FR2424756A1 - Filtre de metal poreux - Google Patents
Filtre de metal poreuxInfo
- Publication number
- FR2424756A1 FR2424756A1 FR7813147A FR7813147A FR2424756A1 FR 2424756 A1 FR2424756 A1 FR 2424756A1 FR 7813147 A FR7813147 A FR 7813147A FR 7813147 A FR7813147 A FR 7813147A FR 2424756 A1 FR2424756 A1 FR 2424756A1
- Authority
- FR
- France
- Prior art keywords
- filter
- grains
- relatively large
- relatively
- porous metal
- 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
- 239000002184 metal Substances 0.000 title abstract 3
- 238000011144 upstream manufacturing Methods 0.000 abstract 2
- 239000012528 membrane Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 238000001223 reverse osmosis Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0039—Inorganic membrane manufacture
- B01D67/0046—Inorganic membrane manufacture by slurry techniques, e.g. die or slip-casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/111—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2027—Metallic material
- B01D39/2031—Metallic material the material being particulate
- B01D39/2034—Metallic material the material being particulate sintered or bonded by inorganic agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/108—Inorganic support material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/022—Metals
- B01D71/0223—Group 8, 9 or 10 metals
- B01D71/02232—Nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1103—Making porous workpieces or articles with particular physical characteristics
- B22F3/1109—Inhomogenous pore distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/114—Making porous workpieces or articles the porous products being formed by impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/18—Specific valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/28—Pore treatments
- B01D2323/283—Reducing the pores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Filtering Materials (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Powder Metallurgy (AREA)
Abstract
LA PRESENTE INVENTION CONCERNE UN FILTRE POREUX SOUS FORME DE GRAINS DE METAL FRITTE. LE FILTRE SE CARACTERISE PAR DES GRAINS DE METAL FRITTE DE DIMENSIONS RELATIVEMENT GRANDES ET UNE ZONE DE SOUS-SURFACE RELATIVEMENT MINCE ADJACENTE A LA SURFACE EN AMONT CONTENANT DES GRAINS DE METAL FRITTE DE DIMENSIONS RELATIVEMENT PETITES, FORMANT DONC UNE MINCE ZONE DE PORES DE PETITE DIMENSION ADJACENTE A LA SURFACE EN AMONT ALORS QUE LE RESTANT DE LA PARTIE PRINCIPALE DU FILTRE POSSEDE UNE DIMENSION DE PORES RELATIVEMENT GRANDE. LE FILTRE EST PARTICULIEREMENT UTILE COMME FILTRE PAR INERTIE ET COMME SUPPORT DE MEMBRANE D'OSMOSE INVERSE.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/749,874 US4088576A (en) | 1976-12-13 | 1976-12-13 | Method of manufacture of tubular inertial filter |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2424756A1 true FR2424756A1 (fr) | 1979-11-30 |
FR2424756B1 FR2424756B1 (fr) | 1985-02-01 |
Family
ID=25015581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7813147A Granted FR2424756A1 (fr) | 1976-12-13 | 1978-05-03 | Filtre de metal poreux |
Country Status (5)
Country | Link |
---|---|
US (1) | US4088576A (fr) |
JP (1) | JPS54146076A (fr) |
DE (1) | DE2820057C2 (fr) |
FR (1) | FR2424756A1 (fr) |
GB (1) | GB1593127A (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988006477A1 (fr) * | 1987-02-26 | 1988-09-07 | Tech-Sep | Membrane de filtration inorganique modifiee pour la separation de proteines |
