Patent US4120715A successfully refreshed from Google Patents.
US4120715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a filter for use in venting colostomy or ileostomy appliances
Assignee: Smiths Group PLC
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Filing: 1977-06-30
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Granted: 1978-10-17
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Expires: 1997-06-30
Abstract
Abstract The invention provides a method of making a filter for use in venting a colostomy or ileostomy bag. An assembly comprising a first sheet of a gas permeable and water impermeable material, a second sheet of material which is gas permeable or is rendered gas permeable by the provision of at least one aperture therethrough, and a sheet of carbon cloth between the first and second sheets is fed to a sealing station. In the sealing station the assembly of sheets is sealed together, preferably heat sealed by a weld extending through the periphery of the carbon cloth, to form a filter comprising two pieces of the above mentioned first and second sheets with a piece of the carbon cloth sealed therebetween. The filter is then removed from the remainder of the assembly.
Inventors
- 👤 Malcolm Charles Ockwell
- 👤 Patrick Hugh McLeod
- 👤 Peter James Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
A; A61; A61F; A61F5/00; A61F5/44; A61F5/441; B; B01; B01D; B01D46/00; B01D46/10; B32; B32B; B32B3/00; B32B3/26; B32B3/266; B32B38/00; B32B38/0004; B32B2262/00; B32B2262/10; B32B2262/106; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2307/726; B32B2307/7265; B32B2439/00; B32B2439/40; B32B2439/46; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1084; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T156/1095; Y10T428/00; Y10T428/14; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A method of making a filter for use in venting a colostomy or ileostomy bag, the method comprising forming an assembly comprising a first sheet of a gas-permeable and water-impermeable material, a second sheet of material which is gas-permeable or is rendered gas-permeable by the provision of at least one aperture therethrough, and a sheet of carbon cloth between the first and second sheets; feeding the assembly to a heat sealing station; heat sealing the assembly of sheets together by forming an annular weld extending through the carbon cloth to define a filter comprising the said first and second sheets with a piece of the carbon cloth sealed therebetween; and punching out the welded-together filter from the remainder of the said assembly.
Claim 2
Independent Claim
122 words
A method of making a filter for use in venting a colostomy or ileostomy bag, the method comprising forming an assembly comprising a first sheet of a gas-permeable and water-impermeable material, a second sheet of material which is gas-permeable or is rendered gas-permeable by the provision of at least one aperture therethrough, and a sheet of carbon cloth between the first and second sheets; feeding the assembly to a heat sealing station; heat sealing the assembly of sheets together by forming an annular weld extending through the carbon cloth to define a filter comprising the said first and second sheets with a piece of the carbon cloth sealed therebetween; and punching out the welded-together filter from the remainder of the said assembly.
Claim 3
Independent Claim
167 words
A method of making a filter for use in venting a colostomy or ileostomy bag, the process comprising passing a sheet of release paper and a backing film adhered thereto by a layer of adhesive through a punching station; punching a hole through the release paper and backing film; forming an assembly comprising a first sheet of gas-permeable and water-impermeable, spun-bonded material, a second sheet of gas-permeable, spun-bonded material, a sheet of carbon cloth between the first and second sheets, and the sheet of release paper, and adhered backing film, adjacent the first sheet; passing the assembly to a heat-sealing station; heat sealing the backing film and the first and second sheets together by an annular weld extending through the carbon cloth to define a filter comprising the first and second sheets with the carbon cloth therebetween and the release paper and adhered backing film, the backing film being directly welded to the first sheet; and punching out the welded filter from the remainder of the assembly.
Claim 4
Independent Claim
167 words
A method of making a filter for use in venting a colostomy or ileostomy bag, the process comprising passing a sheet of release paper and a backing film adhered thereto by a layer of adhesive through a punching station; punching a hole through the release paper and backing film; forming an assembly comprising a first sheet of gas-permeable and water-impermeable, spun-bonded material, a second sheet of gas-permeable, spun-bonded material, a sheet of carbon cloth between the first and second sheets, and the sheet of release paper, and adhered backing film, adjacent the first sheet; passing the assembly to a heat-sealing station; heat sealing the backing film and the first and second sheets together by an annular weld extending through the carbon cloth to define a filter comprising the first and second sheets with the carbon cloth therebetween and the release paper and adhered backing film, the backing film being directly welded to the first sheet; and punching out the welded filter from the remainder of the assembly.
Claim 5
Independent Claim
178 words
A method of making a filter for use in venting colostomy or ileostomy bag, the process comprising passing a sheet of release paper and a backing film adhered thereto by a layer of adhesive through a punching station; punching a hole through the release paper and backing film; forming an assembly comprising a first sheet of gas-permeable and water-impermeable, material, a second sheet of material which is gas-permeable, or is rendered gas-permeable by the provision of at least one aperture therethrough, a sheet of carbon cloth between the first and second sheets, and the sheet of release paper and adhered backing film, adjacent the first sheet; passing the assembly to a heat-sealing station; heat sealing the backing film and the first and second sheets together by an annular weld extending through the carbon cloth to define a filter comprising the first and second sheets with the carbon cloth therebetween and the release paper and adhered backing film, the backing film being directly welded to the first sheet; and punching out the welded filter from the remainder of theassembly.
Claim 6
Independent Claim
178 words
A method of making a filter for use in venting colostomy or ileostomy bag, the process comprising passing a sheet of release paper and a backing film adhered thereto by a layer of adhesive through a punching station; punching a hole through the release paper and backing film; forming an assembly comprising a first sheet of gas-permeable and water-impermeable, material, a second sheet of material which is gas-permeable, or is rendered gas-permeable by the provision of at least one aperture therethrough, a sheet of carbon cloth between the first and second sheets, and the sheet of release paper and adhered backing film, adjacent the first sheet; passing the assembly to a heat-sealing station; heat sealing the backing film and the first and second sheets together by an annular weld extending through the carbon cloth to define a filter comprising the first and second sheets with the carbon cloth therebetween and the release paper and adhered backing film, the backing film being directly welded to the first sheet; and punching out the welded filter from the remainder of theassembly.
Claim 7
Dependent Claim
53 words
The method of claim 3 comprising in addition, placing a second sheet of release paper adjacent the second sheet of gas-permeable material and wherein the annular weld is formed by applying a weld head to the assembly, whereby the second release sheet is placed between the weld head and the second gas-permeable sheet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |