ for use in the exhaus~ duct ~rom the en-0 gine of a sub~arine.
One problem inherent ln exhaust valves is that due to the flow of usua~ly hot exhaust gases through the valve, dust particles and impurities tend to de-posit on the sealing surfaces o the valve element and the valve seat, and this gradially reduce~ the sealing ef fect of ~he valve . In o~der to reduce the amount of remaining deposit8 on the sealing surfaces of the valve element and on the valve seat. it is previously known in exhaust valves used in internal combustion enginDs to impart to the valve ele~ent a certain small rotary motlon in connection wl~h open-in~ ~d ~ iA~ a~ ~h~ ~l~c, .~ ~h~ ~o~
' valve element moves into contact with the seat it h~s been rotated a small angle in relation to the ~5 valve seat. Even if thi~ to a certain extent ~ay have a cle~n~ng effect lt does not provlde such grindlng effect as ob~ained by relative movemenc be-tween the sealing surfa~es, and as re~uired in order to eff~iently remove lmpur1ties which have adhe~ed 3~ to S~id sealing ~ur~aces. This may be one of ~he reasons why the met~od men~ioned above has not been ~ractised in exhaust valves of the kind used in the exhaust ducts of enaines of submarines. ~hen using exhaust valves o~ ~his kind it has proved nece~s~ry ~o dismount the valve regularly at relatively sho~
zn~ 8 intervals and to carry out grind~ng of the sealin~
surfaces between the valve element and the valve ~eat by means of spe~ia~. grin{ling t.ools.
EP-A-O 226 l~J dis~loses a valve ~Ise~ in lines ~ox liq~ids containiI~y pa~ti.cles, sa.id v-a1ve co~-prisirlg a valve housing, a valve seat formed therein and a valve element movable i~l said ho~sing between Opell position and closed posi~ion in e~lgage~ent with the valve seat. l`he valve elenlent is connected to a rod whic}l is axially displacea~le irl a cylin~rical s:l.eeve for ItlOVinS7 t.h~ valve element L)etween open anc~
closed pO~itiOIIs. By means of a dr~ve motor said ~od may be rotate~ to and fro for ~ransmittillg sald rotary mo~io~ to the valve e1ement when ~he valve 15 ell~ent is i.n its closed posi.t10rl znl~s6s 2~
One ob~ect of the ~resen~ inven~ion is ~o pro-S vlde an exhaust valve of t2le kln~ men~ioned initial-ly, ~n WhiCh an efficient grin~in~ action on the sealing suraces between valve element and valve sea~ is obtaine~ each time ~lle valve is opened and closed, said grlncling action b~in~ obtaine~ by ~e-0 la~ve move~nen~ be~ween the seallng sur~aces, saidsurfaces si.multaneously being urged towards each other 2~ a predetermine~ pressure force. Another ob~ect of the invention ir~ to prov~.de an exhaust valve includihg me~ns ~hicll automa~icall~ provides sai~ grindin~ action and ~hi~h is simple wit~ re-spect to its design and which without difficultY may be lrlcluded into t2~e supporting device used for mov-in~ the valve element into and oùt of engage~ent wlth the v~lve seat.
The objects mentioned above are obtalned by means o~: a desl~n in accordance wi~l1 the appended C 1 aims .
The inventlon will be described below wlth ~e-ference to an embo~imen~ o~ an exl-aust v~lve of the 26 kin~ used in the exhaust ~et rr~ln tlle en~ine of a submarine and Which iS ill~.ratefl on ~.he a~ended drawing, on whlc2~
- fi~ 1 is a lon~i~udinal section thxough an ex-h~ust valve in a~cordance with the invention, and 3~ - flg 2 is a section taken as indicated by I - I
in rig 1.
The exh~ust v~lve lllustrated in the ~iaures include a subs~antially spherical valve housing 1 pxovlde~ with two pipe sockets 2 and 3 ~espectively connec~ed wi~ll t2-e valve housina and extending ~o-2nlss6s axially wit~ respect to each other. The pipe socket2 extends a certain dis~ance into ~he valve housing an~ terminates in~o a ci~cular valve seat 4 co-operating with a valve disk S which ma~ be brou~ht into en~agement wi~h the valve seat~ By means o a supporting device 6 whicll is swingably mo~r1ted in the valve housing l. the valve disk 5 may be swung between closed position as indicated ~ ~nbroken lincs in fi.g 1 and open position as ~ n~i~ated by 0 dash-and-dot lines in fig 1. This supporting device 6 includes a sh~ft 7 rota~ably s~ppor~e~ in the valve housing l. said shaft extending within the v~lve housing l, through the ~alls thereo~ and ter-minateS outside the valve housing. A~ least une end of said shaf t 7 is connected to hy~raulic, pneu-matic, electrical or other power means, by means of wh~ch ~ha~t 7 may be rota~ed between two angula~
positions. Shaft 7 is disposed siae~ays and above the valve seat 4 and extends in parallel with a pl~ne through the upper edge of the valve sea~ 4.
