EP0968384A2 - Valve lock and adapter - Google Patents
Valve lock and adapterInfo
- Publication number
- EP0968384A2 EP0968384A2 EP98912615A EP98912615A EP0968384A2 EP 0968384 A2 EP0968384 A2 EP 0968384A2 EP 98912615 A EP98912615 A EP 98912615A EP 98912615 A EP98912615 A EP 98912615A EP 0968384 A2 EP0968384 A2 EP 0968384A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- valve
- latch
- key
- hub
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
- F16K35/06—Means to prevent accidental or unauthorised actuation using a removable actuating or locking member, e.g. a key
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
Definitions
- the present invention relates to a valve lock for locking a valve spindle in a selected position relative to a valve body, and to an adapter for interengaging for example a valve lock assembly and a valve spindle.
- Valve locks are required to provide a means for locking a rotatable valve spindle in a pre-determined position. For example, in industrial installations in which potentially hazardous fluids are pumped through process equipment, it is often necessary to secure a series of valves in a particular configuration. Valves are locked both to prevent unauthorised operation and. where a series of valves are interlocked, to prevent the sequential operation of a series of valves in a potentially dangerous manner. In an interlocked system, there may be for example three valves which must be opened in a pre-determined sequence.
- valve spindle position indicating mechanism which prevents key removal until the valve spindle has been rotated to a pre-determined axial and rotational position.
- Such mechanisms are often referred to as "counters'" as in effect it is necessary to pre-set the position of the spindle at which the key is to be released, to count rotations of the spindle away from that initial position, and then to count rotations of the spindle back to the initial position.
- rotation of the valve spindle is tracked by the counting mechanism such that when the valve spindle is returned to its initial position the valve position counting mechanism indicates that this is the case and releases the key.
- valve position indicator systems of known valve locks Another problem with the valve position indicator systems of known valve locks is that once they have been set. during installation, they are very difficult to reset. This is a severe problem in circumstances where over time the valve spindle position corresponding to the valve being fully closed changes. Such changes often occur as the result of compression over time of valve seals. For example, in a new installation, when the valve is fully closed by applying an appropriate torque to a hand wheel actuator, the valve spindle rotates until resilient valve seals are compressed to an extent sufficient to resist that applied torque. Over time, as the valve seals age and are subjected to repeated compression and relaxation, the same applied torque could result in the valve spindle being turned several times beyond the initial "fully closed” position. Thus if the locking mechanism is not reset, a valve which is locked in the "fully closed” condition may in fact be several turns away from being fully closed. Potentially dangerous leakage can therefore occur through a valve which is nominally fully closed.
- valve spindle In a conventional valve lock, the valve spindle is interengaged with a hub of the lock mechanism such that rotation of the hub is directly coupled to the spindle.
- this interengagement is achieved by fitting a customised body between the spindle and the hub, the body defining a bore the cross-section of which is machined to match the cross-section of the valve spindle and having an outer periphery defining two slots which receive mating ribs on the hub.
- the interengaging body has to be designed to fit a particular spindle cross-section and therefore the installer has to know in advance of installation the detailed geometry of the valve spindle.
- valve structure has to be prepared for the installer and valve locks cannot be reliably fitted without such advance information.
- valve lock must be mounted in a pre-determined orientation on the valve body, and must be interengaged with the valve spindle once the valve has been fully closed, it is sometimes necessary to partially open the valve by rotating the spindle back from its fully closed position until the spindle is in a position in which it can be inserted in the bore in the interengaging body mounted in the hub.
