CA1102196A - Method of manufacturing colostomy or ileostomy appliance - Google Patents
Method of manufacturing colostomy or ileostomy applianceInfo
- Publication number
- CA1102196A CA1102196A CA282,041A CA282041A CA1102196A CA 1102196 A CA1102196 A CA 1102196A CA 282041 A CA282041 A CA 282041A CA 1102196 A CA1102196 A CA 1102196A
- Authority
- CA
- Canada
- Prior art keywords
- filter
- layer
- layers
- carbon cloth
- gas permeable
- 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.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
- A61F5/44—Devices worn by the patient for reception of urine, faeces, catamenial or other discharge; Portable urination aids; Colostomy devices
- A61F5/441—Devices worn by the patient for reception of urine, faeces, catamenial or other discharge; Portable urination aids; Colostomy devices having venting or deodorant means, e.g. filters ; having antiseptic means, e.g. bacterial barriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
Abstract
ABSTRACT OF THE DISCLOSURE
A filter is provided for a colostomy or ileostomy bag. The filter has a first layer of material which is gas permeable and water impermeable and forms the gas inlet side of the filter, a second layer of material which is gas permeable or is rendered gas permeable by the presence of at least one aperture therethrough, and a layer of carbon cloth sandwiched between the first and second layers. The first and second layers are secured to the carbon cloth by a weld which extends through the periphery of the carbon cloth. The first and second layers may be of a spun-bonded material.
A filter is provided for a colostomy or ileostomy bag. The filter has a first layer of material which is gas permeable and water impermeable and forms the gas inlet side of the filter, a second layer of material which is gas permeable or is rendered gas permeable by the presence of at least one aperture therethrough, and a layer of carbon cloth sandwiched between the first and second layers. The first and second layers are secured to the carbon cloth by a weld which extends through the periphery of the carbon cloth. The first and second layers may be of a spun-bonded material.
Description
i --~
3~:~96 ~ his invention relates to a -filter for use in venting a colos-tomy or ileostomy bag, and a me-tllod of making such a filter.
When co:lostomy and ileostomy bags are uscd tllere is often a build up of flatus and it is desirable to include some means for releasing this. IIowever, i-f a vent is provided it should also include a means for removing the unpleasant odours from the flatus. A
number of ways of achieving this have bee~ proposed in the past, including the use ol a Lilter containing carbon particles or granules on a suppor-t. A disadvantage of this type of fil-ter is -that a long pathway is nee(led through the carbon for the filter to be effective.
According to the present invention there is provided a filter for a colostomy or ileostomy bag, which comprises a first layer of material which is gas permeable and water impermeable and forms the gas inlet side of the filter, a second layer of material which is gas permeable or is rendered gas permeable by thepresence of at least one aperture therethrough, and a layer of carbon cloth sandwiched be-tween the said first and second layers, the said -first and second layers being secured -to the carbon clo-th by a weld which extends -through the periphery of the carbon cloth.
According to the present invention there is also provided a method of making a filter for use in venting a colostomy or ileostomy bag, wherein an assembly 1 ~ n z~
comprising a ~irst sheet of a gas permeable and wa-ter impermeable material, a second sheet of material which is gas permea'ble or is rendered gas permeable by the provision of at least one aperture therethrough, and a shee-t of car'bon aloth 'between the :Eirst and second shee-ts is Eed to a sealing station where the assembly of sheets is sealed together by a weld extending through the periphery of the car'bon cloth to form a filter comprising two pieces of the said -first and second sheets wi-th a piece of the said carbon clo-th sealed therebetween, and the filter is removed from the remainder of the said assembly.
In the accompanying drawings:
Fig. 1 is an exploded perspective view of one embodiment o-f a filter according to the invention in position OIl a colos-tomy or ileostomy bag;
Fig 2 is a similar view o:~ a second embodiment of filter; and Fig. 3 is a diagra~natic view of an apparatus for carrying out a method according to the invention of making the filter shown in Fig. 20 The filter shown in Fig. 1 comprises on the gas inlet side thereol' a film 1 of material which is gas permeable 'but wa-ter impermea'ble, such as a form of "Tyvek", which, in use, -fits directly over a vent 2 in a I'ace of the 'bag 3 (part o~ which is shown). The name "Tyvek" denotes a range of spun-bonded plastics materials, some of which - -~T~Je ~ k 1 m .. . .
