CA1128568A - Mechanical seal assembly - Google Patents
Mechanical seal assemblyInfo
- Publication number
- CA1128568A CA1128568A CA360,702A CA360702A CA1128568A CA 1128568 A CA1128568 A CA 1128568A CA 360702 A CA360702 A CA 360702A CA 1128568 A CA1128568 A CA 1128568A
- Authority
- CA
- Canada
- Prior art keywords
- seal
- wall
- wall surface
- recess
- combination
- 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.)
- Expired
Links
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- Sealing Devices (AREA)
Abstract
Abstract A seal assembly has a resilient seal disposed within an open annular recess defined in a first member. A second member is disposed adjacent to and is deflectable toward and away from the recess opening. A deflecting device within the recess and responsive to the spacing between the first and second members is effective to deflect the seal to engage the first and second members over substantially the entire range of deflection of these members.
Description
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Description Mechanical Seal Assembly Technical Field This invention relates to a seal assembly for maintaining a pressure seal between two deflectable components over a relatively wide range of deflection.
Background Art The use of seals in structures such as track joints, loader linkages, undercarriage suspensions and the like is well known. Such structures are character-ized by movable elements which are subject to relative displacement, such as the relatively movable track link and bushiny in a track joint, for example. Seals are provided between such elements to retain lubricant between the elements during normal operations. Sub-stantial seal compressibility is necessary to provide uninterrupted sealing contact between the seals and the elements notwithstanding a substantial amount of move-ment which may result from deflection, wear, endplay, or deformation of the components.
Previous seal arrangements have been effective over only a limited degree of deflection due to the inability of conventional compression seals to maintain a desired degree of compression and, therefore, sealing contact between components when relatively narrow ranges of deflection are exceeded.
Reinsma U.S. patents 3,336,086, issued August 15, 1967; 3,390,922 issued July 2, 1968; and 3,390,923, issued July 2, 1968 show track pin assemblies having seal assemblies exemplary of the type described above.
:, Disclosure of Invention The~present invention is directed to over-coming one or more of the problems as set forth above.
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~ 2 -According to the present invention, there is provided a sealing assembly between a first member and a confronting wall surface of a second member which is movable towards and away from the first member, the assembly comprising a resilient seal which has a first portion sealingly engaged with a wall surface of the first member and a second portion sealingly engaged with the wall surface of the second member, the seal being ex-tendable perpendicular to the wall surface of the second member to maintain the sealing engagement between the seal portions and the wall surfaces upon movement of the second member away from the first member; and deflecting means bearing against the seal in a direction transversely to that in which the seal is extendable to deflect and thereby extend the seal as necessary to maintain the sealing engagement.
Brie _ escription of Drawi~
Fig. 1 is a side elevation of a track-type tractor employing an improved seal embodying the present invention;
Fig. 2 is an enlarged side elevation of a pair of track linkages used in the tractor of Fig. l;
Fig. 3 is a fragmentary top plan view of the track linkages of Fig. 2;
Fig. 4 is an enlarged section of a recess and seal employed in the track linkages of Fig. 3, with elements of the track linkages shown in a deflected position;
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Fig. 5 is a section of the recess and seal of Fig. 4, with the track linkage elements in abut-ting relation and the seal shown in a state of full compression;
Fig. 6 is a top plan view of a movable re-cess wall element of Figs. 4 and 5; and Fig. 7 is a section of the movable recess wall element of Fig. 6 taken along line 7-7.
Best Mode for Carrying Out the Invention Fig. 1 illustrates a track-type tractor 10 employing an improved seal. It is to be understood ~`
that the seal may be successfully employed in various machines or other structures having lubricated,-sealed hinge points, such as loader linkages or under-carriage suspensions, and that tractor 10 o~ Fig. 1 is exemplary only.
Tractor 10 includes a frame 12 carried by a pair o~ endless tracks 14. (Only one track 14 is shown for simpliciky.) The track 14 is driven by a sprocket 16 and travels about an idler 20. A plural-ity of track rollers 22 and carrier rollers 24 on the frame 12 support the track 14. -~
Track 14, a portion of which is shown schemat-ically, comprises a plurality of track linkages 26, each having a track shoe 30 secured to a pair of up-standing track links 32 and 33 (not shown in Fig. 1) which are carried by a pair of spaced, transversely extending track pins 34.