- a valve lock for locking a valve spindle in a selected position relative to a valve body, comprising a housing which in use is mounted on the valve body, a spindle engaging member which rotates with the valve spindle relative to the housing, a latch which is actuable by a key to assume a latched condition in which rotation of the spindle engaging member relative to the housing is permitted in one direction but prevented in the other direction, and a spindle position indicator coupled by a transmission to the spindle engaging member so as to be displaced as a result of rotation of the spindle, wherein the spindle position indicator prevents actuation of the latch by the key except when the spindle position indicator is in a pre-determined orientation, the spindle position indicator is locked in the pre-determined orientation when the latch has been actuated by the key, and the transmission incorporates a slip clutch which enables rotation of the spindle engaging member in the said one direction if the spindle position indicator is locked in the pre-determined
- initial setting of the spindle position indicator upon installation can be readily achieved by locking the indicator and then relying upon the ratchet-like latch to enable movement of the spindle to a desired "set" position.
- a user of such a valve lock turns the valve spindle to an extreme position and discovers that the valve lock is not operable in that extreme position, the valve can simply be rotated back to a position at which the lock can be operated, and then advanced again after the spindle position indicator has been locked in position.
- the spindle position indicator can then be released once the valve has reached its extreme position, the indicator thus having been reset automatically without physical intervention by the user other than a simple manipulation of the valve lock key and rotation of the valve spindle.
- slip clutch is used herein to mean any mechanical device which can be incorporated in the transmission so as to normally faithfully transmit rotation of the spindle to displacement of the position indicator but which enables relative slippage between them when the position indicator is locked and a sufficient torque is applied to the spindle.
- the transmission may comprise a first sprocket driven by formations supported on the spindle engaging member and a second sprocket in driving engagement with the spindle position indicator, the slip clutch being located between the first and second sprockets such that the first sprocket can rotate relative to the second if sufficient torque is applied.
- the second sprocket may comprise two sets of axially spaced teeth and the spindle position indicator may comprise two axially spaced coaxial sprockets meshing with respective sets of teeth, actuation of the latch being prevented unless both the first and second spindle position indicator sprockets are in pre-determined rotational positions, the number of teeth in the sets of teeth and the number of teeth in the first and second spindle position indicator sprockets being selected to prevent actuation of the latch at more than one position of the spindle.
- the housing is provided with a viewing window through which portions of the coaxial sprockets are visible, one or more of the sprockets carrying a marker to indicate when the sprockets are in the pre-determined rotational positions.
- the first and second spindle position indicator sprockets may define slots which are aligned with key displaceable members only when the sprockets are in the pre-determined relative positions, the slots when so aligned permitting rotation of the key displaceable members, and rotation of the key displaceable members also causing actuation of the latch.
- the key displaceable members may be mounted to extend radially from a shaft which extends between two flanges in which the slots are defined, the shaft being rotatable about its major axis by the key.
- the shaft may bear against the latch and be shaped such that rotation of the shaft to a position in which the key displaceable members are engaged in the slots actuates the latch.
- the shaft may support an indicator which is visible when the shaft is rotated to the position in which the key displaceable members are engaged in the slots.
- the slip clutch preferably comprises first and second members, surfaces of which are biased together by a spring, the surfaces being non-planar such that relative movement between them requires relative displacement between the two members and compression of the spring.
- the two surfaces may define mating peaks and troughs.
- two spindle position indicators and two latches are arranged such that one latch when actuated prevents rotation of the spindle engaging member in one direction and the other latch when actuated prevents rotation of the spindle engaging member in the other direction, each spindle position indicator being coupled to the spindle engaging member by a respective transmission incorporating a respective slip clutch. This enables the valve lock to be secured at two spindle positions.
- the spindle engaging member supports an annular array of teeth and the or each latch comprises a pivotal lever which is biased to a first position in which it engages the teeth and is moveable by the key to a second position in which it is spaced from the teeth, the lever being arranged such that when in the first position rotation of the teeth in one direction is permitted but rotation in the opposite direction is prevented as a result of the lever jamming an engagement with the teeth.
- a latch override member is preferably provided which may be driven into the housing to move the latch to the second position, means being provided to retain the driven member within the housing to indicate that the latch has been overridden.
- the spindle engaging member defines a socket uniform, non-circular cross- section in planes perpendicular to an axis about which the spindle is rotatable, and the plurality of plates are engaged between the socket and spindle, each plate defining a peripheral edge which is shaped to fit the socket cross-section in each of the plurality of rotational positions relative to the spindle axis, and each plate defining an opening having a straight edge positioned relative to the plate to abut a plane surface defined by the spindle.
- the present invention also provides a valve spindle adapter assembly comprising a housing which in use is mounted on a valve body from which extends a spindle that is rotatable relative to the valve body about a pre-determined axis, a hub mounted on the housing so as to be rotatable about the spindle axis, and means for inter-engaging the hub and the spindle such that the hub and spindle rotate together, the spindle extending into a socket defined by the hub, and the socket being of uniform non-circular cross-section in planes perpendicular to the spindle axis, wherein the means for inter-engaging the hub and spindle comprises a plurality of plates each defining a peripheral edge which is shaped to fit the socket cross-section in each of a plurality of rotational positions relative to the spindle axis, each plate defining an opening having a straight edge positioned to abut said one planar surface of the spindle.
- Figure 1 is a plan view of the embodiment of the invention after removal of a housing cover
- Figure 2 is plan view of a housing cover which in use is mounted on the assembly as illustrated in Figure 1;
- Figure 3 shows a latch which is shown in Figure 1 in an alternative position
- Figure 4 illustrates the end of a key-actuated shaft which is incorporated in the embodiment of Figure 1 ;
- FIGs 4 to 8 illustrate the detailed structure of a transmission component of the assembly shown in Figure 1.
- Figure 9 illustrates component parts of a spindle position indicator shown in Figure 1.
- Figure 10 illustrates the inter-relationship between the spindle position indicator described with reference to Figure 9 and the transmission described with reference to Figures 5 to 8;
- Figure 12 is a plan view of a plate which may be used with the arrangement shown in Figure 1 to interengage a valve spindle and a locking mechanism hub;
- Figure 13 shows the use of plates as shown in Figure 12 to interengage a hexagonal section spindle;
- Figure 14 shows the use of plates as shown in Figure 12 to interengage a square section spindle and the illustrated embodiment of the invention.
- valve lock in accordance with the present invention is shown after removal of a cover plate which is shown in Figure 2.
- the illustrated valve lock is clamped in any convenient manner to the body of a valve to be controlled (not shown) such that a spindle of the valve extends into and is engaged by the assembly. Only the spindle of the valve is shown in Figure 1.
- the valve lock comprises a housing 1 which is clamped to the valve body, an annular valve spindle engaging member or hub 2, a transmission 3 which engages the hub 2 so as to be driven in rotation thereby, a first spindle position indicator 4 which is coupled to the transmission 3, and a second spindle position indicator 5 which is also coupled to the transmission 3.
- the indicator 4 interacts with a locking shaft 6 controlled by a key 7 and the indicator 5 interacts with a locking shaft 8 controlled by a key 9.
- the mechanism is arranged such that the valve spindle can be locked in either of two predetermined positions, one of which is determined by indicator 4 and the other of which is determined by indicator 5.
- the position determined by indicator 4 corresponds in the case of the illustrated valve lock to a position in which a valve spindle 10 engaged by the illustrated assembly has been turned as far as possible in a clockwise direction so as to close the valve.
- the position determined by indicator 5 corresponds to the opposite case, that is the valve spindle having been turned as far as possible in the anti-clockwise direction to the fully open condition.
- the outer surface of the hub 2 supports two axially spaced rings each defining twenty one teeth 13, the teeth of one ring being aligned with the teeth of the other.
- Three pins 14 extend across the axial gap between the two rings of teeth 13, the pins 14 driving the transmission 3.
- Latches 15 and 16 are biased by springs 17 into engagement with the outer surface of the hub so as to define two ratchet mechanisms with the teeth 13.
- the hub 2 In the position of the latches 15 and 16 shown in Figure 1. the hub 2 is free to rotate in both directions.
- Each of the latches is pivotal from the positions shown in Figure 1 into engagement with the adjacent teeth 13, Figure 3 showing the position of the latch 16 after it has been so displaced. With the latch 15 in the position shown in Figure 1 and the latch 16 in the position shown in Figure 3, the hub 2 could be rotated in the anti-clockwise direction but not in the clockwise direction, and vice-versa.
- the end of the shaft 8 remote from the key 9 is supported in an upstanding plate 18 through which it projects into engagement with one end of the latch 16. Rotation of the shaft 8 through 90° about its major axis as a result of rotation of the key 9 enables the latch 16 to move between the positions shown for that component in Figures 1 and 3. It will be seen from Figures 1 and 4 that the end of the shaft 8 defines a recess 19 which, when the shaft 8 has been rotated to the position shown in Figure 3, is aligned with a pin 20 mounted in a tube 21 supported on the housing 1. Thus if the shaft 8 and latch 16 are in the position shown in Figure 3, the latch can be displaced to the position shown in Figure 1 by driving the pin 20 into the housing.
- a locked open valve can be released by driving in the pin 20 to override the locking mechanism.
- An indicator device 22 is mounted on the pin 20 so as to be snapped off when the pin is driven in, thereby making it possible to see when the pin 20 has been displaced.
- a clip 23 is retained in slots cut in the tube 21 and, in the position of the pin shown in Figure 1, engages in a groove formed in the pin 20.
- the shaft 8 supports a plate 25 which as described below is used to lock the indicator 5. In the position of the key 9 and shaft 8 shown in Figure 1, the plate 25 is in a position in which it does not obstruct rotation of the indicator 5. Rotation of the shaft 8 through 90° to the position shown in Figure 3 would however enable the plate 25 to engage in slots provided in the indicator as described below.
- the shaft 8 also supports an indicator plate 26 which adopts the position shown in broken lines in Figure 1 when the key 9 is turned clockwise, and which would be visible beneath an indicator window 27 (the position of which is shown in broken lines 27 in Figure 1 and is shown in full in Figure 2) when the key 9 is rotated in the anti-clockwise direction.
- the shaft 6 supports a plate 28 and indicator 29 and can be engaged by a release pin 30 in exactly the same manner as the shaft 8 supports the plate 25 and indicator 26 and interacts with the pin 20.
- a viewing window 31 is also provided above the shaft 6.
- FIG. 5 to 8 illustrate the structure of the transmission 3 of Figure 1.
- the transmission comprises six components, that is a central section 32. an upper section 33 supporting eight upper teeth 34 and nine lower teeth 35, a lower section 36 supporting nine upper teeth 37 and eight lower teeth 38, upper and lower cam members 39 and 40 which are slidably received within the central section 32, and a compression spring 41 which is located within the central section 32 and biases the cam members 39 and 40 apart.
- the cam members 39 and 40 are hexagonal to fit within a hexagonal passage within the central section 32 and each define ramp surfaces 42 which mate with ramp surfaces 43 defined on the upper and lower sections 33 and 36 respectively. Each of the ramp surfaces defines three peaks separated by troughs such that for example components 33 and 39 normally assume one of three relative orientations.
- the central section 32 supports a sprocket 44 which engages with the pins 14 ( Figure 1).
- the sprocket 44 of the central section comprises nine teeth.
- the central section 32 and the end sections 33 and 36 rotate as a single body.
- a single rotation of the hub 2 of Figure 1 drives the three pins 14 past the transmission, causing the central section 32 to rotate through 120°.
- the structure of the spindle position indicator 4 is shown in Figure 9.
- the structure of the spindle position indicator 5 of Figure 1 is identical to that illustrated in Figure 9 except for the fact that the mechanism is inverted.
- Figure 10 shows the inter-relationship between the transmission 3 and the position indicators 4 and 5.
- each of the position indicators comprises a shaft 45 supporting a nine-tooth sprocket 46 which is secured to a member 47 so as to rotate therewith.
- the member 47 defines a radially extending flange 48.
- Journalled on the shaft 45 is a central sprocket assembly comprising an eight-tooth sprocket 49 and a radially extending flange 50.
- a space is defined between the flanges 48 and 50, that space accommodating the sprocket 44 of the transmission assembly.
- the space defined between the sprockets 48 and 50 also receives the shaft 6 or 8 of the key actuated assembly.
- FIG 11 represents a plan view of the two position indicators 4 and 5 of Figure 1.
- the flanges 48 and 50 define slots 51 and 52 which in a single pre-determined orientation of the slots 51 and 52 are aligned with the plates 28 and 25 mounted on the shafts 6 and 8.
- the plates are dimensioned such that when they project perpendicular to the planes defined by the flanges 48 and 50, as illustrated in the case of indicator 4 in Figure 1 1, they project into the slots 51 and 52. thereby preventing rotation of flanges 48 and 50 and the sprockets 46 and 49.
- valve lock described with reference to Figures 1 to 11 can be readily mounted on a valve so as to enable that valve to be locked in both fully open and fully closed position.
- the assembly would normally be delivered with both of the indicators 4 and 5 locked, that is with the indicator 4 and 5 in the position shown in Figure 11 but with the shaft 8 rotated through 90° as compared with the position shown in Figure 11. Once installed, this relative configuration of the two indicators would not occur again.
- the valve spindle Prior to mounting the assembly on a valve, the valve spindle would be fully closed by turning the spindle as far as possible in a clockwise direction.
- the housing 1 would then be clamped to the valve body, the hub 2 would be interengaged with the spindle 10 as described in detail below, and the key 7 would be rotated to the position shown in Figure 1 to enable anti-clockwise rotation of the hub 2.
- the hub 2 would then be rotated until the valve was in the fully open position, the latch 16 and the teeth 13 operating in the manner of a ratchet and pawl.
- Rotation of the hub 2 in the anti-clockwise direction drives the transmission 3 which in turn drives the indicator 4.
- the indicator 5 remains locked however and one of the clutch mechanisms in the transmission 3 enables the sprocket 44 to rotate without rotating the indicator 5.
- the valve can be opened or closed at will. If it is desired to lock the valve in the fully closed position, the spindle is rotated as far as possible in a clockwise direction, thereby returning the left hand indicator 4 to its initial condition in which the shaft 6 can be rotated to lock the flanges 48 and 50 together. Rotation of the shaft also causes the latch 15 to engage, thereby preventing anti-clockwise rotation of the spindle to reopen the valve. Similarly, if it is desired to lock the valve in the open position, this can be achieved by fully opening the valve and then turning the key 9.
- the keys 7 and 9 are captive except when the associated shaft 6 or 8 has been rotated to engage the respective latch 15 or 16.
- the levers 26 and 29 are visible through the windows 27 and 31 and thereby enable a user to readily identify whether or not the shafts 6 and 8 have been rotated to the locked condition.
- one or both of the sprockets 46 and 49 of indicator 4 can carry for example a fluorescent or other visible marker to indicate when the slots 51 and 52 have been aligned to enable rotation of the shaft 6.
- a marker or markers may also be provided on the flange 48 of indicator 5 for a similar reason.
- FIG 12 is a simple plan view of a plate 53 which may be used to interengage the hub 2 and spindle 10 of Figure 1.
- the plate is in the form of a simple sheet 54 of steel into which a slot 54 has been cut with arcuate end edges 55 and parallel side edges 56.
- the peripheral edge 57 of the plate is hexagonal and may therefore be positioned in one of twelve positions relative to the hub 2 of Figure 1.
- the spindle 10 will adopt a rotational position relative to the hub 2 which cannot be accurately predicted.
- a plate 53 as shown in Figure 12 in which the edges 56 are spaced by the distance between the opposed faces of the hexagonal spindle shaft may however be placed in the socket defined by the hub 2 in any one of twelve orientations and therefore the hub 2 and spindle 10 may be readily interengaged in a position which at most requires relative rotation between the spindle and the shaft of 1/24 of a full revolution, that is 15°.
- a spindle may not be known in advance. However, a relatively limited range of plates 54 will be sufficient to enable all spindle shapes and sizes to be accommodated. The only variable that would be of relevance would be the spacing between
- a single latch, transmission and position indicator could be provided to lock a valve in only one of its extreme positions.
- the illustrated arrangement could be set up to lock a valve in one extreme position and an intermediate position in which for example the valve is half open. This could be achieved by removing the latching mechanism provided for locking in one extreme position, and extending one or both of the slots in the two parts of the associated position indicator mechanism. With such modifications, the device would still enable ready resetting of the extreme position in which the valve can be locked shut.
- a further key operated lock mechanism could be provided on the side of the housing remote from the two keys of the illustrated embodiment so as to directly engage the hub. With such an arrangement a supervisor could for example prevent any manipulation of the valve spindle. It will be appreciated that the housing could incorporate sensing devices capable of generating an electrical signal indicative of the valve lock condition to enable the signalling of that condition to a remote location.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Preventing Unauthorised Actuation Of Valves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9706015.6A GB9706015D0 (en) | 1997-03-22 | 1997-03-22 | Valve lock and adapter |
GB9706015 | 1997-03-22 | ||
PCT/GB1998/000877 WO1998042937A2 (en) | 1997-03-22 | 1998-03-23 | Valve lock and adapter |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0968384A2 true EP0968384A2 (en) | 2000-01-05 |
Family
ID=10809728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98912615A Withdrawn EP0968384A2 (en) | 1997-03-22 | 1998-03-23 | Valve lock and adapter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0968384A2 (en) |
AU (1) | AU6739598A (en) |
GB (1) | GB9706015D0 (en) |
WO (1) | WO1998042937A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUD20110067A1 (en) * | 2011-04-29 | 2012-10-30 | Emmeti Spa | COMMAND DEVICE FOR AN INTERCEPTION OF A FLUID, AND INTERCEPTION ORGAN |
CN113790279B (en) * | 2021-09-10 | 2022-05-06 | 绍兴柯桥春生水务科技有限公司 | Multifunctional fire valve with anti-theft function |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2438005A1 (en) * | 1974-08-07 | 1976-02-19 | Stahl Armaturen Persta Gmbh Kg | Gate valve locking device - locates in top part of two part valve shaft coupling for positive operation |
GB8500923D0 (en) * | 1985-01-15 | 1985-02-20 | Ellis A E H | Lockable drive mechanism |
EP0197660A1 (en) * | 1985-04-03 | 1986-10-15 | Proven Engineering Products Limited | Lock Mechanism |
GB2254103B (en) * | 1991-03-18 | 1996-01-24 | Joseph Philip Morrison | Key mechanism |
-
1997
- 1997-03-22 GB GBGB9706015.6A patent/GB9706015D0/en active Pending
-
1998
- 1998-03-23 AU AU67395/98A patent/AU6739598A/en not_active Abandoned
- 1998-03-23 WO PCT/GB1998/000877 patent/WO1998042937A2/en not_active Application Discontinuation
- 1998-03-23 EP EP98912615A patent/EP0968384A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9842937A2 * |
Also Published As
Publication number | Publication date |
---|---|
AU6739598A (en) | 1998-10-20 |
GB9706015D0 (en) | 1997-05-07 |
WO1998042937A3 (en) | 1998-12-23 |
WO1998042937A2 (en) | 1998-10-01 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FOSTER, STEPHEN, LESLIE Inventor name: WADSWORTH, MARTIN, JAMES |
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