Inside the valve housing l the shaft 7 is rigidly conne~ted with a hub 8 froln ~hich an arm 9 ex~ends in the directlon towards the valve sea~. Supporeed at the ~xee end of arm 9 is a pr~erably cy~1ndrical 2~ sleeve lO of annular c~oss section. said sleeve ex-.tending coa~iall~ with the p~pe socket 2. ~ rod ll of clrc~lar cross section is axi~lly displacable in said sleeve lO and extends throuyh end walls 12, 13 of said sleeve. At the end portion of rod 11 extend-ing ~owards the ~alve disk 5, rod ll is connected ~o~he v~lve disk 5 so that a rotati.onsl ~ovement of rod ll about i~s own aY~is is transmitted to the valve disk 5, thus l~parting to t~e valve disk a corresponding rotational movement. As shown in fig l 35~ the connection be~ween ~od 11 and valve disk 5 is znlss6s obtained by means of a spherl~al, ball-like member 14 ~ormed at the end of rod 11, said spherical membe~ being provided wi~h ~wo pins 15 extending from the ~phex~cal member 14 in opposite dirèctlons.
The spherical ~nember or ball 14 including the pins 15 is joun~led in the hub SA o~ the valvQ di~k S 90 t~at valve dis~ 5 ~ill have a ce~tain freedom of movement with respect to the rod 11, but so that when ro~ 11 is being rotated about i~s own axls, a coxxesponding rotational movem~nt is imp~rted to the valve dis~. Inside sleeve 10 the rod 11 is provided with a washer 16, rigidly connected to the rod. Dis-posed between the washer 16 and ~he upper end wall 3 of sleeve 10 is a compression spring 17 ~hich ~ontinuously exerts a press~re force on ehe washer ~nd thus on rod 11 ln the direction towards the .
valve seat. The sle~Ve 10 ~s provided W~th stopS 18 disposed on the inner surface of the sleeve above the washer 16, sald stops limiting the movement o~
washer 16 ln the sleeve 10 between the bottom 12 thereof and said stop 1~. ~asher 16 ls f~rther pro-vided with ~rooves, which cooperate wlth a cor-responding number o~ rims 19 which are rigidly con~
hected with sleeve lO on the insid~ the~eof between the bottom 12 of the sleeve and said stops 18. The rims 19 extend under a ~ertain inclination with x~-spe~t to the direction of the ~entral axis of rod 11 and sleev~ 10 respec~lvely. so that when rod 11 is being di~placed in the axial dire~tion of the sleeve 10, a rotatlonal movement about its own axis is im-parted to rod 11 by me~ns of washer 16. As mentioned previsously the rotational ~ovement is transmieted to the valve disk 4. Axial displacement of rod 11 thus imparts a rotational movement to the valve disk ~orresponding to the rotational movement of rod 11.
When opening the valve, which is shown in its c~osed position in fig 1. the arm 9 is made to swing counter-clockwise by rotating sha~t 7 counter cloc~-wi8e. During the ~irst sequence of said swln~ing movement tS~e valve ~isk 5 will rema~n in con~act w~th ~ e ~eat d under tlle inf~uenc~ o~ the force o~
the conpresslon sprin~ 17. due to the fact tha~
spring 17 expands~ Dùe to ~his ro~ 11 ls displa~ed axially with respecC ~o the sleeve. a rotational movement at the same time being imparted,to rod 11 vi~ rims 19 and ~lash~r 16. Thls rotational movement is trans~ltted to the valve disk whi~h thus is ~aus~
ed ~o carry out a correspondin~ rotational movement.
~uring this rotational movem~nt the valve dis~ is lS s~ill urged by p~essure ~orce towards the valve seac undex the influence of the force exex~ed by the spring. Due to this rotational movement, ~he valve disk performs a periferal sllding movement along the valve seat, thus exerting a grinding action on the 2~ ~alve ~eat, and due to this the valve seat is kept free from impurities. The swinging movemen~ of arm 9 ls continu~d until ~he fully open position of the valve has been reached, as indicated by dash-and-dot lines in fig 1.