Z~L9~
are impermeable to water and some ot which are not, A carbon cloth 4 wllich is placed on the "Tyvek" layer 1 covered by another film 5 also of "Tyvek" ~ ich is gas permeable and may or may no-t be ~ater imperllleable.
Alternatively the film 5 may be O:r gas impermeable material in which case it is provided with at least one aperture therethrough, An ou-ter layer 7 is u~ed to secure the filter to the outside O:e the bag 3.
The means Eor securing -the fil-ter to -the bag may either be a layer 8 of adhesive (as illustrated), or it may be a weld if the outer layer is made of a suitable material such as polyvinylchloride or poly-vinyldichloride, IE -the outer layer is so arranged that is covers allthe carbon filter i-t i9 necessary to provi~le a suitable area of it, with perEorations 9, unless the outer layer is of a gas permeable material, In the la-tter case the iilm of which the outer layer is made is at least as permeable and preferably even more gas permeable than the film which fi-ts directly over the vent. Alternatively, the outer layer may just be a meansofsecuring the ou-ter edge of -the filter to the bag, for example an adhesive annular ring.
The layers lt~ and 5 are secured together by an annular weld ~hich passes through -the layer 4 a-nd extends to the periphery thereof, The fact that the weld extends to the peripllery of the layer of carbon lm ~ ~ -~ - -9~
cloth 4 means that once the weld is ormed the risk of carbon cloth fraying from the edges thereoL is much reduced. A method of achieving a comparable result with the embodiment of Fig. 2 is describe~l below with reference to Fig. 3 ancl this is appl:ica'ble with appropriate modiications to Ihe embodiment of Fig. 1.
The filter shown in Fig. 2 comprises a layer of carbon cloth 14 sandwiche~'between two layers 11 and 15 of "Tyvek". Between the layer 11 and the bag 3 is a film of polyethylene 17 having a layer 18 of adhesive thereon.
The layers 11,14,15 and 17 are secured together by concentric annular welds 19 and 19l. Although the welds are indicated by lines they would in prac-tice have a finite width, and the weld 19' extends to theperiphery of the layers 11,14,15 and 17.
Fig. 3 shows a method of mal~ing the fil-ter illustrated in Fig~ 2. A double sided silicone release paper 20 having the layer 18 of double sided adhesive transl'er tape thereon is unwound Irom a roll 21 thereof~ The polyethylene film 17 is -unwound from a roll 22 thereof. The film 17 and layer 18 are brought together and travel -toge-ther beneath a reciprocatable punch 23 which punches circular holes in the sheet. The sheets 11 and 15 o "Tyvek" are fed from respec-tive rolls 2l~ and 25 ana the sheet 14 of carbon cloth is fed between the sheets 11 and 15 rom a roll 26.
The assembly of layers 11,14,15,17 and 18 pass together with a protective layer of release paper 29 beneath a ~ . . .
3~:~96 ~ his invention relates to a -filter for use in venting a colos-tomy or ileostomy bag, and a me-tllod of making such a filter.
When co:lostomy and ileostomy bags are uscd tllere is often a build up of flatus and it is desirable to include some means for releasing this. IIowever, i-f a vent is provided it should also include a means for removing the unpleasant odours from the flatus. A
number of ways of achieving this have bee~ proposed in the past, including the use ol a Lilter containing carbon particles or granules on a suppor-t. A disadvantage of this type of fil-ter is -that a long pathway is nee(led through the carbon for the filter to be effective.
According to the present invention there is provided a filter for a colostomy or ileostomy bag, which comprises a first layer of material which is gas permeable and water impermeable and forms the gas inlet side of the filter, a second layer of material which is gas permeable or is rendered gas permeable by thepresence of at least one aperture therethrough, and a layer of carbon cloth sandwiched be-tween the said first and second layers, the said -first and second layers being secured -to the carbon clo-th by a weld which extends -through the periphery of the carbon cloth.