Figs. 2 and 3 show a pair of track lin~ages 26 in detail. A pair of track shoes 30 and 30a extend outwardly from the frame 12 (not shown in Figs. 2 and 3) and each track shoe 30 and 3Oa includes a mounting plate 40, an upstanding gripping projection 42 extend-ing from the plate 40, a forward lip 44 and an aft lip 46 integral with the plate 40. Each forward lip 44 extends upwardly and forwardly from i-ts associated mounting plate 40, and ,. , , .. : , :: : .. .: .
each aft lip 46 extends downwardly and rearwardly from its associated mounting plate 40. The aft lip 46 of the forward track shoe 30 lies below -the forward lip 44 of the following track shoe 30a.
Each mounting plate 40 is secured to each of a pair of transversely spaced track links 32 and 33, as by mounting bolts 50. Each track link 32 and 33 is pivotally carried by a pair of longitudinally spaced, transversely extending track pins 34, as described below.
As seen in Fig. 3, each track link 32 and 33 has a relatively wide central body portion 54, a trailing outer projection 56 of less thickness than the body portion 54, and a leading inner portion 58, also of less thickness than the body portion 5A. The trailing outer portion 56 o~ a leading link 32 mates with the leading inner portion 58 of a trailing link 32a to form a structure of a thickness substantially equal to that of the body portion 54.
Each pin 34 has an elongate bushing 62 posi-tioned thereabout. Each link inner portion 5~ has an aperture 64 of a diameter sufficient to capture an end 66 of the bushing 62, and each link outer portion 56 has an aperture 67 of a diameter sufficient to capture an end 68 of the pin 34. It is to be understood that the link portions 56 and 58 are press-fit upon the pin 34 and the bushing 62, respectively, and are ro-tatably pivotal thereabout.
Each bushing end 66 has a transverse end wall 74 which abuts a wall 76 on the link outer portion 56, which wall 76 also abuts an outer wall 78 of the link inner portion 58. An annular recess 82 is formed in the link outer portion 56 and a lubricated seal 84 is disposed therein, as described below.
It is to be emphasized that the sealed inter-face defined by the bushing end wall 74, link wall 76, ..
. .
and the seal 84 disposed therehetween in Fig. 3 is a preferred embodiment, and ns unnecessary limitations are to be inferred therefrom. Although the seal 84, shown to be disposed within an annular recess 82 in a track link 33, and means (to be described be:Low) associated with the seal 84 to maintain the seal 84 in sealing con-tact with the wall 74 and the link 33 are shown as a movable side wall of the recess 82, it is to be understood that the scope of the invention broadly encompasses structures having variably spaced wall surfaces utllizing resilient seals with or without annular recessed seats, d and may include seal urging means other than the movable recess side wall described below.
Referring now to Figs. 4 and 5, the seal 84 is described in detail. The recess 82 in the link outer element 56 is defined by a fixed radial end wall 86, a fixed annular axial side wall 88 and by a movable annular axial side wall 90 disposed radially inwardly of the fixed side wall 88.
The movable side wall 90 comprises a frusto-conical axial portion 92 having an integral generally radial lip 94 projecting inwardly from an edge 95 of the axial portion 92 at an angle other than 90. (Al-though an acute angle is illustrated, the lip 94 may alternately extend from the edge 95 at an obtuse angle.) A thrust ring 100 is slidably disposed about the pin 34 and cooperates with the lip 94 to limit the travel of the bushing 62 toward the outer link element 56.
The thrust ring 100 includes axially inner and outer radial abutment surfaces 102 and 104, respec-tively. An outer axial cylindrical surface 106 extends between the surfaces 102 and 104.
The resilient seal 84 is disposed within the recess 82 and engages the ~ixed walls 86 and 88, the axial movable wall portion 92 and the bushing wall 74.
, The seal 84 of Figs. 4 and 5 comprises a radially cut-wardly disposed load ring 112 and a radially inwardly disposed crescent-shaped element 114. It is to be understood that the structure of the seal 84 ls not critical to the present invention, and no unnecessary limitations should be inferred therefrom.
The movable wall 90 is shown in detail in its unstressed state in Figs. 6 and 7. The axial portion 92 is serrated and includes elongate axially extending 10 apertures 120 which extend radially into the lip 94 to enhance compressibility.
Industrial Applicability During operation o the tractor 10, the link portions 56 and 58 may be momentarily deflected from one another, as shown in Fig~ 4. It is desirable to main-tain the seal 84 and, more speciEically, the crescent-shaped seal element 114 in sealing contact with the bushing wall 74 and the recess walls 86, 88 and 92.
Upon deflection of the bushing wall 74 from 20 the recess 82, movement of the thrust ring 100 away from the end wall 86 allows the radial portion 94 of the movable wall 90 to bias the axial wall portion 92 gener-ally radially outwardly to urge the relatively resilient seal elements 112 and 114 axially outwardly of the recess 82 to maintain sealing contact between the bushing wall 74, at a point 122, and the walls 86, 88 and 92.
Axial displacement of the bushing wall 74 rom the recess 82 thereby results in radial expansion of the movable wall 90 to reduce the volume of the seal cavity 82. If desired, the radial portion 94 of the movable wall 90 may be disposed between the bushing wall 74 and the thrust ring radial wall 104, but the pivotal biasing action of the movable wall 90 will be identical to that described above.
It should be noted that the preferred length of the axial movable wall portion 92 and the thickness , ,: ~ ` ' ` ' . ' : ~ ' :
of the lip 94 are chosen such that the combined axial length of the thrust ring 100 and the thickness of the lip 94 is approximately equal to the axial length of the fixed side wall 88 to allow abutment oE the bushing wall 74 with the thrust ring outer radial wall 104 (or with the lip 94, depending upon which radial wall the lip 94 pivots) when the bushing 62 abuts the outer link 56.
It is apparent that the improved seal provides effective sealing between deflectable elements of a track linkage or like structure over relatively wide ~;
ranges of deflection of the linkage elements and recluces loss of lubricant from the seal, thereby prolonging the effective life of linkage elements.
Other aspects, objects and advantages of this invention can be obtained from a study of the drawings, the disclosure and the appended claims.
~" :
.
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,
Description Mechanical Seal Assembly Technical Field This invention relates to a seal assembly for maintaining a pressure seal between two deflectable components over a relatively wide range of deflection.
Background Art The use of seals in structures such as track joints, loader linkages, undercarriage suspensions and the like is well known. Such structures are character-ized by movable elements which are subject to relative displacement, such as the relatively movable track link and bushiny in a track joint, for example. Seals are provided between such elements to retain lubricant between the elements during normal operations. Sub-stantial seal compressibility is necessary to provide uninterrupted sealing contact between the seals and the elements notwithstanding a substantial amount of move-ment which may result from deflection, wear, endplay, or deformation of the components.
Previous seal arrangements have been effective over only a limited degree of deflection due to the inability of conventional compression seals to maintain a desired degree of compression and, therefore, sealing contact between components when relatively narrow ranges of deflection are exceeded.
Reinsma U.S. patents 3,336,086, issued August 15, 1967; 3,390,922 issued July 2, 1968; and 3,390,923, issued July 2, 1968 show track pin assemblies having seal assemblies exemplary of the type described above.
:, Disclosure of Invention The~present invention is directed to over-coming one or more of the problems as set forth above.
.. ,~. ~ , , , . ~k :
: . : . , ,: . ~ , -.,, ~
. : ~ , , ~. . ~ " .:
~ 2 -According to the present invention, there is provided a sealing assembly between a first member and a confronting wall surface of a second member which is movable towards and away from the first member, the assembly comprising a resilient seal which has a first portion sealingly engaged with a wall surface of the first member and a second portion sealingly engaged with the wall surface of the second member, the seal being ex-tendable perpendicular to the wall surface of the second member to maintain the sealing engagement between the seal portions and the wall surfaces upon movement of the second member away from the first member; and deflecting means bearing against the seal in a direction transversely to that in which the seal is extendable to deflect and thereby extend the seal as necessary to maintain the sealing engagement.
Brie _ escription of Drawi~
Fig. 1 is a side elevation of a track-type tractor employing an improved seal embodying the present invention;
Fig. 2 is an enlarged side elevation of a pair of track linkages used in the tractor of Fig. l;
Fig. 3 is a fragmentary top plan view of the track linkages of Fig. 2;
Fig. 4 is an enlarged section of a recess and seal employed in the track linkages of Fig. 3, with elements of the track linkages shown in a deflected position;
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Fig. 5 is a section of the recess and seal of Fig. 4, with the track linkage elements in abut-ting relation and the seal shown in a state of full compression;
Fig. 6 is a top plan view of a movable re-cess wall element of Figs. 4 and 5; and Fig. 7 is a section of the movable recess wall element of Fig. 6 taken along line 7-7.
Best Mode for Carrying Out the Invention Fig. 1 illustrates a track-type tractor 10 employing an improved seal. It is to be understood ~`
that the seal may be successfully employed in various machines or other structures having lubricated,-sealed hinge points, such as loader linkages or under-carriage suspensions, and that tractor 10 o~ Fig. 1 is exemplary only.
Tractor 10 includes a frame 12 carried by a pair o~ endless tracks 14. (Only one track 14 is shown for simpliciky.) The track 14 is driven by a sprocket 16 and travels about an idler 20. A plural-ity of track rollers 22 and carrier rollers 24 on the frame 12 support the track 14. -~
Track 14, a portion of which is shown schemat-ically, comprises a plurality of track linkages 26, each having a track shoe 30 secured to a pair of up-standing track links 32 and 33 (not shown in Fig. 1) which are carried by a pair of spaced, transversely extending track pins 34.
Figs. 2 and 3 show a pair of track lin~ages 26 in detail. A pair of track shoes 30 and 30a extend outwardly from the frame 12 (not shown in Figs. 2 and 3) and each track shoe 30 and 3Oa includes a mounting plate 40, an upstanding gripping projection 42 extend-ing from the plate 40, a forward lip 44 and an aft lip 46 integral with the plate 40. Each forward lip 44 extends upwardly and forwardly from i-ts associated mounting plate 40, and ,. , , .. : , :: : .. .: .
each aft lip 46 extends downwardly and rearwardly from its associated mounting plate 40. The aft lip 46 of the forward track shoe 30 lies below -the forward lip 44 of the following track shoe 30a.
Each mounting plate 40 is secured to each of a pair of transversely spaced track links 32 and 33, as by mounting bolts 50. Each track link 32 and 33 is pivotally carried by a pair of longitudinally spaced, transversely extending track pins 34, as described below.
As seen in Fig. 3, each track link 32 and 33 has a relatively wide central body portion 54, a trailing outer projection 56 of less thickness than the body portion 54, and a leading inner portion 58, also of less thickness than the body portion 5A. The trailing outer portion 56 o~ a leading link 32 mates with the leading inner portion 58 of a trailing link 32a to form a structure of a thickness substantially equal to that of the body portion 54.
Each pin 34 has an elongate bushing 62 posi-tioned thereabout. Each link inner portion 5~ has an aperture 64 of a diameter sufficient to capture an end 66 of the bushing 62, and each link outer portion 56 has an aperture 67 of a diameter sufficient to capture an end 68 of the pin 34. It is to be understood that the link portions 56 and 58 are press-fit upon the pin 34 and the bushing 62, respectively, and are ro-tatably pivotal thereabout.
Each bushing end 66 has a transverse end wall 74 which abuts a wall 76 on the link outer portion 56, which wall 76 also abuts an outer wall 78 of the link inner portion 58. An annular recess 82 is formed in the link outer portion 56 and a lubricated seal 84 is disposed therein, as described below.
It is to be emphasized that the sealed inter-face defined by the bushing end wall 74, link wall 76, ..
. .
and the seal 84 disposed therehetween in Fig. 3 is a preferred embodiment, and ns unnecessary limitations are to be inferred therefrom. Although the seal 84, shown to be disposed within an annular recess 82 in a track link 33, and means (to be described be:Low) associated with the seal 84 to maintain the seal 84 in sealing con-tact with the wall 74 and the link 33 are shown as a movable side wall of the recess 82, it is to be understood that the scope of the invention broadly encompasses structures having variably spaced wall surfaces utllizing resilient seals with or without annular recessed seats, d and may include seal urging means other than the movable recess side wall described below.
Referring now to Figs. 4 and 5, the seal 84 is described in detail. The recess 82 in the link outer element 56 is defined by a fixed radial end wall 86, a fixed annular axial side wall 88 and by a movable annular axial side wall 90 disposed radially inwardly of the fixed side wall 88.
The movable side wall 90 comprises a frusto-conical axial portion 92 having an integral generally radial lip 94 projecting inwardly from an edge 95 of the axial portion 92 at an angle other than 90. (Al-though an acute angle is illustrated, the lip 94 may alternately extend from the edge 95 at an obtuse angle.) A thrust ring 100 is slidably disposed about the pin 34 and cooperates with the lip 94 to limit the travel of the bushing 62 toward the outer link element 56.
The thrust ring 100 includes axially inner and outer radial abutment surfaces 102 and 104, respec-tively. An outer axial cylindrical surface 106 extends between the surfaces 102 and 104.
The resilient seal 84 is disposed within the recess 82 and engages the ~ixed walls 86 and 88, the axial movable wall portion 92 and the bushing wall 74.
, The seal 84 of Figs. 4 and 5 comprises a radially cut-wardly disposed load ring 112 and a radially inwardly disposed crescent-shaped element 114. It is to be understood that the structure of the seal 84 ls not critical to the present invention, and no unnecessary limitations should be inferred therefrom.
The movable wall 90 is shown in detail in its unstressed state in Figs. 6 and 7. The axial portion 92 is serrated and includes elongate axially extending 10 apertures 120 which extend radially into the lip 94 to enhance compressibility.
Industrial Applicability During operation o the tractor 10, the link portions 56 and 58 may be momentarily deflected from one another, as shown in Fig~ 4. It is desirable to main-tain the seal 84 and, more speciEically, the crescent-shaped seal element 114 in sealing contact with the bushing wall 74 and the recess walls 86, 88 and 92.
Upon deflection of the bushing wall 74 from 20 the recess 82, movement of the thrust ring 100 away from the end wall 86 allows the radial portion 94 of the movable wall 90 to bias the axial wall portion 92 gener-ally radially outwardly to urge the relatively resilient seal elements 112 and 114 axially outwardly of the recess 82 to maintain sealing contact between the bushing wall 74, at a point 122, and the walls 86, 88 and 92.
Axial displacement of the bushing wall 74 rom the recess 82 thereby results in radial expansion of the movable wall 90 to reduce the volume of the seal cavity 82. If desired, the radial portion 94 of the movable wall 90 may be disposed between the bushing wall 74 and the thrust ring radial wall 104, but the pivotal biasing action of the movable wall 90 will be identical to that described above.
It should be noted that the preferred length of the axial movable wall portion 92 and the thickness , ,: ~ ` ' ` ' . ' : ~ ' :
of the lip 94 are chosen such that the combined axial length of the thrust ring 100 and the thickness of the lip 94 is approximately equal to the axial length of the fixed side wall 88 to allow abutment oE the bushing wall 74 with the thrust ring outer radial wall 104 (or with the lip 94, depending upon which radial wall the lip 94 pivots) when the bushing 62 abuts the outer link 56.
It is apparent that the improved seal provides effective sealing between deflectable elements of a track linkage or like structure over relatively wide ~;
ranges of deflection of the linkage elements and recluces loss of lubricant from the seal, thereby prolonging the effective life of linkage elements.
Other aspects, objects and advantages of this invention can be obtained from a study of the drawings, the disclosure and the appended claims.
~" :
.