When closing the valve arm 9 is made to swing in the opposite direction, 1 e clockwise. Under the in~l~ence o~ the ~orce $rom sprlng 17 the washer 16 in the sleeve 10 is kept in ab~tment against the bottom wall 12 of the sleeve 10. When the valve dlsk 5 during continued swinging movement ha~ ben swung in~o engagement with valve seat ~. continued swing-ing move~ent of arm 9 resul~s in th~t xod 11 is dis-placed with respect to the sleeve 10, at the same time comPressing sprlng 17. Via rims 1~ a~ld washer 16 ~ rotational mov~ment ls imparted to ~he rod 11 9~8 and thus also to the valve disk 5. During this rota-tional movemenl ~he valve dls~ 5 is in engagement with the valve xeat 4, thus exerting a grind~ng a~-tion on the seat.
6 The lnvention 1~ not limited to the embodlment described above with referen~e to the figures, but may be sub~ect to modifications wi~hin the scope of the ~ppended claims.
1~) 3~,
EXHAt~ S T VA LV r The present invention relates to exhaust valves comprising a valve housing, a valve seat formed g thereln and a valve elemen~ supported by movable supporting means ~or moving the valve element into and o~ o~ sealing contact wlth t~e valve seat. The .~nvention par~lcularly relates to exhaust valves of ~his ~in~ for use in the exhaus~ duct ~rom the en-0 gine of a sub~arine.
One problem inherent ln exhaust valves is that due to the flow of usua~ly hot exhaust gases through the valve, dust particles and impurities tend to de-posit on the sealing surfaces o the valve element and the valve seat, and this gradially reduce~ the sealing ef fect of ~he valve . In o~der to reduce the amount of remaining deposit8 on the sealing surfaces of the valve element and on the valve seat. it is previously known in exhaust valves used in internal combustion enginDs to impart to the valve ele~ent a certain small rotary motlon in connection wl~h open-in~ ~d ~ iA~ a~ ~h~ ~l~c, .~ ~h~ ~o~
' valve element moves into contact with the seat it h~s been rotated a small angle in relation to the ~5 valve seat. Even if thi~ to a certain extent ~ay have a cle~n~ng effect lt does not provlde such grindlng effect as ob~ained by relative movemenc be-tween the sealing surfa~es, and as re~uired in order to eff~iently remove lmpur1ties which have adhe~ed 3~ to S~id sealing ~ur~aces. This may be one of ~he reasons why the met~od men~ioned above has not been ~ractised in exhaust valves of the kind used in the exhaust ducts of enaines of submarines. ~hen using exhaust valves o~ ~his kind it has proved nece~s~ry ~o dismount the valve regularly at relatively sho~
zn~ 8 intervals and to carry out grind~ng of the sealin~
surfaces between the valve element and the valve ~eat by means of spe~ia~. grin{ling t.ools.
EP-A-O 226 l~J dis~loses a valve ~Ise~ in lines ~ox liq~ids containiI~y pa~ti.cles, sa.id v-a1ve co~-prisirlg a valve housing, a valve seat formed therein and a valve element movable i~l said ho~sing between Opell position and closed posi~ion in e~lgage~ent with the valve seat. l`he valve elenlent is connected to a rod whic}l is axially displacea~le irl a cylin~rical s:l.eeve for ItlOVinS7 t.h~ valve element L)etween open anc~
closed pO~itiOIIs. By means of a dr~ve motor said ~od may be rotate~ to and fro for ~ransmittillg sald rotary mo~io~ to the valve e1ement when ~he valve 15 ell~ent is i.n its closed posi.t10rl znl~s6s 2~
One ob~ect of the ~resen~ inven~ion is ~o pro-S vlde an exhaust valve of t2le kln~ men~ioned initial-ly, ~n WhiCh an efficient grin~in~ action on the sealing suraces between valve element and valve sea~ is obtaine~ each time ~lle valve is opened and closed, said grlncling action b~in~ obtaine~ by ~e-0 la~ve move~nen~ be~ween the seallng sur~aces, saidsurfaces si.multaneously being urged towards each other 2~ a predetermine~ pressure force. Another ob~ect of the invention ir~ to prov~.de an exhaust valve includihg me~ns ~hicll automa~icall~ provides sai~ grindin~ action and ~hi~h is simple wit~ re-spect to its design and which without difficultY may be lrlcluded into t2~e supporting device used for mov-in~ the valve element into and oùt of engage~ent wlth the v~lve seat.
The objects mentioned above are obtalned by means o~: a desl~n in accordance wi~l1 the appended C 1 aims .