WO1991012879A1 (fr) * | 1990-02-21 | 1991-09-05 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Membranes inorganiques et procede de leur fabrication |
Families Citing this family (53)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4329157A (en) * | 1978-05-16 | 1982-05-11 | Monsanto Company | Inorganic anisotropic hollow fibers |
US4190538A (en) * | 1978-09-22 | 1980-02-26 | E. I. Du Pont De Nemours And Company | Pump seal flush |
US4264452A (en) * | 1978-09-22 | 1981-04-28 | E. I. Du Pont De Nemours And Company | Pump seal flush |
US4251453A (en) * | 1979-08-22 | 1981-02-17 | Conoco, Inc. | Production of aluminum alkyls |
US4632764A (en) * | 1979-11-30 | 1986-12-30 | International Sludge Reduction Company | Sludge dewatering process using multiple layer plate |
US4481114A (en) * | 1980-10-30 | 1984-11-06 | International Sludge Reduction Company | Sludge dewatering system |
US4381998A (en) * | 1981-08-27 | 1983-05-03 | U.S. Environmental Products, Inc. | Rigid filter plate and process for manufacture of the same |
US4452698A (en) * | 1981-08-27 | 1984-06-05 | U.S. Environmental Products, Inc. | Rigid filter plate and process for manufacture of the same |
FR2513536B1 (fr) * | 1981-09-30 | 1988-05-06 | Comp Generale Electricite | Dispositif de filtration d'un liquide |
GB8322275D0 (en) * | 1983-08-18 | 1983-09-21 | British Petroleum Co Plc | Removing liquids from slurries |
US4966696A (en) * | 1984-03-01 | 1990-10-30 | Isco, Inc. | Method of making a frit |
ES8705774A1 (es) * | 1984-04-07 | 1987-05-16 | Herding Entstaubung | Filtro para separar particulas de materia solida de medios gaseosos o liquidos |
DE3413214C2 (de) * | 1984-04-07 | 1996-03-21 | Herding Entstaubung | Selbsttragendes Filterelement mit einer porösen Struktur aus körnigem Polyethylen |
DE3413213A1 (de) * | 1984-04-07 | 1985-10-24 | Herding GmbH Entstaubungsanlagen, 8450 Amberg | Filterelement zum abscheiden von feststoffteilchen aus gasfoermigen oder fluessigen medien |
DE3519620A1 (de) * | 1984-06-04 | 1986-01-02 | Norton Co., Worcester, Mass. | Einrichtung und verfahren zur steuerung der diffusion von fluidkomponenten |
US4562039A (en) * | 1984-06-27 | 1985-12-31 | Pall Corporation | Porous metal article and method of making |
US4874516A (en) * | 1984-12-29 | 1989-10-17 | Ngk Insulators, Ltd. | A ceramic filter for semi-ultrafiltration |
ZA86448B (en) * | 1985-02-01 | 1986-11-26 | Pall Corp | Seamless porous metal article and method of making |
DE3681663D1 (de) * | 1985-03-06 | 1991-10-31 | Memtec Ltd | Aenderung der porengroessenverteilung. |
JPS61238315A (ja) * | 1985-04-12 | 1986-10-23 | Ngk Insulators Ltd | 複層フイルタの製造方法 |
GB8524972D0 (en) * | 1985-10-10 | 1985-11-13 | Atomic Energy Authority Uk | Liquid treatment |
US4861580A (en) * | 1985-10-15 | 1989-08-29 | The Liposome Company, Inc. | Composition using salt form of organic acid derivative of alpha-tocopheral |
US5041278A (en) * | 1985-10-15 | 1991-08-20 | The Liposome Company, Inc. | Alpha tocopherol-based vesicles |
EP0242209B1 (fr) * | 1986-04-16 | 1990-06-27 | Alcan International Limited | Membranes composites |
DE3783910D1 (de) * | 1986-05-05 | 1993-03-11 | Virginia Holdings Ltd | Verfahren zur osmotischen destillation und semipermeable sperren dazu. |
DE3727277A1 (de) * | 1986-08-20 | 1988-02-25 | Toshiba Ceramics Co | Verfahren und vorrichtung zum filtern einer fluessigkeit |
GB8700709D0 (en) * | 1987-01-13 | 1987-02-18 | British Hydromechanics | Composite membrane material design |
JPS63237780A (ja) * | 1987-03-27 | 1988-10-04 | Takeshi Kobayashi | 枯草菌のろ過方法 |
EP0414663A4 (en) * | 1987-04-16 | 1991-07-17 | The Liposome Company, Inc. | Liposome continuous size reduction method and apparatus |
FR2614214B1 (fr) * | 1987-04-23 | 1993-02-12 | Commissariat Energie Atomique | Membrane semi-permeable organominerale et son procede de fabrication. |
CA1312033C (fr) * | 1987-09-16 | 1992-12-29 | Clarence M. Eidt, Jr. | Procede combine de cokefaction et d'hydroconversion |
US4834864A (en) * | 1987-09-16 | 1989-05-30 | Exxon Research And Engineering Company | Once-through coking with solids recycle |
JPH01148318A (ja) * | 1987-12-04 | 1989-06-09 | Toshiba Ceramics Co Ltd | 固液分離装置 |
US4888114A (en) * | 1989-02-10 | 1989-12-19 | E. I. Du Pont De Nemours And Company | Sintered coating for porous metallic filter surfaces |
JPH0763571B2 (ja) * | 1990-05-18 | 1995-07-12 | 麒麟麦酒株式会社 | 濾過システム |
US5308494A (en) * | 1993-03-24 | 1994-05-03 | E. I. Du Pont De Nemours And Company | Method for improving filter efficiency |
US5525235A (en) * | 1994-05-17 | 1996-06-11 | Energy Biosystems Corporation | Method for separating a petroleum containing emulsion |
JPH0996622A (ja) * | 1995-09-29 | 1997-04-08 | Matsushita Electric Ind Co Ltd | ガスセンサおよびその製造方法 |
DE19608104C1 (de) * | 1996-03-02 | 1997-10-23 | Hydac Filtertechnik Gmbh | Druckimpuls-Rückspülung von Filtern |
FR2748472B1 (fr) * | 1996-05-09 | 1998-06-26 | Inst Francais Du Petrole | Procede de fabrication d'un materiau poreux inhomogene |
US5897915A (en) * | 1996-10-28 | 1999-04-27 | Corning Incorporated | Coated substrates, method for producing same, and use therefor |
DE19645451C1 (de) * | 1996-11-04 | 1998-08-13 | Tech Uni Dresden Dezernat 5 Sg | Verfahren zur Abtrennung und Verminderung feiner Partikelfraktionen von Suspensionen und Aerosolen |
US6432308B1 (en) | 2000-09-25 | 2002-08-13 | Graver Technologies, Inc. | Filter element with porous nickel-based alloy substrate and metal oxide membrane |
FR2846255B1 (fr) * | 2002-10-25 | 2005-01-28 | Tech Avancees & Membranes Ind | Membrane pour filtration tangentielle et son procede de fabrication |
FR2869241B1 (fr) * | 2004-04-23 | 2006-07-21 | Tech Avancees & Membranes Ind | Support a porosite modifiee et membrane pour la filtration tangentielle d'un fluide |
DE102007012928B4 (de) * | 2007-03-19 | 2009-09-03 | Umicore Ag & Co. Kg | Verfahren zur Einbringung einer katalytischen Beschichtung in die Poren eines keramischen Durchfluß-Wabenkörpers |
DE102008012935B4 (de) * | 2008-03-06 | 2022-04-28 | Piller Entgrattechnik Gmbh | Vorrichtung zum Reinigen von verschmutzten Flüssigkeiten mit einem Rückspülfilter |
DE102012220181A1 (de) | 2012-11-06 | 2014-05-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Partikelfilter |
TWM491518U (zh) * | 2014-06-23 | 2014-12-11 | li-qun He | 柔水滲透出水器 |
DE102015001167A1 (de) * | 2015-02-02 | 2016-08-04 | Entex Rust & Mitschke Gmbh | Entgasen bei der Extrusion von Kunststoffen |
CN108099064A (zh) * | 2017-11-27 | 2018-06-01 | 山东豪迈机械科技股份有限公司 | 基于3d打印的模具制造方法及轮胎模具 |
CN108032466A (zh) * | 2017-11-27 | 2018-05-15 | 山东豪迈机械科技股份有限公司 | 一种轮胎模具及其制造方法 |
CN114769597A (zh) * | 2022-06-24 | 2022-07-22 | 西部宝德科技股份有限公司 | 金属粉末多孔基体管外壁膜层的制备方法及装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1197982A (fr) * | 1958-01-27 | 1959-12-03 | Commissariat Energie Atomique | Membranes poreuses à porosité très fine et leur procédé de fabrication |
DE1115220B (de) * | 1953-06-26 | 1961-10-19 | Purolator Products Inc | Verfahren zur Verbesserung der Filterungseigenschaften eines Spaltfilters |
FR1321462A (fr) * | 1962-02-05 | 1963-03-22 | Poudres Metalliques Alliages Speciaux Ugine Carbone | Procédé de fabrication d'éléments poreux composites |
US3241681A (en) * | 1959-02-09 | 1966-03-22 | Pall Corp | Filter elements |
US3728061A (en) * | 1971-01-29 | 1973-04-17 | Mott Metallurg Corp | Multi-layer spinnerette with head filter |
FR2327090A1 (fr) * | 1971-02-16 | 1977-05-06 | Commissariat Energie Atomique | Procede de fabrication d'elements tubulaires poreux |
DE2622814A1 (de) * | 1976-05-21 | 1977-12-01 | Seitz Filter Werke | Membranfilter mit faserstoff-verstaerkung und verfahren zu seiner herstellung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2457051A (en) * | 1944-08-18 | 1948-12-21 | Tecalemit Ltd | Method of making reinforced porous metal members |
DE1131896B (de) * | 1956-04-18 | 1962-06-20 | Deutsche Edelstahlwerke Ag | Verfahren zum Herstellen poroes gesinterter zweischichtiger Metallkoerper |
US2979400A (en) * | 1959-02-04 | 1961-04-11 | Purolator Products Inc | Porous media |
US3567437A (en) * | 1968-05-16 | 1971-03-02 | Lambert H Mott | Method for forming porous seamless tubing |
US3796314A (en) * | 1972-04-17 | 1974-03-12 | Westinghouse Electric Corp | Castings for reverse osmosis membrane supports |
-
1976
- 1976-12-13 US US05/749,874 patent/US4088576A/en not_active Expired - Lifetime
-
1978
- 1978-05-03 FR FR7813147A patent/FR2424756A1/fr active Granted
- 1978-05-04 JP JP5368578A patent/JPS54146076A/ja active Granted
- 1978-05-08 DE DE2820057A patent/DE2820057C2/de not_active Expired
- 1978-05-08 GB GB18285/78A patent/GB1593127A/en not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1115220B (de) * | 1953-06-26 | 1961-10-19 | Purolator Products Inc | Verfahren zur Verbesserung der Filterungseigenschaften eines Spaltfilters |
FR1197982A (fr) * | 1958-01-27 | 1959-12-03 | Commissariat Energie Atomique | Membranes poreuses à porosité très fine et leur procédé de fabrication |
US3241681A (en) * | 1959-02-09 | 1966-03-22 | Pall Corp | Filter elements |
FR1321462A (fr) * | 1962-02-05 | 1963-03-22 | Poudres Metalliques Alliages Speciaux Ugine Carbone | Procédé de fabrication d'éléments poreux composites |
US3728061A (en) * | 1971-01-29 | 1973-04-17 | Mott Metallurg Corp | Multi-layer spinnerette with head filter |
FR2327090A1 (fr) * | 1971-02-16 | 1977-05-06 | Commissariat Energie Atomique | Procede de fabrication d'elements tubulaires poreux |
DE2622814A1 (de) * | 1976-05-21 | 1977-12-01 | Seitz Filter Werke | Membranfilter mit faserstoff-verstaerkung und verfahren zu seiner herstellung |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988006477A1 (fr) * | 1987-02-26 | 1988-09-07 | Tech-Sep | Membrane de filtration inorganique modifiee pour la separation de proteines |
US4992178A (en) * | 1987-02-26 | 1991-02-12 | Tech-Sep | Inorganic ultrafiltration of microfiltration membrane modified by a hydrophilic polymer, its preparation process and its use for the separation of proteins |
WO1991012879A1 (fr) * | 1990-02-21 | 1991-09-05 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Membranes inorganiques et procede de leur fabrication |
Also Published As
Publication number | Publication date |
---|---|
US4088576A (en) | 1978-05-09 |
FR2424756B1 (fr) | 1985-02-01 |
JPS54146076A (en) | 1979-11-14 |
JPS6120327B2 (fr) | 1986-05-21 |
DE2820057C2 (de) | 1987-04-02 |
DE2820057A1 (de) | 1979-11-22 |
GB1593127A (en) | 1981-07-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |