This application is a national stage entry from PCT Application No. PCT/GB2007/002138 filed Jun. 8, 2007, which claims priority to Great Britain Application No. 0611497.9 filed Jun. 9, 2006, the disclosures of which are hereby incorporated by reference in their entireties.
The present invention is directed towards instruments for measuring electromagnetic signals, and particularly, towards instruments for taking measurements at or near the seafloor during electromagnetic surveying, or “Sea Bed Logging”.
Sea Bed Logging methods can be used to detect hydrocarbon reservoirs beneath the sea floor. These methods comprise deploying an electromagnetic source near the sea floor and measuring the response using receiver instruments located at intervals spaced across the sea floor. The receiver instruments may be in the form of long rigid arms carrying electrical sensors, extending from a central body, which facilitates the detection of low level electrical signals in sea water.
The method of deploying existing instruments is as follows: the positively buoyant instrument and an attached concrete anchor are dropped from a survey vessel at a chosen location; the instrument sinks freely to the sea floor; the position of the instrument while sinking is monitored by acoustic methods; the instrument is positioned on the sea floor in a desired location when steady and the instrument is then used to measure and store data while located on the sea floor. After the measurements are complete, acoustic commands from the sea surface cause the instrument to be released from the anchor; the instrument then floats up to the sea surface for retrieval by a survey vessel and the data are extracted from the instrument.
The speed and efficiency of deployment and storage of the receiver instruments affects the overall efficiency of the survey. The mechanical performance of the instruments also affects the survey results. While instruments are known which may be partially disassembled for storage, these require sensor wires to be disconnected from sensors and data loggers when removing the arms for storage. This leads to the requirement for a system to track all the individual arms, sensors and data-loggers, and manage the reconnection back to the correct channel input. Further, a risk of failure or degradation is introduced each time a marine electrical connector is opened and reconnected.
Higher degrees of accuracy in sensor positioning are required for new acquisition techniques, for example, 3D acquisition, as well as being desirable for improving the accuracy of results obtained from other processing techniques. Therefore, there is a need to improve the performance of receiver instruments, in order to improve the accuracy and efficiency with which surveys may be carried out.
The aim of the present invention is to provide a device for detecting electromagnetic signals, which minimises drag when moving through water, and which allows sensors to be positioned with a high degree of accuracy; the device having arms which are thin, strong, stiff horizontally but flexible vertically while measurements are being taken, stiff in use but which can be disassembled without disconnection of wires connecting sensors and data loggers, flexible and unjointed when the instrument is not in use, and which minimise vibrations introduced by underwater currents, among other goals.
According to the present invention, there is provided an electromagnetic signal detecting device, comprising a central housing, a data management system located within the housing, and at least two arms extending outwards from the housing, each arm comprising a flexible elongate sheath attached to the housing, a sensor head, a flexible electrical cable attached to the sheath and connecting the sensor head to the data management system, and a relatively rigid rod which is removably locatable within the sheath, connectable relative to the housing at one end and connectable relative to the sensor head at the end remote from the housing.
During deployment of the device, the rod is located within the sheath, connected relative to the housing and connected relative to the sensor head, whereby the sheath and the flexible electrical cable are held in the same configuration as that of the rod. Preferably, the rod is straight and extends away from the housing, perpendicularly to the point at which it is connected relative to the housing.
Preferably, the rod is connected to a bracket located on the housing. Preferably, each rod is connected to the bracket by a latch connection with a ferrule located at the end of the rod. Preferably, the ferrule is fabricated from metal, more preferably stainless steel.
Preferably, when the device is not in use, for example during storage or transportation, the rod is removed from the sheath and disconnected from the rest of the device. The rod may then be stored separately from the rest of the device. The arm may be stored in a coiled or folded configuration close to the housing, to which the sheath may remain attached. These storage arrangements minimise the storage footprint of the device. The complexity and duration of the preparation of the device for deployment after a period of non-use is also minimised. The preparation simply comprises locating the rod within the sheath and connecting the rod relative to the housing and relative to the sensor head.
Preferably, the housing is cuboid in shape. Preferably, the geometrical center lines of two arms are parallel and extend outwards from opposite points on the perimeter of the housing. Preferably, the arms are approximately horizontal when the device is deployed. Optionally, the device has four arms, comprising two pairs of two parallel arms, with one pair orthogonal to the other.
Preferably, the rod is fabricated from fiber glass. Preferably, the rod is connected to a second similar rod by a connector, to form a twin rod assembly wherein the rods are parallel when the rods are not connected relative to the housing. When the first rod is located within the sheath and connected to the bracket, the second rod is connected to a second bracket located on the IU housing. The second bracket is on the same side wall of the housing and on the same horizontal plane as the first bracket, but spaced as far apart as possible from the first bracket. When connected, the second rod stiffens the arm against horizontal movement and bending, while vertical bending of the arm is not greatly impeded. This enables the horizontal position of the sensor heads to be known with greater accuracy and improves the processing of survey data.
When connected to the brackets, the two rods thus form two sides of an approximate triangle. The ends of the rods are preferably attached into the brackets perpendicularly to the sidewall of the housing from which the arm extends, so the sides of the “triangle” formed by the rods are slightly bent into an “S” shape. This increases the stiffness of the arm and stabilizes the position of the sensor heads. When the instrument is in use on the sea floor, this also minimises horizontal vibrations of the arms caused by water streams near the sea floor. Bending forces prevent certain oscillation modes of the arms which can be introduced in systems having only one rod per arm.
Preferably, the sensor head is attached to the sheath, and is located at the end remote from the housing. Preferably, each sensor head comprises one or more electrical sensors. More preferably, each sensor head comprises two electrical sensors. In the case of failure of one of the electrical sensors in a sensor head, the second sensor can continue to record data.
Preferably, the data management system comprises data loggers and components arranged to control the positioning and release of the device during deployment. Preferably, each electrical sensor is connected to one data logger via the electrical cable connecting the data management system and the sensor head in which the electrical sensor is located.
Optionally, the device also comprises magnetic sensors located in the housing. Optionally, there are two magnetic sensors per electrical sensor.
Optionally, the flexible electrical cable is attached to the sheath by a soft braid. The electrical cable may be attached to the sheath continuously along the length of the arm, or alternatively, it may be attached to the sheath only at certain points spaced along the length of the arm. Alternatively, the electrical cable may be incorporated in the fabric of the sheath.
According to the present invention in its broader sense, there is provided an instrument for detecting electromagnetic signals, having arms comprising two removable rods and a flexible conduit, whereby, while the instrument is in use, the arms are stiff in the horizontal direction and flexible in the vertical direction, and while the instrument is not in use the arm can be disassembled.
Before the instrument is deployed, the arms are made rigid and straight by feeding a rod into the sheath. The rods are then fixed to brackets on the main body of the instrument with individual quick-lock type connections. This assembly process can easily be conducted as a single person operation. When the instrument is not in use, the arms can be disassembled, the rigid rods stored separately and the flexible conduit stored, or coiled, next to the instrument.
The invention may be put into practice in a number of ways and one embodiment is shown here by way of example with reference to the following figures, in which;
According to the embodiment shown in
The instrument also comprises a number of magnetic sensors mounted within the logger frame. The arms enable the position of each electrical sensor relative to a pair of magnetic field sensors to be chosen and accurately maintained.
The arms 104 are rigid when the instrument is in use. Each arm comprises a pair of connected flexible glass fibre rods 102, and when the instrument is in use, one end of each rod is attached into two spaced brackets on the logger frame 100. The space between the two brackets depends on the dimensions of the logger frame and here the two brackets for each arm are positioned at opposite bottom corners of the side of the logger frame to maximise their separation. The other ends of each of the two rods 102 are connected at the sensor head end of the arm.
In each arm, one of the two rods 107 is not located within the sheath, and its main function is to allow the entire arm to be stabilized in the horizontal direction while maintaining flexibility in the vertical direction, when the instrument is in use. The other rod is located in a sheath 103 constructed from a flexible plastics material. The signal wires (not shown) for each arm extend between the electrical sensors and the logger frame, and are fastened along the outside of the sheath, secured by a protective soft braid. The total outer dimension of each arm is thus minimised. In
The vertical flexibility of the arms is important as it allows arms to bend safely when the instrument is sinking towards or rising up from the sea floor. This also minimises drag forces which increases the speed of the sinking or rising stage and reduces overall operation time.
The rod located in the sheath 103 can be removed from the sheath when the instrument is not in use. The sheath can then be coiled and stored beside the logger frame without disconnecting the signal wires and sensors. This minimises the storage space required for the instrument, wear on the electrical equipment and the time required to assemble the instrument before use.
The pairs of glass fibre rods 102 are all of the same dimensions and thus interchangeable. They can be stored separately from the logger frame, also minimising the storage space required.
The mechanical properties of the arms do not affect the measurement system itself. However, the arms enable fixed distances and angles between sensors to be maintained during measurements, thus improving the quality of survey results. The arms also fulfil the function of guiding the signal wires from the sensors to the data logging units in the logger frame.
Number | Date | Country | Kind |
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0611497.9 | Jun 2006 | GB | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/GB2007/002138 | 6/8/2007 | WO | 00 | 3/10/2009 |
Publishing Document | Publishing Date | Country | Kind |
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WO2007/141548 | 12/13/2007 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
1818331 | Jakosky | Aug 1931 | A |
2077707 | Melton | Apr 1937 | A |
2139460 | Potapenko | Dec 1938 | A |
2268106 | Blau | Dec 1941 | A |
2426918 | Barret | Sep 1947 | A |
2531088 | Thompson | Nov 1950 | A |
2766422 | Carbonetto | Oct 1956 | A |
2907389 | Hitzman | Oct 1959 | A |
2919397 | Morley | Dec 1959 | A |
2953742 | Herbold | Sep 1960 | A |
3052836 | Postma | Sep 1962 | A |
3105014 | Harrison | Sep 1963 | A |
3113316 | Berry | Dec 1963 | A |
3114875 | Haagensen | Dec 1963 | A |
3182250 | Conti et al. | May 1965 | A |
3332487 | Jones | Jul 1967 | A |
3398356 | Still | Aug 1968 | A |
3548299 | Duroux et al. | Dec 1970 | A |
3763419 | Barringer | Oct 1973 | A |
3806795 | Morey | Apr 1974 | A |
3819246 | List | Jun 1974 | A |
3836960 | Gehman et al. | Sep 1974 | A |
3959721 | Roschuk et al. | May 1976 | A |
4010413 | Daniel | Mar 1977 | A |
4041372 | Miller et al. | Aug 1977 | A |
4047098 | Duroux | Sep 1977 | A |
4077686 | Bukaitz | Mar 1978 | A |
4079309 | Seeley | Mar 1978 | A |
4094304 | Wright, Jr. | Jun 1978 | A |
4168484 | Wright, Jr. | Sep 1979 | A |
4218678 | Fowler et al. | Aug 1980 | A |
4229809 | Schwalbe | Oct 1980 | A |
4245191 | Schroeder | Jan 1981 | A |
4258321 | Neale, Jr. | Mar 1981 | A |
4258322 | Rocroi et al. | Mar 1981 | A |
4283099 | Burton | Aug 1981 | A |
4296379 | Yoshizumi | Oct 1981 | A |
4298840 | Bischoff et al. | Nov 1981 | A |
4308499 | Thierbach et al. | Dec 1981 | A |
4396885 | Constant | Aug 1983 | A |
4417210 | Rocroi et al. | Nov 1983 | A |
4446434 | Sternberg et al. | May 1984 | A |
4451789 | Meador | May 1984 | A |
4456067 | Pinner | Jun 1984 | A |
4489276 | Yu | Dec 1984 | A |
4492924 | Nilsson | Jan 1985 | A |
4494805 | Washburn | Jan 1985 | A |
4500146 | Peterson | Feb 1985 | A |
4504833 | Fowler et al. | Mar 1985 | A |
4506225 | Loveless et al. | Mar 1985 | A |
4516226 | Peynaud et al. | May 1985 | A |
4547733 | Thoraval | Oct 1985 | A |
4583095 | Peterson | Apr 1986 | A |
4594551 | Cox et al. | Jun 1986 | A |
4616184 | Lee et al. | Oct 1986 | A |
4617518 | Srnka | Oct 1986 | A |
4633182 | Dzwinel | Dec 1986 | A |
4652829 | Safinya | Mar 1987 | A |
4660645 | Newlove | Apr 1987 | A |
4677438 | Michiguchi et al. | Jun 1987 | A |
4698791 | Cunningham | Oct 1987 | A |
4760340 | Denzau et al. | Jul 1988 | A |
4791998 | Hempkins et al. | Dec 1988 | A |
4793664 | Jackson | Dec 1988 | A |
4835473 | Bostick, Jr. | May 1989 | A |
4835474 | Parra et al. | May 1989 | A |
4906575 | Silver et al. | Mar 1990 | A |
4926394 | Doyen | May 1990 | A |
4957172 | Patton et al. | Sep 1990 | A |
4986354 | Cantu | Jan 1991 | A |
4992995 | Favret | Feb 1991 | A |
5025218 | Ramstedt | Jun 1991 | A |
5025222 | Scott et al. | Jun 1991 | A |
5032794 | Ridd et al. | Jul 1991 | A |
5039179 | Chouzenoux | Aug 1991 | A |
5043667 | Schofield | Aug 1991 | A |
5066916 | Rau | Nov 1991 | A |
3990123 | Martinez | Apr 1992 | A |
5103920 | Patton et al. | Apr 1992 | A |
5170440 | Cox | Dec 1992 | A |
5172480 | Labuc et al. | Dec 1992 | A |
5177445 | Cross | Jan 1993 | A |
5185578 | Stolarczykz | Feb 1993 | A |
5192952 | Johler | Mar 1993 | A |
5219386 | Kletzmaier et al. | Jun 1993 | A |
5280284 | Johler | Jan 1994 | A |
5357253 | Van Etten et al. | Oct 1994 | A |
5369892 | Dhaemers | Dec 1994 | A |
5373443 | Lee et al. | Dec 1994 | A |
5400030 | Duren et al. | Mar 1995 | A |
D359403 | Tisbo et al. | Jun 1995 | S |
5421646 | McNamara et al. | Jun 1995 | A |
D361446 | Acard | Aug 1995 | S |
5444619 | Hoskins et al. | Aug 1995 | A |
H1490 | Thompson et al. | Sep 1995 | H |
D362767 | Kelly et al. | Oct 1995 | S |
D366376 | Tisbo et al. | Jan 1996 | S |
D366577 | Tisbo et al. | Jan 1996 | S |
5486764 | Thompson et al. | Jan 1996 | A |
H1524 | Thompson et al. | Apr 1996 | H |
H1561 | Thompson | Jul 1996 | H |
5563513 | Tasci | Oct 1996 | A |
5564806 | Keisling et al. | Oct 1996 | A |
5581024 | Meyer, Jr. et al. | Dec 1996 | A |
5689068 | Locatelli et al. | Nov 1997 | A |
5690401 | Franklin | Nov 1997 | A |
5704142 | Stump | Jan 1998 | A |
5724309 | Higgs et al. | Mar 1998 | A |
5767679 | Schroder | Jun 1998 | A |
5770945 | Constable | Jun 1998 | A |
5777478 | Jackson | Jul 1998 | A |
5798892 | Kobayashi et al. | Aug 1998 | A |
5811973 | Meyer, Jr. | Sep 1998 | A |
5825188 | Montgomery et al. | Oct 1998 | A |
5838634 | Jones | Nov 1998 | A |
5841280 | Yu et al. | Nov 1998 | A |
5877995 | Thompson et al. | Mar 1999 | A |
5886526 | Wu | Mar 1999 | A |
5892361 | Meyer, Jr. et al. | Apr 1999 | A |
5894450 | Schmidt et al. | Apr 1999 | A |
5901795 | Tsao et al. | May 1999 | A |
5905380 | Weiner et al. | May 1999 | A |
5905657 | Celniker | May 1999 | A |
5940777 | Keskes | Aug 1999 | A |
5955884 | Payton et al. | Sep 1999 | A |
5987388 | Crawford et al. | Nov 1999 | A |
5996414 | Mercado | Dec 1999 | A |
6002357 | Redfern et al. | Dec 1999 | A |
6005916 | Johnson et al. | Dec 1999 | A |
6011557 | Keskes et al. | Jan 2000 | A |
6023168 | Minerbo | Feb 2000 | A |
6026913 | Mandal et al. | Feb 2000 | A |
6041018 | Roche | Mar 2000 | A |
6049760 | Scott | Apr 2000 | A |
6060884 | Meyer, Jr. et al. | May 2000 | A |
6060885 | Tabarovsky et al. | May 2000 | A |
6061412 | Stucker et al. | May 2000 | A |
6087833 | Jackson | Jul 2000 | A |
6101448 | Ikelle et al. | Aug 2000 | A |
6108605 | Doyle et al. | Aug 2000 | A |
6114972 | Smith | Sep 2000 | A |
6140819 | Peterman et al. | Oct 2000 | A |
6157195 | Vail, III | Dec 2000 | A |
6163155 | Bittar | Dec 2000 | A |
6181138 | Hagiwara et al. | Jan 2001 | B1 |
6184685 | Paulk et al. | Feb 2001 | B1 |
6188221 | Van de Kop et al. | Feb 2001 | B1 |
6188222 | Seydoux et al. | Feb 2001 | B1 |
6225806 | Millar et al. | May 2001 | B1 |
6236211 | Wynn | May 2001 | B1 |
6236212 | Wynn | May 2001 | B1 |
6246240 | Vail, III | Jun 2001 | B1 |
6294917 | Nichols | Sep 2001 | B1 |
6339333 | Kuo | Jan 2002 | B1 |
6389360 | Alft et al. | May 2002 | B1 |
6415231 | Hebert | Jul 2002 | B1 |
6424918 | Jorgensen et al. | Jul 2002 | B1 |
6450599 | Mamuyac | Sep 2002 | B1 |
6480000 | Kong et al. | Nov 2002 | B1 |
6499817 | Jermain | Dec 2002 | B2 |
6573855 | Hayakawa et al. | Jun 2003 | B1 |
6628119 | Eidesmo et al. | Sep 2003 | B1 |
6662147 | Fournier et al. | Dec 2003 | B1 |
6696839 | Ellingsrud et al. | Feb 2004 | B2 |
6700526 | Witten | Mar 2004 | B2 |
6717411 | Ellingsrud et al. | Apr 2004 | B2 |
6826483 | Anderson et al. | Nov 2004 | B1 |
6834732 | Haarstad | Dec 2004 | B2 |
6842006 | Conti et al. | Jan 2005 | B2 |
6859038 | Ellingsrud et al. | Feb 2005 | B2 |
6864684 | Ellingsrud et al. | Mar 2005 | B2 |
6900639 | Ellingsrud et al. | May 2005 | B2 |
6917564 | Leaney | Jul 2005 | B2 |
6950786 | Sonneland et al. | Sep 2005 | B1 |
6950790 | Nichols | Sep 2005 | B1 |
7026819 | Eidesmo et al. | Apr 2006 | B2 |
7028806 | Dubinsky et al. | Apr 2006 | B2 |
7032707 | Egerev et al. | Apr 2006 | B2 |
7038456 | Ellingsrud et al. | May 2006 | B2 |
7038850 | Chang et al. | May 2006 | B2 |
7042802 | Sinha | May 2006 | B2 |
7072767 | Routh et al. | Jul 2006 | B2 |
7095357 | Johler | Aug 2006 | B1 |
7106065 | Graf | Sep 2006 | B1 |
7123543 | Vaage et al. | Oct 2006 | B2 |
7126338 | MacGregor et al. | Oct 2006 | B2 |
7145341 | Ellingsrud et al. | Dec 2006 | B2 |
7149672 | Torkildsen | Dec 2006 | B2 |
7202669 | Ellingsrud et al. | Apr 2007 | B2 |
7319330 | Amundsen | Jan 2008 | B2 |
7423432 | Amundsen | Sep 2008 | B2 |
7471089 | Helwig et al. | Oct 2009 | B2 |
7613570 | Rosten et al. | Nov 2009 | B2 |
664603 | Rosten | Feb 2010 | A1 |
7664603 | Rosten | Feb 2010 | B2 |
7919965 | Schaug-Pettersen et al. | Apr 2011 | B2 |
8086426 | El Ouair et al. | Dec 2011 | B2 |
20030048105 | Ellingsrud et al. | Mar 2003 | A1 |
20030050759 | Srnka et al. | Mar 2003 | A1 |
20030052685 | Ellingsrud et al. | Mar 2003 | A1 |
20040000912 | Conti et al. | Jan 2004 | A1 |
20040003511 | Silver | Jan 2004 | A1 |
20040017137 | Straub | Jan 2004 | A1 |
20040027130 | Ellingsrud et al. | Feb 2004 | A1 |
20040046568 | Unsworth et al. | Mar 2004 | A1 |
20040090234 | Macune | May 2004 | A1 |
20040176910 | Ellingsrud et al. | Sep 2004 | A1 |
20050035696 | Parise et al. | Feb 2005 | A1 |
20050040742 | Tsai | Feb 2005 | A1 |
20050264294 | Constable | Dec 2005 | A1 |
20060005965 | Chouzenoux et al. | Jan 2006 | A1 |
20060038570 | Constable | Feb 2006 | A1 |
20060091889 | Ellingsrud et al. | May 2006 | A1 |
20060103387 | Amundsen | May 2006 | A1 |
20060202697 | Sodal | Sep 2006 | A1 |
20070145980 | Conti et al. | Jun 2007 | A1 |
20070150201 | Eidesmo et al. | Jun 2007 | A1 |
20070294036 | Strack et al. | Dec 2007 | A1 |
20080065330 | Rosten et al. | Mar 2008 | A1 |
20080122444 | Schaug-Pettersen et al. | May 2008 | A1 |
20080169817 | Morrison et al. | Jul 2008 | A1 |
20080189043 | Anno et al. | Aug 2008 | A1 |
20080195358 | El Ouair et al. | Aug 2008 | A1 |
20080221795 | Amundsen et al. | Sep 2008 | A1 |
20090134877 | Schaug-Pettersen | May 2009 | A1 |
20090195251 | Darnet et al. | Aug 2009 | A1 |
20090243617 | Farrelly et al. | Oct 2009 | A1 |
20090265111 | Helwig et al. | Oct 2009 | A1 |
20090267608 | Johnstad et al. | Oct 2009 | A1 |
20090271118 | Saltzer et al. | Oct 2009 | A1 |
20100045295 | Mittet et al. | Feb 2010 | A1 |
20100052688 | Schaug-Pettersen | Mar 2010 | A1 |
20100057363 | Amundsen | Mar 2010 | A1 |
20100061187 | Sodal | Mar 2010 | A1 |
Number | Date | Country |
---|---|---|
0087271 | Aug 1983 | EP |
0215695 | Mar 1987 | EP |
0219234 | Apr 1987 | EP |
0368762 | May 1990 | EP |
0512756 | Nov 1991 | EP |
0 481 886 | Apr 1992 | EP |
0568612 | Mar 1996 | EP |
0814349 | Dec 1997 | EP |
1094338 | Apr 2001 | EP |
1253437 | Oct 2002 | EP |
1253443 | Oct 2002 | EP |
1255126 | Nov 2002 | EP |
1512033 | Dec 2003 | EP |
1309887 | Mar 2004 | EP |
1256019 | Jun 2004 | EP |
2479992 | Oct 1981 | FR |
2586302 | Feb 1987 | FR |
188676 | Dec 1922 | GB |
1342475 | Jan 1974 | GB |
1588495 | Apr 1981 | GB |
2089043 | Jun 1982 | GB |
2155182 | Sep 1985 | GB |
2197078 | May 1988 | GB |
2197952 | Jun 1988 | GB |
220070 | Dec 1989 | GB |
2220071 | Dec 1989 | GB |
2231602 | Nov 1990 | GB |
2256715 | Dec 1992 | GB |
2296567 | Jul 1996 | GB |
2301902 | Dec 1996 | GB |
2323443 | Sep 1998 | GB |
2333364 | Jul 1999 | GB |
2355538 | Apr 2001 | GB |
2382875 | Jul 2001 | GB |
2364390 | Jan 2002 | GB |
2384068 | Jul 2003 | GB |
2385923 | Sep 2003 | GB |
2390904 | Jan 2004 | GB |
2 391 946 | Feb 2004 | GB |
2395563 | May 2004 | GB |
2399640 | Sep 2004 | GB |
2404444 | Feb 2005 | GB |
2411006 | Aug 2005 | GB |
2413187 | Oct 2005 | GB |
2413188 | Oct 2005 | GB |
2415511 | Dec 2005 | GB |
2421800 | Jul 2006 | GB |
2 425 182 | Oct 2006 | GB |
2002 244580 | Aug 2002 | JP |
2006 145 360 | Jun 2006 | JP |
WO 8101617 | Jun 1981 | WO |
WO 8910463 | Nov 1989 | WO |
WO 9000749 | Jan 1990 | WO |
WO 9213172 | Aug 1992 | WO |
WO 9215771 | Sep 1992 | WO |
WO 9215900 | Sep 1992 | WO |
WO 9420864 | Sep 1994 | WO |
WO 9606367 | Feb 1996 | WO |
WO 9633426 | Oct 1996 | WO |
WO 9635859 | Nov 1996 | WO |
WO 9733184 | Sep 1997 | WO |
WO 9811455 | Mar 1998 | WO |
WO 9828638 | Jul 1998 | WO |
WO 9913966 | Mar 1999 | WO |
WO 0000850 | Jan 2000 | WO |
WO 0013037 | Mar 2000 | WO |
WO 0013046 | Mar 2000 | WO |
WO 0054075 | Sep 2000 | WO |
WO 0063718 | Oct 2000 | WO |
WO 0120366 | Mar 2001 | WO |
WO 0133481 | May 2001 | WO |
WO 0155749 | Aug 2001 | WO |
WO 0157555 | Aug 2001 | WO |
WO 0214906 | Feb 2002 | WO |
WO 03034096 | Apr 2003 | WO |
WO 03036331 | May 2003 | WO |
WO 03042718 | May 2003 | WO |
WO 03048737 | Jun 2003 | WO |
WO 03048812 | Jun 2003 | WO |
WO 03100467 | Dec 2003 | WO |
WO 03104844 | Dec 2003 | WO |
WO 0142818 | Jun 2004 | WO |
WO 2004053528 | Jun 2004 | WO |
2004083898 | Sep 2004 | WO |
WO 2007018810 | Feb 2007 | WO |
Number | Date | Country | |
---|---|---|---|
20100231223 A1 | Sep 2010 | US |