According to the present invention there is also provided a method of making a filter for use in venting a colostomy or ileostomy bag, wherein an assembly 1 ~ n z~
comprising a ~irst sheet of a gas permeable and wa-ter impermeable material, a second sheet of material which is gas permea'ble or is rendered gas permeable by the provision of at least one aperture therethrough, and a shee-t of car'bon aloth 'between the :Eirst and second shee-ts is Eed to a sealing station where the assembly of sheets is sealed together by a weld extending through the periphery of the car'bon cloth to form a filter comprising two pieces of the said -first and second sheets wi-th a piece of the said carbon clo-th sealed therebetween, and the filter is removed from the remainder of the said assembly.
In the accompanying drawings:
Fig. 1 is an exploded perspective view of one embodiment o-f a filter according to the invention in position OIl a colos-tomy or ileostomy bag;
Fig 2 is a similar view o:~ a second embodiment of filter; and Fig. 3 is a diagra~natic view of an apparatus for carrying out a method according to the invention of making the filter shown in Fig. 20 The filter shown in Fig. 1 comprises on the gas inlet side thereol' a film 1 of material which is gas permeable 'but wa-ter impermea'ble, such as a form of "Tyvek", which, in use, -fits directly over a vent 2 in a I'ace of the 'bag 3 (part o~ which is shown). The name "Tyvek" denotes a range of spun-bonded plastics materials, some of which - -~T~Je ~ k 1 m .. . .
Z~L9~
are impermeable to water and some ot which are not, A carbon cloth 4 wllich is placed on the "Tyvek" layer 1 covered by another film 5 also of "Tyvek" ~ ich is gas permeable and may or may no-t be ~ater imperllleable.
Alternatively the film 5 may be O:r gas impermeable material in which case it is provided with at least one aperture therethrough, An ou-ter layer 7 is u~ed to secure the filter to the outside O:e the bag 3.
The means Eor securing -the fil-ter to -the bag may either be a layer 8 of adhesive (as illustrated), or it may be a weld if the outer layer is made of a suitable material such as polyvinylchloride or poly-vinyldichloride, IE -the outer layer is so arranged that is covers allthe carbon filter i-t i9 necessary to provi~le a suitable area of it, with perEorations 9, unless the outer layer is of a gas permeable material, In the la-tter case the iilm of which the outer layer is made is at least as permeable and preferably even more gas permeable than the film which fi-ts directly over the vent. Alternatively, the outer layer may just be a meansofsecuring the ou-ter edge of -the filter to the bag, for example an adhesive annular ring.
The layers lt~ and 5 are secured together by an annular weld ~hich passes through -the layer 4 a-nd extends to the periphery thereof, The fact that the weld extends to the peripllery of the layer of carbon lm ~ ~ -~ - -9~
cloth 4 means that once the weld is ormed the risk of carbon cloth fraying from the edges thereoL is much reduced. A method of achieving a comparable result with the embodiment of Fig. 2 is describe~l below with reference to Fig. 3 ancl this is appl:ica'ble with appropriate modiications to Ihe embodiment of Fig. 1.
The filter shown in Fig. 2 comprises a layer of carbon cloth 14 sandwiche~'between two layers 11 and 15 of "Tyvek". Between the layer 11 and the bag 3 is a film of polyethylene 17 having a layer 18 of adhesive thereon.
The layers 11,14,15 and 17 are secured together by concentric annular welds 19 and 19l. Although the welds are indicated by lines they would in prac-tice have a finite width, and the weld 19' extends to theperiphery of the layers 11,14,15 and 17.
Fig. 3 shows a method of mal~ing the fil-ter illustrated in Fig~ 2. A double sided silicone release paper 20 having the layer 18 of double sided adhesive transl'er tape thereon is unwound Irom a roll 21 thereof~ The polyethylene film 17 is -unwound from a roll 22 thereof. The film 17 and layer 18 are brought together and travel -toge-ther beneath a reciprocatable punch 23 which punches circular holes in the sheet. The sheets 11 and 15 o "Tyvek" are fed from respec-tive rolls 2l~ and 25 ana the sheet 14 of carbon cloth is fed between the sheets 11 and 15 rom a roll 26.
The assembly of layers 11,14,15,17 and 18 pass together with a protective layer of release paper 29 beneath a ~ . . .
2~9~
reciprocatable heat sealing die 27 which -forms annular seals in -the assembly. 8ince the carbon cloth is porous, "Tyveki' l'rom the adjacent sheets 11 and 15 passes in-to the carbon cloth ~uring sealing so that an a~mular seal is forlllecl~hich e~tends compk~tely througll t~le carbon cloth. The fllters thus Eormed are punched ollt of the assembly by a punch 28. The layer 29 forllls no part ol' the filter and goes to waste after the die 28. The layer 29 serves simply to prevent the weld head of the die 27 sticking to the filter during manufacture. Means (not shown) are provided for so adapting t~le reciprocation speed of -the punch 23 and dies 27 and 28 to the speed of travel of the layers 11,1~,15,17 and 18 tha-t the se~ s produced 'by the die 2~ each surround a respec-tive one of the holes produced 'by the punch 23, and the punch 28 accurately punches oùt the Eilter formed. Before use the layer of release paper 20 is removed from the filter to enable it to be adhered to a bag, as sho~n in Fig. 2. The method of Fig. 3 avoids handling small and inconvenien-t separate pieces of carlJon cloth ancl reduces the risl~ cffraying oE the carbon cloth during and a:E-ter manufacture and consequent generation of carbon cloth dust.
In a modificatioll of the method sho~n in Fig. 3 the rolls 21 and 22 are replaced by a single roll oE
polyethylene film having thereon an adhesive layer covered by a release ~per.
~T~d~
lm - 6 ~
2~9~
Preferably, the filter is secured -to the ou-tside of the bag, although it would alternatively be possible to secure it -to the inside of the bag. In either case the ~ater impermeable layer is on the gas inlet side of 5- the filter, that is to say iI the f:ilter is on the outside O:r the bag the water impermeable layer is acljacent the bag, whils-t if the filter is on the inside of the bag the ~rater impermeable layer is remote from the bag.
This means that liquid from the bag cannot enter the carbon cloth.
The vent to which the filter is secured can be on either of the faces of the bag, but it is preferably on the same face as the stoma hole and preferably located above the stoma hole.
If desired, the filter may comprise a plurality of layers of carbon cloth, the filter having alternate layers of carbon cloth and material which is gas permeable or rendered gas permeable by the presence of apertures therethrough.
.20 An example of a suitable carbon cloth is disclosed in U.K. Patent ~pecification No. 1,301,101. I-t is to be understood that the term "carbon cloth" as used herein refers to an activated carbon cloth which may be woven or non-woven.
lm _ 7 -
reciprocatable heat sealing die 27 which -forms annular seals in -the assembly. 8ince the carbon cloth is porous, "Tyveki' l'rom the adjacent sheets 11 and 15 passes in-to the carbon cloth ~uring sealing so that an a~mular seal is forlllecl~hich e~tends compk~tely througll t~le carbon cloth. The fllters thus Eormed are punched ollt of the assembly by a punch 28. The layer 29 forllls no part ol' the filter and goes to waste after the die 28. The layer 29 serves simply to prevent the weld head of the die 27 sticking to the filter during manufacture. Means (not shown) are provided for so adapting t~le reciprocation speed of -the punch 23 and dies 27 and 28 to the speed of travel of the layers 11,1~,15,17 and 18 tha-t the se~ s produced 'by the die 2~ each surround a respec-tive one of the holes produced 'by the punch 23, and the punch 28 accurately punches oùt the Eilter formed. Before use the layer of release paper 20 is removed from the filter to enable it to be adhered to a bag, as sho~n in Fig. 2. The method of Fig. 3 avoids handling small and inconvenien-t separate pieces of carlJon cloth ancl reduces the risl~ cffraying oE the carbon cloth during and a:E-ter manufacture and consequent generation of carbon cloth dust.
In a modificatioll of the method sho~n in Fig. 3 the rolls 21 and 22 are replaced by a single roll oE
polyethylene film having thereon an adhesive layer covered by a release ~per.
~T~d~
lm - 6 ~
2~9~
Preferably, the filter is secured -to the ou-tside of the bag, although it would alternatively be possible to secure it -to the inside of the bag. In either case the ~ater impermeable layer is on the gas inlet side of 5- the filter, that is to say iI the f:ilter is on the outside O:r the bag the water impermeable layer is acljacent the bag, whils-t if the filter is on the inside of the bag the ~rater impermeable layer is remote from the bag.
This means that liquid from the bag cannot enter the carbon cloth.
The vent to which the filter is secured can be on either of the faces of the bag, but it is preferably on the same face as the stoma hole and preferably located above the stoma hole.
If desired, the filter may comprise a plurality of layers of carbon cloth, the filter having alternate layers of carbon cloth and material which is gas permeable or rendered gas permeable by the presence of apertures therethrough.
.20 An example of a suitable carbon cloth is disclosed in U.K. Patent ~pecification No. 1,301,101. I-t is to be understood that the term "carbon cloth" as used herein refers to an activated carbon cloth which may be woven or non-woven.
lm _ 7 -
Claims (11)
1. A filter for a colostomy or ileostomy bag, which com-prises a first layer of material which is gas permeable and water impermeable and forms the gas inlet side of the filter, a second layer of material which is gas permeable or is rendered gas permeable by the presence of at least one aperture therethrough, and a layer of carbon cloth sandwiched between the said first and second layers, all of the said layers being of the same size as one another and having aligned edges, and the said layers being secured together by a weld between the first and second layers passing through the carbon cloth and extending to the periphery of the cloth.
2. A filter as claimed in claim 1, wherein the said first and second layers are of a spun-bonded material.
3. A filter as claimed in claim 1, provided with means for securing the filter to the colostomy or ileostomy bag.
4. A filter as claimed in claim 1, further comprising a cover layer of larger area than the said first and second layers, the cover layer having a face which is secured to the said second layer so that its periphery overlaps edges of the said first and second layers.
5. A filter as claimed in claims 3 and 4, wherein the said face has a layer of adhesive thereon.
6. A filter as claimed in claim 3, further comprising an apertured backing layer having one face secured to the said first layer and the opposite face provided with a layer of adhesive.
7. A filter as claimed in claim 1, comprising a plurality of layers of carbon cloth, the filter having alternate layers of carbon cloth and material which is gas permeable or rendered gas permeable by the presence of apertures therethrough.
8. A method of making a filter for use in venting a colostomy or ileostomy bag, including the steps of providing an assembly comprising a first sheet of a gas permeable and water imper-meable material, a second sheet of material which is gas permeable or is rendered gas permeable by the provision of at least least one aperture therethrough, and a sheet of carbon cloth between the first and second sheets, feeding the assembly to a sealing station where the assembly of sheets is sealed together by a weld extending between the first and second sheets through the periphery of the carbon cloth, cutting the assembly to form a filter comprising two pieces of the said first and second sheets with a piece of the said carbon cloth sealed there-between, the sheets and the cloth of the filter being all of the same size and having aligned edges, and removing the filter from the remainder of the said assembly.