The inventlon will be described below wlth ~e-ference to an embo~imen~ o~ an exl-aust v~lve of the 26 kin~ used in the exhaust ~et rr~ln tlle en~ine of a submarine and Which iS ill~.ratefl on ~.he a~ended drawing, on whlc2~
- fi~ 1 is a lon~i~udinal section thxough an ex-h~ust valve in a~cordance with the invention, and 3~ - flg 2 is a section taken as indicated by I - I
in rig 1.
The exh~ust v~lve lllustrated in the ~iaures include a subs~antially spherical valve housing 1 pxovlde~ with two pipe sockets 2 and 3 ~espectively connec~ed wi~ll t2-e valve housina and extending ~o-2nlss6s axially wit~ respect to each other. The pipe socket2 extends a certain dis~ance into ~he valve housing an~ terminates in~o a ci~cular valve seat 4 co-operating with a valve disk S which ma~ be brou~ht into en~agement wi~h the valve seat~ By means o a supporting device 6 whicll is swingably mo~r1ted in the valve housing l. the valve disk 5 may be swung between closed position as indicated ~ ~nbroken lincs in fi.g 1 and open position as ~ n~i~ated by 0 dash-and-dot lines in fig 1. This supporting device 6 includes a sh~ft 7 rota~ably s~ppor~e~ in the valve housing l. said shaft extending within the v~lve housing l, through the ~alls thereo~ and ter-minateS outside the valve housing. A~ least une end of said shaf t 7 is connected to hy~raulic, pneu-matic, electrical or other power means, by means of wh~ch ~ha~t 7 may be rota~ed between two angula~
positions. Shaft 7 is disposed siae~ays and above the valve seat 4 and extends in parallel with a pl~ne through the upper edge of the valve sea~ 4.
Inside the valve housing l the shaft 7 is rigidly conne~ted with a hub 8 froln ~hich an arm 9 ex~ends in the directlon towards the valve sea~. Supporeed at the ~xee end of arm 9 is a pr~erably cy~1ndrical 2~ sleeve lO of annular c~oss section. said sleeve ex-.tending coa~iall~ with the p~pe socket 2. ~ rod ll of clrc~lar cross section is axi~lly displacable in said sleeve lO and extends throuyh end walls 12, 13 of said sleeve. At the end portion of rod 11 extend-ing ~owards the ~alve disk 5, rod ll is connected ~o~he v~lve disk 5 so that a rotati.onsl ~ovement of rod ll about i~s own aY~is is transmitted to the valve disk 5, thus l~parting to t~e valve disk a corresponding rotational movement. As shown in fig l 35~ the connection be~ween ~od 11 and valve disk 5 is znlss6s obtained by means of a spherl~al, ball-like member 14 ~ormed at the end of rod 11, said spherical membe~ being provided wi~h ~wo pins 15 extending from the ~phex~cal member 14 in opposite dirèctlons.
The spherical ~nember or ball 14 including the pins 15 is joun~led in the hub SA o~ the valvQ di~k S 90 t~at valve dis~ 5 ~ill have a ce~tain freedom of movement with respect to the rod 11, but so that when ro~ 11 is being rotated about i~s own axls, a coxxesponding rotational movem~nt is imp~rted to the valve dis~. Inside sleeve 10 the rod 11 is provided with a washer 16, rigidly connected to the rod. Dis-posed between the washer 16 and ~he upper end wall 3 of sleeve 10 is a compression spring 17 ~hich ~ontinuously exerts a press~re force on ehe washer ~nd thus on rod 11 ln the direction towards the .
valve seat. The sle~Ve 10 ~s provided W~th stopS 18 disposed on the inner surface of the sleeve above the washer 16, sald stops limiting the movement o~
washer 16 ln the sleeve 10 between the bottom 12 thereof and said stop 1~. ~asher 16 ls f~rther pro-vided with ~rooves, which cooperate wlth a cor-responding number o~ rims 19 which are rigidly con~
hected with sleeve lO on the insid~ the~eof between the bottom 12 of the sleeve and said stops 18. The rims 19 extend under a ~ertain inclination with x~-spe~t to the direction of the ~entral axis of rod 11 and sleev~ 10 respec~lvely. so that when rod 11 is being di~placed in the axial dire~tion of the sleeve 10, a rotatlonal movement about its own axis is im-parted to rod 11 by me~ns of washer 16. As mentioned previsously the rotational ~ovement is transmieted to the valve disk 4. Axial displacement of rod 11 thus imparts a rotational movement to the valve disk ~orresponding to the rotational movement of rod 11.
When opening the valve, which is shown in its c~osed position in fig 1. the arm 9 is made to swing counter-clockwise by rotating sha~t 7 counter cloc~-wi8e. During the ~irst sequence of said swln~ing movement tS~e valve ~isk 5 will rema~n in con~act w~th ~ e ~eat d under tlle inf~uenc~ o~ the force o~
the conpresslon sprin~ 17. due to the fact tha~
spring 17 expands~ Dùe to ~his ro~ 11 ls displa~ed axially with respecC ~o the sleeve. a rotational movement at the same time being imparted,to rod 11 vi~ rims 19 and ~lash~r 16. Thls rotational movement is trans~ltted to the valve disk whi~h thus is ~aus~
ed ~o carry out a correspondin~ rotational movement.
~uring this rotational movem~nt the valve dis~ is lS s~ill urged by p~essure ~orce towards the valve seac undex the influence of the force exex~ed by the spring. Due to this rotational movement, ~he valve disk performs a periferal sllding movement along the valve seat, thus exerting a grinding action on the 2~ ~alve ~eat, and due to this the valve seat is kept free from impurities. The swinging movemen~ of arm 9 ls continu~d until ~he fully open position of the valve has been reached, as indicated by dash-and-dot lines in fig 1.
When closing the valve arm 9 is made to swing in the opposite direction, 1 e clockwise. Under the in~l~ence o~ the ~orce $rom sprlng 17 the washer 16 in the sleeve 10 is kept in ab~tment against the bottom wall 12 of the sleeve 10. When the valve dlsk 5 during continued swinging movement ha~ ben swung in~o engagement with valve seat ~. continued swing-ing move~ent of arm 9 resul~s in th~t xod 11 is dis-placed with respect to the sleeve 10, at the same time comPressing sprlng 17. Via rims 1~ a~ld washer 16 ~ rotational mov~ment ls imparted to ~he rod 11 9~8 and thus also to the valve disk 5. During this rota-tional movemenl ~he valve dls~ 5 is in engagement with the valve xeat 4, thus exerting a grind~ng a~-tion on the seat.
6 The lnvention 1~ not limited to the embodlment described above with referen~e to the figures, but may be sub~ect to modifications wi~hin the scope of the ~ppended claims.
1~) 3~,
Claims (2)
1. Exhaust valve comprising a valve housing (1), a valve seat (4) formed therein and a valve element (5) movable in said housing between open and closed po-sitions, a supporting device (6) movable in said housing (1) and supporting the valve element (S) for movement thereof between said open and closed posi-tions, the supporting device (6) comprising a pre-ferably cylindrical sleeve (lo) and a rod (11) which is axially displaceable in said sleeve between upper and lower positions, said rod (11) extending out of the sleeve towards the valve element (5) and being connected at its protruding end with the valve ele-ment (5) for transmitting axial as well as rota-tional movement of said rod to the valve element (5), said rod (11) being continuously urged towards its lower end position in the sleeve (10), c h a r a c t e r i z e d in that said rod (11) and sleeve (10) are provided with mutually cooperating rims and grooves adapted to impart a rotational movement to the rod (11) during axial displacement of said rod (11) in said sleeve, so as to impart to the valve element (5) a rotational movement relative to the valve seat before the valve element during opening is lifted from the valve seat and after the valve element during closing has been brought into engagement with the valve seat.
2. Exhaust valve as claimed in claim 1, c h a r a c t e r i z e d in that a washer (16) is rigidly connected to said rod (11), a compression Spring (17) being disposed between said washer (16) and an upper end wall (13) in said sleeve (10), said compression spring (17) continuously excerting a pressure force on said rod in a direction towards the valve seat, said washer (16) further being pro-vided with grooves cooperating with rims disposed on the inner surface of the sleeve and extending under an inclination with respect to the direction of the central axis of the rod and the sleeve so as to im-part to said rod and to said valve element a rota-tional movement when the rod is being displaced in the axial direction in the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2018968 CA2018968A1 (en) | 1990-06-14 | 1990-06-14 | Exhaust valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2018968 CA2018968A1 (en) | 1990-06-14 | 1990-06-14 | Exhaust valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2018968A1 true CA2018968A1 (en) | 1991-12-14 |
Family
ID=4145223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2018968 Abandoned CA2018968A1 (en) | 1990-06-14 | 1990-06-14 | Exhaust valve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2018968A1 (en) |
-
1990
- 1990-06-14 CA CA 2018968 patent/CA2018968A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |