Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO1997017525) DEEP WELL FILTERS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/017525 International Application No.: PCT/GB1996/002665
Publication Date: 15.05.1997 International Filing Date: 31.10.1996
Chapter 2 Demand Filed: 20.05.1997
IPC:
B01D 29/11 (2006.01) ,B01D 39/12 (2006.01) ,B01D 39/20 (2006.01) ,E21B 43/08 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
29
Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/-B01D27/170;   Filtering elements therefor
11
with bag, cage, hose, tube, sleeve or like filtering elements
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
39
Filtering material for liquid or gaseous fluids
10
Filter screens essentially made of metal
12
of wire gauze; of knitted wire; of expanded metal
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
39
Filtering material for liquid or gaseous fluids
14
Other self-supporting filtering material
20
of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
43
Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
02
Subsoil filtering
08
Screens or liners
Applicants:
MIXALLOY LIMITED [GB/GB]; Manor Lane Hawarden Deeside Clwyd CH5 3PP, GB (AllExceptUS)
BROOKS, Nigel, John [GB/GB]; GB (UsOnly)
Inventors:
BROOKS, Nigel, John; GB
Agent:
FRY, Alan, Valentine ; Fry Heath & Spence The Old College 53 High Street Horley Surrey RH6 7BN, GB
Priority Data:
9522662.704.11.1995GB
Title (EN) DEEP WELL FILTERS
(FR) FILTRES POUR PUITS PROFOND
Abstract:
(EN) A deep well filter comprises a tubular assembly of at least five superimposed roll bonded and sintered wire mesh layers, the aperture size and wire diameter of any one mesh layer being different from the aperture sizes and wire diameter(s) of its neighbouring mesh layer or layers. In a preferred arrangement, seven steel mesh layers are provided, the aperture size and wire diameter of the first and seventh such layers being the same, those of the second, fourth and sixth layers being the same but different from the first and seventh, and those of the third and fifth layers being different from those of the other five layers. The third and fifth layers may be of the same or different aperture size and wire diameters.
(FR) Filtre pour puits profond comprenant un ensemble tubulaire constitué d'au moins cinq rouleaux superposés, reliés et des couches maillées en fil métallique fritté, l'ouverture de maille et le diamètre du fil de n'importe quelle couche maillée étant différents des ouvertures de maille et du (des) diamètre(s) du fil de la ou des couches maillées voisines. Selon un agencement préféré, sept couches maillées en acier sont ménagées, l'ouverture de maille et le diamètre du fil des première et septième couches étant identiques, ceux des deuxième, quatrième et sixième couches étant identiques entre eux, mais différents des première et septième couches, et ceux des troisième et cinquième couches étant différents de ceux de la cinquième couche. Les troisième et cinquième couches peuvent avoir une ouverture de maille et des diamètres de fil identiques ou différents.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0858549GB2306894AU1996073214