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,
Claims (16)
1. A sealing assembly between a first member and a confronting wall surface of a second member which is movable towards and away from the first member, the assembly comprising a resilient seal which has a first portion sealingly engaged with a wall surface of the first member and a second portion sealingly engaged with the wall surface of the second member, the seal being ex-tendable perpendicular to the wall surface of the second member to maintain the sealing engagement between the seal portions and the wall surfaces upon movement of the second member away from the first member; and deflecting means bearing against the seal in a direction transversely to that in which the seal is extendable to deflect and thereby extend the seal as necessary to maintain the sealing engagement.
2. An assembly according to claim 1, in which the seal is of substantially crescent shape, the deflec-ting means bearing against the back of the crescent so as to extend the seal by spreading the ends of the crescent.
3. An assembly according to claim 2, in which the seal and deflecting means are such that the sealing force between the seal portions and the wall surfaces is substantially constant over the range of movement of the second member relatively to the first member.
4. An assembly according to claim 3, in which the deflecting means is of angular section having a portion bearing against the seal and a lip extending trans-versely away from the portion and positioned between a thrust member and either the wall surface of the second member or a wall surface of the first member facing the wall surface, the arrangement being such that when the second member approaches the first member the thrust member engages the lip and rocks the lip and deflecting means portion about an edge engaging the adjacent wall surface to reduce the bearing pressure of the deflec-ting means on the seal.
5. An assembly according to claim 1, in which the first member provides a recess which is con-fronted by the wall surface of the second member and in which the seal is disposed, the deflecting means forming a side wall of the recess.
6. An assembly according to claim 1, which is annular, the seal being extendable in the axial direction and the deflecting means bearing radially outwardly on the seal.
7. An assembly according to claim 6, in which the deflecting means comprises a resilient frusto-conical portion which bears against the seal.
8. A combination of a track pin assembly and a sealing assembly according to claim 1, wherein the track pin assembly comprises a track link forming the first member and having an annular recess confronted by a wall surface of a bushing forming the second member which is movable in the axial direction towards and away from an open end of the recess; the recess being defined by a radially extending axially inner end wall surface and an axially extending radially outer side wall surface which are fixed to the first member and by a radially movable axially extending radially inner wall which is provided by the deflecting means and is biased radially outwardly; and the portion of the seal sealingly engaging both the fixed wall surfaces.
9. The combination of claim 8 wherein said outer portion of said seal extends resiliently axially outwardly of said recess for engagement with said bushing wall when said bushing wall is spaced from said recess.
10. The combination of claim 8 where-in said biasing means comprises resilient means integral with and extending generally radially from said movable side wall at an acute angle thereto for engagement with at least one of said fixed end wall and said bushing wall.
11. The combination of claim 8 wherein said biasing means comprises resilient means integral with and extending generally radially from said movable side wall at an oblique angle for engagement with at least one of said fixed end wall and said bushing wall.
12. The combination of claim 8 wherein said movable side wall comprises a resilient element engaging and exerting compressive force on said seal means and on at least one of said fixed end wall and said bushing wall.
13. The combination of claim 12 wherein said resilient element includes an elongate axial portion for engagement with said seal means and an integral por-tion projecting from said axial portion for engagement with one of said fixed end wall and said bushing wall.
14. The combination of claim 13 wherein said resilient element is generally frusto-conical in shape.
15. The combination of claim 8 further including means for limiting the radially outward movement of said movable side wall.
16. The combination of claim 14 further including means for limiting the radially outward movement of said movable side wall, said limiting means comprising a cylindrical element disposed radially inwardly of said axial portion of said resilient element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA360,702A CA1128568A (en) | 1980-09-22 | 1980-09-22 | Mechanical seal assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA360,702A CA1128568A (en) | 1980-09-22 | 1980-09-22 | Mechanical seal assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128568A true CA1128568A (en) | 1982-07-27 |
Family
ID=4117939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA360,702A Expired CA1128568A (en) | 1980-09-22 | 1980-09-22 | Mechanical seal assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1128568A (en) |
-
1980
- 1980-09-22 CA CA360,702A patent/CA1128568A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |