GB2165282A - Rotatable liner arrangement with tandem cone liner hanger - Google Patents
Rotatable liner arrangement with tandem cone liner hanger Download PDFInfo
- Publication number
- GB2165282A GB2165282A GB08431331A GB8431331A GB2165282A GB 2165282 A GB2165282 A GB 2165282A GB 08431331 A GB08431331 A GB 08431331A GB 8431331 A GB8431331 A GB 8431331A GB 2165282 A GB2165282 A GB 2165282A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liner
- sleeve means
- hanger
- segments
- well bore
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 230000009977 dual effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
A running string is releasably connected to a liner (L) and liner hanger setting arrangement (H) for lowering into a well bore casing (C) and securing the liner (L) to a casing. The liner hanger setting arrangement includes a first sleeve (S) with upper and lower annular rows (14, 15) of conically shaped segments (14a, 15a) circumferentially spaced thereon. Upper and lower spaced rows (16, 17) of hanger slips (16a, 17a) are connected to a second sleeve (S') by elongated strips (16b, 17b) and the second sleeve (S') is releasably secured to the first sleeve (S) whereby the second sleeve (S') may be released from the sleeve (S) for relative longitudinal movement therebetween to move the hanger slips (16a, 17a) onto the segments (14a, 15a) and secure the liner (L) to the casing (C). The space between the segments (14a, 15a) in each row (14, 15) is substantial to accommodate relatively unrestricted fluid flow thereabout as the apparatus is manipulated and operations conducted in the well bore. After the running string is disconnected from the liner (L) and liner hanger, it is lowered to releasably connect splines on the running string and upper end of the liner. The liner (L) has a rotatable bearing (13) above said sleeves and liner hanger and rotation of the running string is thus transmitted to the liner as it is cemented in the well bore. <IMAGE>
Description
SPECIFICATION
Rotatable liner arrangement with tandem cone liner hanger
This invention relates generally to an arrangement for securing a liner to a well bore casing and cementing it in position in the well bore.
Single and dual cone liner hanger arrangements are well known in the art as is rotation of the liner with a single cone arrangement.
However, prior to this invention, it has been accepted practice to use a plurality of single cone longitudinally spaced liner hanger arrangements with a rotating liner arrangement which greatly restricts fluid flow during the cementing operations conducted in a well bore.
The present invention overcomes this problem in that it provides a dual or tandem cone liner hanger arrangement which accommodates flow of fluid thereabout without any substantial restriction to such fluid flow while also accommodating rotation of the liner during the cementing operation.
Figure 1A is a longitudinal quarter sectional view of the upper end of a liner extension to which the liner is connected and showing a running string releasably connected therewith for lowering into a well bore;
Figure 18 is a continuation of the view illustrated in Fig. 1A showing a liner hanger including a tandem cone arrangement and bearing means thereabove to accommodate rotation of the liner after it has been secured to a well bore casing by the liner hanger arrangement;
Figure 2A is similar to Fig. 1A but demonstrates the position of the running string relative to the upper liner extension and liner after the running string has been disconnected therefrom and then reconnected therewith by lowering the running string for rotation of the liner;;
Figure 2B is a continuation of Fig. 2A demonstrating the hanger slips of the hanger arrangement in position on the conically shaped segments of the hanger arrangement and engaged with the well bore casing to secure or hang the liner to the well bore casing;
Figure 3 is a sectional view on the line 3-3 of Fig. 2B demonstrating further structural details;
Figure 4 is a sectional view on the line 4-4 of Fig. 2B; and
Figure 5 demonstrates the lower portion of the present invention with a mechanical set liner hanger arrangement.
Attention is first directed to Fig. 1A wherein a liner extension E is shown as being releasably connected to the running string R by means of a left-hand threaded nut 7 which surrounds the tubular portion 11 of the running string R and engages a thread 8 on the extension E. The nut abuts the shoulder 9 of the collar 10 on running string R. The portion 11 of the running string is noncircular as is the opening through the nut 7 through which it extends so that the nut 7 may be backed out of the threads 8 upon rotation of the running string. A seal bushing 12 is releasably secured to the liner extension E and includes seals to seal between the liner extension E and the running string R during cementing operation in the well bore.The retrievable bushing 12 is retrieved when the running string R is removed after the liner has been secured to the casing and the cementing operations conducted, the construction of such seal bushing being well known in the art. The upper extension E is provided at its lower end with rotatable bearing means referred to generally by the letter B. Abutting the lower end of the annular bearing means B are first sleeve means S, and the upper extension E extends longitudinally through the first sleeve means as shown in the drawings. The liner L is connected to the lower end 13 of the upper extension E and depends therefrom as shown.
The liner hanger setting arrangement is referred to generally by the letter H and is in effect part of the liner L by reason of the upper liner extension E which extends upwardly from the liner L as shown in the drawings and through the liner hanger arrangement
H. The liner hanger arrangement H includes the first sleeve mean S which extends longitudinally about the liner extension E as shown and the first liner means S is provided with upper and lower longitudinally spaced, annular rows 14 and 15 of conically shaped segments 14A and 15a respectively. It is to be noted that the conically shaoed segments 14a in the upper row 14 are circumferentially spaced relative to each other by the spaces 14b therebetween and are offset circumferentially relative to the conically shaped segments 1 5a in the row 15.The segments 15a are circumferentially spaced relative to each other by the circumferential spaces 15b therebetween as illustrated. The conically shaped segments 14a and 15a of each row 14, 15, respectively, extend longitudinally of the first sleeve means
S and the segments 14a, 15a are provided with an outwardly and upwardly tapered surface 14c and 15c, respectively, as shown.
Upper and lower longitudinally spaced annular rows of hanger slips 16 and 17, respectively, are formed by the hanger slips 16a, 17a, respectively, with the hanger slips 1 6a in row 16 being offset circumferentially relative to slips 17a in row 17 and with the slips 16a in the row 16 and the slips 17a in the row 1 7 being circumferentially spaced from each other to provide circumferential spaces therebetween whereby the hanger slips 1 6a are longitudinally aligned with the conically shaped segments 1 4a and the hanger slips 1 7a are longitudinally aligned with the segments 15a in the row 15. Elongated strips 16b are con nected with the hanger slips 1 6a in row 16 and depend therefrom.The strips 1 6b extend longitudinally of the first sleeve means S and through the spaces 15b of the lower row 17 of the hanger slips 17 as shown and are connected at their lower end to second sleeve means S'.
Attention is directed to Fig. 4 of the drawings wherein the hanger slips 1 7a of the lower row 17 are shown moved up onto tapered surfaces 15c of segments 15a and engaged with the casing C to secure the liner L therewith and it will be noted that the size of the longitudinal strips 1 6b connected with the slips 1 6a in the upper row 16 is relatively small compared with the extent of the space 15b between the conically shaped segments 15a. This provides an arrangement which accommodates substantially unrestricted flow of fluid during cementing operations of the liner in the well bore and overcomes the problems heretofore encountered in using a plurality longitudinally spaced single cone liner hanger means in a rotatable liner arrangement.A strip 17b is connected to each of the hanger slips 1 7a and extends downwardly therefrom and is connected at its lower ends to the second sleeve S' by means of bolts 19' as shown.
The lower end of the strip 16b is secured to the second sleeve S' by any suitable means such as nuts or bolts 19. The strips 16b are also secured to guide means G which includes a collar 20 connected to the strips 16b between the upper and lower rows 16, 17 of hanger slips 16a, 17a by the nuts or bolts 21. The guide means G also includes projection means 22 on collar 20 fitting in the longitudinal slot 23 of the sleeve S to maintain the hanger slips 16a in the row 16 aligned properly with the conically shaped segments 14a in the first annular row 14. In Fig. 5, the guide means G is in the form of a small bracket 50 positioned between the conical segments 15a through which bracket 50 the strips extend. This arrangement also does not restrict flow.
The lower end of the first sleeve means S and second sleeve means S' are each supported on the upper liner extension E by means of suitable projection means such as an annular ring as illustrated at 25.
The second sleeve means S' is received within the annular and longitudinally extending recess 26 formed between the lower end of liner extension E and the upper end of liner L as shown in Fig. 1B, with suitable piston means P having suitable seals 27 and 28 whereby the second sleeve means S' and the longitudinally extending strips 16b, 1 7b may be moved upwardly to position the hanger slips 16a, 17a on the their respective segments when pressure fluid is supplied through the port 30 in liner extension E from the running string R in a manner well known to urge the piston means P and the second sleeve means S' upwardly. When the slips 16a, 17a are moved up and urged outwardly to engage casing C, sleeve S, liner extension E and liner
L secured to the casing C.The second sleeve means S' is releasably secured to liner L by shear pin 29, and when it is sheared by the movement of second sleeve S' to liner extension E, the second sleeve is released for longitudinal movement relative to sleeve S.
In Figs. 2A, 2B, the form of liner hanger setting arrangement shown in Figs. 1A and 1B is illustrated after the second sleeve S' has been moved upwardly by hydraulic pressure to engage the hanger slips 16a and 17a with the conically shaped segments 1 4a and 15a, respectively. Also, these figures show the well or running string R after the running string has been rotated to release nut 7 from liner extension E and liner hanger H, and the running string R lowered to engage the upper liner extension E for rotation of the liner L during cementing operations.A plurality of circumferentially spaced external projections 32 are provided on the running string R which engage with a plurality of circumferentially spaced internal projections 33 on the extension E whereby rotation of the running string R will rotate the liner L and the upper liner extension
E by means of the bearing B above the upper row 14 of conically shaped segments. Specifically, the sleeve S is secured to the casing since at this time segments 14a, 15a and slips 16a, 17a on sleeve S are engaged with casing C. Further, the extension E extends through sleeve S and is rotatable by the rotation of the running string relative to first sleeve means S as it is secured by slips 16a, 1 7a to casing C, as above described.
In Fig. 5, the invention is demonstrated where a mechanically set form of liner hanger arrangement H is employed. It can be appreciated that the portion of the invention above the row 15 of conically shaped segments 15a is identicai to that illustrated in Figs. 1B and 1A and that the operation and function of the invention is substantially the same with the exception that the hanger arrangement H is mechanically set as opposed to being hydraulically set. Similar numbers are applied to similar parts.
In the form shown in Fig. 5, an extension 35 of the second sleeve S' is provided which is rotatably supported by the second sleeve S' and depends therefrom by reason of the overhanging annular shoulder 36 resting on a ring 37 supported on the ledge 38 of second sleeve S'. Circumferentially spaced bow springs 40 extend longitudinally of the depending portion 35 of second sleeve means S' and a pin 41 is provided on the extension E as shown. When slight rotation is imparted to the running string R before the left-hand nut 7 is disengaged, rotation of the liner hanger arrangement H is restrained by the bow springs 40 so that the extension E rotates with the running string R to thereby disengage pin 41 from the J slot arrangement 42 in second sleeve S'. The J slot 42 and pin 41 form the releasable connection between the second sleeve S' and liner L in the Fig. 5 form.Also, the circumferentially spaced bow springs 40 restrain longitudinal movement between the liner hanger arrangement H and the upper entension E so that subsequent lowering of the running string R effects relative longitudinal movement between the second sleeve means
S' and the extension E, including first sleeve means S, to urge the slips 16a, 17a onto their respective conically shaped segments for securing the liner L to the casing C. Thereafter, rotation of the running string R may be effected to disconnect the nut 7 from the liner extension E, is previously described, so that running string R as disconnected from extension E, liner L and liner hanger H. The running string R is then lowered to engage the splines 32 with the splines 33 for rotation of the liner
L in a manner as previously described as the liner L is connected in the well bore.
The foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the size, shape and materials as well as in the details of the illustrated construction may be made without departing from the spirit of the invention.
Claims (9)
1. A rotatable liner having a liner hanger setting to accommodate substantially unrestricted fluid flow in the well bore casing thereabout and rotation of the liner during cementing operations comprising a running string for lowering the liner and liner hanger setting arrangement into the well bore; means to releasably connect the liner and liner hanger setting arrangement with the running string; said liner hanger setting arrangement being supported on the liner for engaging with the well bore casing to support the liner on the well bore casing, said arrangement including first sleeve means extending longitudinally about the liner; upper and lower longitudinally spaced, annular rows of conically shaped segments on said first sleeve means, said segments in each row being circumferentially spaced about said first sleeve means with the segments in the first row being generally circumferentially offset from the segments in the second row, said conically shaped segments extending longitudinally on said first sleeve means and tapered upwardly and outwardly relative thereto; upper and lower longitudinally spaced rows of hanger slips circumferentially spaced and longitudinally aligned with the conically shaped segments whereby the rows of hanger slips may be moved along said sleeve means and into engagement with the rows of segments to secure the liner hanger setting arrangement with the well bore casing and support the liner on the well bore casing; elongated strips secured to and depending longitudinally from each of said slips and circumferentially spaced about said first sleeve means with the strips from the upper row of hanger slips extending through the space between the segments in the lower row, the space between the segments in each row being of substantially larger circumferential extent than said strips; second sleeve means slidably secured on the liner with which the lower ends of said strips are secured; means to releasably secure said second sleeve means to the liner whereby said second sleeve means may be released for relative longitudinal movement between it and said first sleeve means whereupon said hanger slips move onto the conically shaped segments and engage the well bore casing to secure the liner therewith; guide means to maintain the hanger slips aligned with their respective conically shaped segments; and bearing means on the liner above said first sleeve means to accommodate rotation of the liner after it has been secured to the casing; and means on the running string releasbly engageable with the liner upon lowering the running string for rotating the liner by rotating the running string after the running string and liner hanger setting arrangement have been disconnected from each other.
2. An arrangement as claimed in claim 1 wherein the means to releasably secure said second sleeve means to the liner comprises shear means, and wherein the lower end of said second sleeve means is telescopically received within an annular chamber in the liner, piston means abutting the lower end of said second sleeve means within the annular chamber and having seal means responsive to fluid pressure from the running string for moving said second sleeve means longitudinally of said first sleeve means for engagement of the hanger slips with the conically shaped segments.
3. An apparatus of claim 1 wherein the means to releasably secure said second sleeve means to the liner includes a J slot on said second sleeve means and a projecting pin on the liner normally engages in the J slot as the running string is lowered into the well bore, but which may be disengaged by rotation of the running string to release the second sleeve means; bow spring means on said second sleeve means to restrain rotation of said second sleeve means relative to the running string as it is rotated whereby said pin and J slot disengage to release said second sleeve means for relative longitudinal movement between it and said first sleeve means.
4. A dual cone liner hanger setting arrangement for lowering with a liner on a running string in a well bore casing to accommodate fluid flow in the well bore casing and rotation of the liner during cementing operations comprising: sleeve means extending longitudinally of the liner; means to accommodate relative rotation between said sleeve means and the liner; longitudinally space rows of conically shaped, circumferentially spaced segments on said sleeve means, with said segments in one row being offset circumferentially relative to the segments in an adjacent row; longitudinally spaced rows of hanger slips supported on the hanger setting arrangement for longitudinal movement to engage said rows of segments and thereby urge said rows of hanger slips into engagement with the well bore casing for supporting the liner on the well bore casing; means to disconnect the running string from the hanger setting arrangement for relative longitudinal movement therebetween; and means on the running string and liner engageable upon manipulation of the running string to impart rotation to the liner after it is supported on the well bore casing.
5. The liner hanger setting arrangement of claim 4, including piston means responsive to fluid pressure to move said rows of hanger slips into engagement with said rows of segments and the well bore casing.
6. The setting arrangement of claim 4 in cluding means to accommodate longitudinal movement of the liner and running string relative to said rows of hanger slips for engagement of said hanger slips with said rows of segments and the casing.
7. A dual cone liner hanger setting arrangement for lowering with a liner on a running string and a well bore casing to accommodate fluid flow in the well bore casing and rotation of the liner during cementing operations comprising; sleeve means extending longitudinally of the liner; means to accommodate relative rotation between said sleeve means and the liner; longitudinally spaced rows of conically shaped, circumferentially spaced segments on said sleeve means, with said segments in one row being offset circumferentially relative to the segments in an adjacent row; longitudinally spaced rows of hanger slips supported on the hanger setting arrangement for longitudinal movement to engage said rows of segments and thereby urge said rows of hanger slips into engagement with the well bore casing for supporting the liner on the well bore casing; and means operable by manipulation of the running string to impart rotation to the liner after it is supported on the well bore casing.
8. A dual cone liner hanger setting arrangement for lowering with a liner on a running string in a well bore casing to accommodate fluid flow in the well bore casing and rotation of the liner during cementing operations comprising; sleeve means supported on the liner for relative rotation therebetween and having longitudinally spaced rows of circumferentially spaced, conically shaped segments thereon; longitudinally spaced rows of hanger slips supported on the hanger setting arrangement for longitudinal movement to engage said rows of segments and secure said sleeve means to the well bore casing; and means operable by manipulation of the running string to rotate the liner after said sleeve means is secured to the well bore casing.
9. A rotatable liner and liner hanger setting arrangement substantially as hereinbefore described with reference to and as illustrated in the various figures of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65865684A | 1984-10-09 | 1984-10-09 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8431331D0 GB8431331D0 (en) | 1985-01-23 |
| GB2165282A true GB2165282A (en) | 1986-04-09 |
| GB2165282B GB2165282B (en) | 1989-05-17 |
Family
ID=24642128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8431331A Expired GB2165282B (en) | 1984-10-09 | 1984-12-12 | Rotatable liner with multiple simultaneously set liner hanger arrangement and method |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1217716A (en) |
| GB (1) | GB2165282B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2172633A (en) * | 1985-02-28 | 1986-09-24 | Otis Eng Co | Rotating liner hanger and running tool |
| GB2225601A (en) * | 1988-11-25 | 1990-06-06 | Fishing Tools Services Limited | A liner hanger |
| GB2229753A (en) * | 1989-03-16 | 1990-10-03 | Baker Hughes Inc | Hydraulically actuated liner hanger |
| GB2231603A (en) * | 1989-05-12 | 1990-11-21 | Lindsey Completion Systems Inc | Rotatable liner hanger with multiple bearings and cones |
| GB2233995A (en) * | 1989-07-20 | 1991-01-23 | Texas Iron Works | Multiple purpose liner hanger construction |
| GB2245624A (en) * | 1990-06-29 | 1992-01-08 | Baker Hughes Inc | Liner hanger assembly |
| GB2354784A (en) * | 1999-09-30 | 2001-04-04 | Baker Hughes Inc | Liner hanger with plurality of slips |
| US6408945B1 (en) | 1997-02-07 | 2002-06-25 | Weatherford/Lamb, Inc. | Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| US6543533B2 (en) | 2001-03-02 | 2003-04-08 | Duhn Oil Tool, Inc. | Well tubing rotator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965952B (en) * | 2019-12-12 | 2021-10-08 | 中国石油集团渤海钻探工程有限公司 | Telescopic tail pipe seat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1597441A (en) * | 1977-01-10 | 1981-09-09 | Baker Int Corp | Mechanically-hydraulically set liner hangers |
-
1984
- 1984-12-12 GB GB8431331A patent/GB2165282B/en not_active Expired
-
1985
- 1985-01-03 CA CA000471413A patent/CA1217716A/en not_active Expired
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2172633A (en) * | 1985-02-28 | 1986-09-24 | Otis Eng Co | Rotating liner hanger and running tool |
| GB2225601A (en) * | 1988-11-25 | 1990-06-06 | Fishing Tools Services Limited | A liner hanger |
| GB2229753A (en) * | 1989-03-16 | 1990-10-03 | Baker Hughes Inc | Hydraulically actuated liner hanger |
| GB2231603B (en) * | 1989-05-12 | 1992-11-11 | Lindsey Completion Systems Inc | Rotatable liner hanger with multiple bearings and cones |
| GB2231603A (en) * | 1989-05-12 | 1990-11-21 | Lindsey Completion Systems Inc | Rotatable liner hanger with multiple bearings and cones |
| GB2233995A (en) * | 1989-07-20 | 1991-01-23 | Texas Iron Works | Multiple purpose liner hanger construction |
| GB2233995B (en) * | 1989-07-20 | 1992-12-23 | Texas Iron Works | Multiple purpose liner hanger construction |
| GB2245624A (en) * | 1990-06-29 | 1992-01-08 | Baker Hughes Inc | Liner hanger assembly |
| GB2245624B (en) * | 1990-06-29 | 1994-08-17 | Baker Hughes Inc | Liner hanger assembly |
| US6408945B1 (en) | 1997-02-07 | 2002-06-25 | Weatherford/Lamb, Inc. | Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| GB2354784A (en) * | 1999-09-30 | 2001-04-04 | Baker Hughes Inc | Liner hanger with plurality of slips |
| US6431277B1 (en) | 1999-09-30 | 2002-08-13 | Baker Hughes Incorporated | Liner hanger |
| GB2354784B (en) * | 1999-09-30 | 2004-01-14 | Baker Hughes Inc | Liner hanger |
| US6543533B2 (en) | 2001-03-02 | 2003-04-08 | Duhn Oil Tool, Inc. | Well tubing rotator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8431331D0 (en) | 1985-01-23 |
| CA1217716A (en) | 1987-02-10 |
| GB2165282B (en) | 1989-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 775E | Patent revoked (sect. 75/1977) |