EP0204696A1 - Catchment packs - Google Patents
Catchment packsInfo
- Publication number
- EP0204696A1 EP0204696A1 EP85900154A EP85900154A EP0204696A1 EP 0204696 A1 EP0204696 A1 EP 0204696A1 EP 85900154 A EP85900154 A EP 85900154A EP 85900154 A EP85900154 A EP 85900154A EP 0204696 A1 EP0204696 A1 EP 0204696A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pack
- segments
- catchment
- catchment pack
- wire
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 26
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 13
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 229910001020 Au alloy Inorganic materials 0.000 abstract description 4
- 239000003353 gold alloy Substances 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 9
- 230000003197 catalytic effect Effects 0.000 description 6
- 229910052697 platinum Inorganic materials 0.000 description 5
- 239000010948 rhodium Substances 0.000 description 5
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 229910052703 rhodium Inorganic materials 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910001252 Pd alloy Inorganic materials 0.000 description 2
- BBKFSSMUWOMYPI-UHFFFAOYSA-N gold palladium Chemical compound [Pd].[Au] BBKFSSMUWOMYPI-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 229910000629 Rh alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005247 gettering Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/267—Means for preventing deterioration or loss of catalyst or for recovering lost catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J12/00—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor
- B01J12/007—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor in the presence of catalytically active bodies, e.g. porous plates
-
- B01J35/58—
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
Une garniture de captage indiquée pour être utilisée dans un réacteur d'oxydation d'ammoniac présente une forme géométrique prédéterminée et comprend deux ou plusieurs segments de garniture de captage (10) disposés à plat bord à bord, chacun de ces segments de garniture de captage (10) comprenant des segments de toile métallique de support (11, 12) entrelacés avec un ou plusieurs coussinets (13, 14, 15) de fil métallique composé d'un matériau getter, tel qu'un alliage de palladium-or.A pickup packing suitable for use in an ammonia oxidation reactor has a predetermined geometric shape and comprises two or more pickup packing segments (10) arranged flat edge to edge, each such pickup packing segment (10) comprising supporting wire mesh segments (11, 12) interwoven with one or more pads (13, 14, 15) of wire composed of a getter material, such as a palladium-gold alloy.
Description
CATCHMENT PACKS.
This invention relates to a catchment pack containing layers of material such as are typically used as catalyst catchment or getter means in nitric acid production plants. In the industrial production of nitric acid, it is common practice first to prepare nitric oxide by passing a mixture of ammonia and air at elevated temperature through an oxidation catalyst comprising one or more gauzes woven from wire comprising an alloy of platinum and rhodium. In use, platinum and, to a lesser extent, rhodium are themselves converted to their oxides when are volatile at the plant operating temperatures obtaining and are, in consequence, carried away in the nitric oxide stream to be eventually deposited on cooler parts of the plant downstream of the catalyst or lost altogether to atmosphere. In order to reduce these losses of platinum and rhodium to an acceptable leve catchment gauze packs have been developed for insertion in the catalytic reactor immediately downstream of the catalytic gauze or gauzes. Typically, such packs consist of interleaved gauzes woven from, respectively, a getter material and a support material. A suitable and commonly-used getter material is an alloy of palladium and gold, for example 20% gold-palladium, and a suitable support material is an oxidation-resistant stainless steel such gg Megapyr 2 (Registered Trade Mark).
A sectional view of a typical ammonia oxidation reactor is shown in Figure X of the accompanying drawings. In Figure X, the catalytic platinum-rhodium gauzes are shown at 1 supported on a catchment pack 2 of interleaved stainless steel support
and gold/palladium getter gauzes. The entire catalyst/catchment gauze assembly is clamped together with a gasket 3 between reactor flanges 4. Heavy support bars 5 are provided across the area of the reactor. Figure Y of the accompanying drawings shows a detail of an alternative means of assembling and supporting a catchment gauze pack in which the gauzes are slightly smaller in diameter than the reactor, thus allowing a peripheral expansion space 6, and are supported on a coarse gauze 7 fabricated from, for example, "Iconel" (Trade Mark) steel itself supported on the heavy support bars. Additionally, in this arrangement, the uppermost stainless steel gauze is oversize relative to the remaind¬ er of the getter and support gauzes and is folded over peripherally and beneath the said remainder of the gauzes at 8 so that the entire catchment gauze pack may then be handled as a unit. This is particularly desirable because, although the getter material is capable of retaining its gettering activity over a period amounting to twice or more times the useful lifetime of the cataly¬ tic gauzes,(known in the art as a "campaign"), in use the getter material suffers embrittlement leading to failure of the gauze on movement which usually means in practice that it needs to he discarded early, that is, at the end of a campaign when the reactor is dismantled to renew the catalytic gauzes, or earlier if there is some other reason requiring the reactor to be dismantled. Clearly, the ability to handle the catchment pack as a unit which is fairly rigid tends to mitigate this drawback but, particul¬ arly on low- or medium- pressure oxidation plants which may
have a reactor diameter in the region of 3 metres or more, there is an inherent degree of flexibility in the pack which causes embrittled gauzes to fail on handling. Additionally, of course, a catchment gauze pack suitable for such a large diameter reactor is a particularly heavy and bulky item to store in security, to transport and generally to handle.
It is, therefore, an object of the invention to provide a catchment pack which is substantially rigid, is easy to store and transport and may readily be removed from and replaced in a catalytic reactor such as an ammonia oxidation reactor without failure of the getter material.
We have now found that catchment packs may comprise a plurality of pack segments, for example sectors, which may be located in contiguous relationship one with another in a reactor to provide together in effect a catchment pack extending over substantially the entire surface area of the catalytic gauze.
According to one aspect of the invention, we propose a catch¬ ment pack segment suitable for use in an ammonia oxidation reactor and adapted to be located in planar edge-to-edge relationship with one or more further catchment pack segments to form a composite catchment pack having a predetermined geometric shape, the pack segment comprising support gauze segments interleaved with one or more pads of wire formed from a getter material.
According to a second aspect of the invention, we propose a method of making a catchment pack segment, comprising interleaving support gauze segments of a required shape with one or more pads
of wire formed from a getter material and of a required shape, and securing the segments and the or each pad together.
This invention also includes a catchment pack when made from a plurality of segments according to the first or second aspects of the invention, wherein the predetermined shape is preferably regular.
The wire pad may be in the form of knitted wire or randomly oriented wire either of which can be compressed. By knitted wire is meant interlocked loops of wire. If the pad is in the form of knitted wire, this may be formed as a continuous tube, which can be slit longitudinally, and opened out to form a single knitted layer. The weight of metal of a single such knitted layer can be in the range 50 to 1500 g/m2 , preferably 150 to 1300 g/m2. Where the catchment pack is intended for use in a catalyst reactor such as an ammonia oxidation reactor, the catchment pack segment comprises at least two gauze segments made of a support material such as oxidation-resistant stainless steel, for example
Megapyr 2, and interleaved between the or each two adjacent support gauzes, one or more wire pads made of a getter material such as an alloy of palladium and gold, for example 20% gold-palladium, although other getter materials may be used, particularly less robust materials or materials which in use become less robust.
Where more than one pads of getter material are used.-each pad is preferably of different gauge wire and of different voidage.
This is because the upstream portion or portions of the catchment pack absorb relatively more of the platinum and rhodium and therefore need to be more robust; they also tend to swell more
in use. Also, the downstream portion or portions should have
less voidage, subject to avoiding substantial increase in the
back presusre, so as more effectively to getter platinum and
rhodium still remaining in the gas stream after passing through
the upstream portion or portions.
The diameter of the wire should be in the range 0.05mm to
0.4 mm. The preferred range is from 0.06 to 0.25 mm for metal
weight optimised according to the position in the pack.
Production, transportion and storage of catchment pack segments
according to this invention, is easier than the production, trans¬
portation and storage of conventional catchment packs in the
form of pads of wire which extend across the entire area of the
ammonia oxidation reactor, particularly using more than one pad
of wire for which it is necessary to compress the pads evenly
together over a large area and secure them between support gauzes.
Wire pad catchment packs, being relatively inflexible (as opposed
to gauze catchment packs), could not be rolled up to form a tube
for the purposes of transportation and storage and hence the
invention imparts a considerable practical advantage in use.
Where different gauge wire is used in adjacent pads, the
upstream pad is formed from wire typically having a diameter in the range 150-250 microns and the downstream pad is formed from wire typically having a diameter in the range 50-100 microns Intermediate pads may be formed from wire typically having a diameter in the range 100 to 150 microns. The thickness of each pad and of the total catchment pack is dependent upon the operating pressure and other parameters of the particular ammonia oxidation plant.
A pack segment according to the invention may have the form of a sector, for example a semi-circle or a quadrant, or another shape which, when located in planar contiguous relationship with one or more further pack segments (which further segment or segments may or may not have the same or similar shape to the first segment) provides a catchment pack having a predetermined, e.g. regular, geometric shape. It is normally preferred that the regular shape is circular, and other shapes may be used for example rectangular, square or polygonal, for example hexagonal.
This invention also includes methods of making catchment pack segments. For example, a catchment pack segment according to the invention may be made by assembling or superposing segments of the required material and shape in the required order and securing them together to form a pack. Securing may be achieved for example by folding one or more marginal portions of an outermost support gauze over an edge of the assembly (in which case at least one support gauze segment should be oversize relative to the remainder to provide a suitable marginal portion), or by welding, riveting, tying with wire and the like.
Individual pack segments according to the invention may be located in planar contiguous relationship one with another to form a circular or other regular shaped arrangement for location in a catalyst reactor, although we have found that for many purposes it is convenient to hingeably connect the segments in such a way that they can themselves be folded for transportation and storage so that the entire catchment pack assumes the shape and area of the individual segments thereof. Alternatively, individual segments may be temporarily held one with another in the reactor, hingeably or otherwise.
For locating in a catalyst reactor, for example, the folded pack is placed on the the support bars or other support means with the peripheral edge of the folded pack adjacent to the inner edge of the reactor body and the pack is unfolded so that individual catchment pack segments lie in planar contiguous relationship one with another to substantially cover (except for a peripheral expansion gap and small gaps between hinged edges of adjacent pack segments and the like) the dross-rseetional area of the reactor. Embodiments of the invention will be described by way of example with reference to Figures 1 to 3 of the drawings. In these figures: Figure shows a perspective view of a catchment pack segment in the form of a quadrant, partly cut away to show a section through the pack;
Figures 2A to 2E show how four quadrants as shown in Figure 1 may be hingeably connected and folded; and,
Figures 3A to 3 show various ways of assembling catchment pack segments to form catchment packs having a regular geometric shape.
Referring to Figure 1, a catchment pack segment 10 has the form of a quadrant. It consists of outermost support gauzes 11, 12 secured between which are three wire pads 13, 14 and 15 formed from knitted and compressed wire formed from a getter material such as palladium gold alloy. Pad 13 is formed from the heaviest gauge (200 microns) wire and is lightly compressed; pad 14 in turn is formed from lighter gauge (125 microns) wire and is relatively more compressed. Pad 15 is formed from the lightest gauge wire (75 microns) and is compressed the most.
The pads and support gauzes are secured together with staples
16 to provide a pack segment. Pad 13 is the upstream pad when located in the reactor next to the catalyst gauzes. One way of higeably connecting four catchment pack segments such as shown in Figure 1 is shown in Figures 2A to 2E. In Figyre 2A four catchment pack segments SI, S2, S3 and S4 are shown hingeably connected at mutually adjacent edges SI and S2, SI and S4, and S3 and S4 of the segments respectively. Hingeable connection are shown at SS. Figure 2B illustrates the first fold (i.e. segments SI and S2 together folded on segments S3 and S4) and
Figure 2C illustrates the second and third folds (i.e. segments
S3 and S2 are respectively folded back upon segments S4 and SI).
Figure 2D illustrates the resulting folded catchment pack segments, and Figure 2E shows the pack segments unfolded to provide a catch¬ ment pack as located in, for example, a catalylst reactor. Option-
ally, the segments S2 and S3 can be held together, for example by stitc as shown in Figure 2E at SS (the original hingeable connections being omitted for the sake of clarity.
One pack segment according to the invention may be hingeably connected with another by any convenient method, for example by stitchi by use of hoops or by hoops and rods. The material from which hoops or other hingeing means are made should obviously be capable of with¬ standing conditions obtaining in whatever use the catchment pack is to be put and should preferably be reasonably flexible for ease of folding and non-interference with, for example, adjacent catalyst gauze Optionally, hingeable connections may be made or broken, e.g. by inserting or removing a rod from a series of hoops, on site.
Although the invention has been -particulariy- described with reference to a catchment pack segment formed in the shape of a quad- rant it is to be appreciated that the invention provides a pack seg¬ ment comprising a plurality of segments which may be assembled by stacking one or another and securing the resulting stack so that the individual segments are held in fixed relationship one with another. Alternative embodiments of the invention are illustrated in Figure 3 of the accompanying drawings, in which are shown ways in which pack segments may be located in planar contiguous relation¬ ship one with another to provide a catchment pack having a regular geometric shape. Individual pack segments of Figure 3 may optionally be hingeably connected to an adjacent segment. Catchment packs may have diameters of up to several metres and their provision in segments optionally hingeably connected together as above described saves a considerable amount of space
during transportation from a manufacturer to the site, for example a nitric acid plant. Furthermore, in certain cases, transportation costs are calculated on the "girth" of the article and the invention results in a considerable reduction in girth. A catchment pack consisting of segments according to the invention may be readily installed in a plant and may also be readily removed, either by removing individual pack segments or by folding segments if they are hingeably connected and removing the entire pack, without damaging the getter material. The removed pack may easily be handled, stored in security during plant mainten¬ ance and the like, or transported for the purpose of refining and platinum recovery.
Claims
1. A catchment pack segment suitable for use in an ammonia oxidation reactor and adapted to be located in planar edge-to-edge relationship with one or more further catchment pack segments to form a composite catchment pack having a predetermined geometric shape, the pack segment comprising support gauze segments interleaved with one or more pads of wire formed from a getter material.
2. A catchment pack segment according to claim 1, wherein the support gauze segments and the or each wire pad have at least when assembled substantially identical shape and area and are held in fixed, superposed relationship one with another.
3. A catchment pack segment according to claim 2, in which the support material comprises an oxidation-resistant stainless steel.
4. A catchment pack segment according to claim 2, in which the getter material comprises an alloy comprising gold and palladium.
5. A catchment pack segment according to any preceding claim in which the segments and the or each wire pad have the form of a sector of a circle.
6. A catchment pack segment according to claim 5, in which the sector is a semi-circle.
7. A catchment pack segment according to claim 5, in which the sector is a quadrant.
8. A catchment pack segment according to any preceding claim, wherein the wire pad is in the form of knitted or randomly oriented wire.
9. A catchment pack segment according to claim 8, wherein the wire is compressed.
10. A method of making a catchment pack segment, comprising interleaving support gauze segments of a required shape with one or more pads of wire formed from a getter material and of a required shape, and securing the segments and the or each pad together.
11. A method according to claim 10, in which an outermost support gauze segment is oversize relative to the remainder of the segments to provide a marginal portion which is folded over an edge of the superposed assembly to effect securing.
12. A catchment pack having a predetermined geometric shape and comprising two or more catchment pack segments located in planar edge—to-edge relationship one with another each of said catchment pack segments comprising support gauze segments interleaved with one or more pads of wire formed from a getter material.
13. A catchment pack according to claim 12, In which the pack segments and the or each pad have substantially identical shape and area.
14. A catchment pack according to claim 12, in which at least two of the pack segments have a different shape and area from each other.
15. A catchment pack according to claim 12, 13 or 14, in which at least two adjacent segments are hingeably connected.
16. A catchment pack segment constructed and arranged as herein described with reference to and as illustrated in Figure 1 of the drawings.
17. A catchment pack constructed and arranged as herein described with reference to and as Illus rated In any of Figures 2 and 3 of the drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838307086A GB8307086D0 (en) | 1979-05-03 | 1983-03-15 | Laminar articles |
| GB08406363A GB2141042B (en) | 1983-03-15 | 1984-03-12 | Gauze/wire pad pack segments for catalytic reactor |
| PCT/GB1984/000428 WO1986003479A1 (en) | 1983-03-15 | 1984-12-11 | Catchment packs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0204696A1 true EP0204696A1 (en) | 1986-12-17 |
Family
ID=26285515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85900154A Pending EP0204696A1 (en) | 1983-03-15 | 1984-12-11 | Catchment packs |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0204696A1 (en) |
| JP (1) | JPS62501411A (en) |
| BR (1) | BR8407375A (en) |
| GB (1) | GB2141042B (en) |
| WO (1) | WO1986003479A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2141042B (en) * | 1983-03-15 | 1986-12-31 | Johnson Matthey Plc | Gauze/wire pad pack segments for catalytic reactor |
| GB8431364D0 (en) * | 1984-12-12 | 1985-01-23 | Johnson Matthey Plc | Catchment packs |
| EP0364153B1 (en) * | 1988-10-12 | 1992-03-04 | Johnson Matthey Public Limited Company | Metal fabrics |
| NO168689C (en) * | 1989-12-13 | 1992-03-25 | Norsk Hydro As | CATALYSTATOR PACKAGE SUPPORT IN AN AMMONIA BURNER |
| GB2274071A (en) * | 1993-01-06 | 1994-07-13 | Pgp Ind Inc | Catalyst pack |
| GB9302531D0 (en) * | 1993-02-09 | 1993-03-24 | Johnson Matthey Plc | Improvements in pt recovery |
| GB2294419A (en) * | 1994-10-24 | 1996-05-01 | Pgp Ind Inc | Handling foraminous sheets in industrial catalysis |
| US6509334B1 (en) | 1999-05-04 | 2003-01-21 | American Home Products Corporation | Cyclocarbamate derivatives as progesterone receptor modulators |
| NO318861B1 (en) | 2002-07-03 | 2005-05-18 | Yara Int Asa | Catalyst Grid Support Device and Method for Reducing Movement of Particular Ceramic Material Due to Thermal Expansion |
| EP3056267A1 (en) * | 2015-02-12 | 2016-08-17 | Umicore AG & Co. KG | Catalyst gauze and installation for the catalytic oxidation of ammunia |
| CN111659149B (en) * | 2020-06-16 | 2021-10-08 | 上海化工研究院有限公司 | Rectifying tower, rectifying system and application thereof |
| CN113559817B (en) * | 2020-06-16 | 2022-10-14 | 上海化工研究院有限公司 | Corrugated wire mesh sheet for forming structured packing, structured packing and rectifying tower |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2353640C3 (en) * | 1973-10-26 | 1979-01-11 | Uop Inc., Des Plaines, Ill. (V.St.A.) | Catalyst carrier |
| GB1567593A (en) * | 1976-10-20 | 1980-05-21 | Matsushita Electric Ind Co Ltd | Exhaust gas control equipment |
| US4351887A (en) * | 1979-05-03 | 1982-09-28 | Johnson, Matthey & Co., Limited | Foldable metallic gauze pack and segment |
| GB2064975B (en) * | 1979-10-18 | 1984-03-14 | Johnson Matthey Co Ltd | Fibrous catalytic materials |
| JPS5939768B2 (en) * | 1980-10-01 | 1984-09-26 | 富士通株式会社 | input/output system |
| JPS5762438A (en) * | 1980-10-03 | 1982-04-15 | Toshiba Corp | Control system for fifo memory |
| JPS57120144A (en) * | 1981-01-16 | 1982-07-27 | Toshiba Corp | Data transfer system |
| GB2141042B (en) * | 1983-03-15 | 1986-12-31 | Johnson Matthey Plc | Gauze/wire pad pack segments for catalytic reactor |
-
1984
- 1984-03-12 GB GB08406363A patent/GB2141042B/en not_active Expired
- 1984-12-11 BR BR8407375A patent/BR8407375A/en unknown
- 1984-12-11 WO PCT/GB1984/000428 patent/WO1986003479A1/en not_active Application Discontinuation
- 1984-12-11 JP JP60500263A patent/JPS62501411A/en active Pending
- 1984-12-11 EP EP85900154A patent/EP0204696A1/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8603479A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62501411A (en) | 1987-06-11 |
| GB2141042B (en) | 1986-12-31 |
| GB2141042A (en) | 1984-12-12 |
| WO1986003479A1 (en) | 1986-06-19 |
| GB8406363D0 (en) | 1984-04-18 |
| BR8407375A (en) | 1987-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB LI LU NL SE |
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| 17P | Request for examination filed |
Effective date: 19861121 |
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| 17Q | First examination report despatched |
Effective date: 19870629 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HEYWOOD, ALAN, EDWARD Inventor name: BISHOP, DAVID, CYRIL |