9. A method as claimed in claim 8, wherein the seal is a heat seal.
10. A method as claimed in claim 8 or 9, wherein the gas permeable material is a spun-bonded material.
11. A method as claimed in claim 8 or 9, wherein a sheet of release paper and a backing film adhered thereto by a layer of adhesive are passed together through a punching station, where holes are punched therein, the said assembly of the said first and second sheets and the sheet of carbon cloth is fed together with the layers from the punching station to the sealing station, and the said first and second sheets, the layer of carbon cloth and the backing film are sealed together at the sealing station.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB27974/76A GB1596496A (en) | 1976-07-06 | 1976-07-06 | Filter for a colostomy or ileostomy appliance and a method of manufacture therefor |
| GB27976/76 | 1976-07-06 | ||
| GB27974/76 | 1976-07-06 | ||
| GB2797676 | 1976-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1102196A true CA1102196A (en) | 1981-06-02 |
Family
ID=26259104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA282,041A Expired CA1102196A (en) | 1976-07-06 | 1977-07-05 | Method of manufacturing colostomy or ileostomy appliance |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS535894A (en) |
| CA (1) | CA1102196A (en) |
| DE (1) | DE2730286A1 (en) |
| DK (1) | DK302877A (en) |
| FR (1) | FR2357291A1 (en) |
| IT (1) | IT1079883B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4203445A (en) * | 1978-12-11 | 1980-05-20 | Hollister Incorporated | Gas-venting filter assembly for collection device |
| US4274848A (en) * | 1979-09-24 | 1981-06-23 | Hollister Incorporated | Gas-venting filter for collection appliance |
| JPS5712039A (en) * | 1980-06-25 | 1982-01-21 | Toagosei Chem Ind Co Ltd | One-pack type curable composition with excellent storage stability |
| GB2083760B (en) * | 1980-09-09 | 1984-05-10 | Downs Surgical Ltd | Flatus filter |
| SE426139B (en) * | 1982-02-17 | 1982-12-13 | Matts Ingvar Ramstorp | COLLECTION PHASE FOR GASES, LIQUIDS AND / OR FIXED TOPICS |
| DK147275C (en) * | 1982-02-23 | 1984-12-03 | Coloplast As | FILTER FOR OSTOMIPOS |
| NZ214900A (en) * | 1985-02-14 | 1988-02-12 | Craig Med Prod Ltd | Porous plastics gas filter: water repellant surface layer |
| GB2306346A (en) * | 1995-10-27 | 1997-05-07 | Titus Int Plc | Filtering apparatus for use in respirators |
| FR2873286B1 (en) * | 2004-07-21 | 2006-09-22 | Braun Medical Sas | DEGASSING EVENT FILTER AND BODY FLUID COLLECTION POUCH |
| KR101475104B1 (en) | 2008-06-11 | 2014-12-22 | 덴끼 가가꾸 고교 가부시키가이샤 | Curable compositions |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1453716A (en) * | 1965-11-15 | 1966-06-03 | Colostomy or ileostomy bag | |
| US3646936A (en) * | 1969-10-01 | 1972-03-07 | Arthur E Marsan | Drainage pouch and method of making |
| GB1363644A (en) * | 1971-08-18 | 1974-08-14 | Caldwell C E J | Colostomy and like devices |
| US3759260A (en) * | 1971-09-20 | 1973-09-18 | Hollister Inc | Post surgical drainage collection pouch |
| BE795570A (en) * | 1972-02-17 | 1973-06-18 | Beskyttede Virksomheder | COLOSTOMY OR ILEOSTOMY BAG |
| CA1030032A (en) * | 1973-09-27 | 1978-04-25 | Hollister Incorporated | Vent device for astomy appliance |
-
1977
- 1977-07-04 IT IT5010177A patent/IT1079883B/en active
- 1977-07-05 CA CA282,041A patent/CA1102196A/en not_active Expired
- 1977-07-05 DE DE19772730286 patent/DE2730286A1/en not_active Withdrawn
- 1977-07-05 FR FR7720633A patent/FR2357291A1/en active Granted
- 1977-07-05 DK DK302877A patent/DK302877A/en not_active Application Discontinuation
- 1977-07-06 JP JP8087477A patent/JPS535894A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS535894A (en) | 1978-01-19 |
| DE2730286A1 (en) | 1978-01-12 |
| FR2357291A1 (en) | 1978-02-03 |
| IT1079883B (en) | 1985-05-13 |
| FR2357291B1 (en) | 1984-04-20 |
| DK302877A (en) | 1978-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |