Patent JPH0444834A successfully refreshed from Google Patents.
Patent US3854384A successfully refreshed from Google Patents.
US3854384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making tobacco smoke filters
Assignee: Brown and Williamson Holdings Inc
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Filing: 1973-11-12
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Granted: 1974-12-17
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Expires: 1993-11-12
Abstract
Abstract A tobacco-smoke filter comprises a filter tube extending eccentrically within an outer tubular wrapper, the spaces within the tube and between it and the wrapper being closed at opposite ends so that smoke entering the filter at one end is constrained to flow radially through the wall of the tube from one of the said spaces into the other. The filter tube may be closed at one end by a disc with channels at its periphery communicating with the space between the filter tube and the wrapper, while the space between the filter tube and the wrapper is closed at the other end by a disc having a central hole communicating with the space within the tube.
Inventors
- 👤 D Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:58
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
A method of producing a radial-flow tobacco-smoke filter, which filter comprises a porous filter tube extending eccentrically and substantially longitudinally within an outer tubular wrapper whereby a crescent-shaped space is defined between said filter tube and said outer wrapper, a first closure element disposed at one end of the filter tube closing the crescent-shaped space between said filter tube and said outer wrapper, said first closure having an opening therein communicating with the interior of the filter tube, and a second closure element disposed at the opposite end of said filter tube sealing the filter tube, said method comprising the steps of: A. depositing at least one first closure element and at least one second closure element, which closure elements have substantially equal exterior diameters, and at least one filter tube having an exterior diameter less than that of said closure elements upon a moving band, so that a filter tube is disposed between first and second closure elements and eccentric to the axes of said closure elements; B. bringing said filter tube and said first and second closure elements into abutting relationship, and C. enrobing said filter tube and said closure elements, with said filter tube eccentric to the axes of said closure elements, in a strip of wrapper material.
Claim 2
Independent Claim
211 words
A method of producing a radial-flow tobacco-smoke filter, which filter comprises a porous filter tube extending eccentrically and substantially longitudinally within an outer tubular wrapper whereby a crescent-shaped space is defined between said filter tube and said outer wrapper, a first closure element disposed at one end of the filter tube closing the crescent-shaped space between said filter tube and said outer wrapper, said first closure having an opening therein communicating with the interior of the filter tube, and a second closure element disposed at the opposite end of said filter tube sealing the filter tube, said method comprising the steps of: A. depositing at least one first closure element and at least one second closure element, which closure elements have substantially equal exterior diameters, and at least one filter tube having an exterior diameter less than that of said closure elements upon a moving band, so that a filter tube is disposed between first and second closure elements and eccentric to the axes of said closure elements; B. bringing said filter tube and said first and second closure elements into abutting relationship, and C. enrobing said filter tube and said closure elements, with said filter tube eccentric to the axes of said closure elements, in a strip of wrapper material.
Claim 3
Dependent Claim
39 words
The method of claim 1, in which the interior surface of said wrapper material is coated with a heat-activatable adhesive, including the step of heating the enrobed filter tube and closure elements to seal them in said wrapper material.
Claim 4
Dependent Claim
42 words
The method of claim 1 in which said tobacco-smoke filter is produced in the form of a continuous rod comprising a plurality of filter tubes and a plurality of first and second closure elements enrobed within a continuous strip of wrapper material.
Claim 5
Dependent Claim
29 words
The method of claim 3 which includes the step of cutting said rod into sections, each of which sections includes two filter tubes having closure elements at both ends.
Claim 6
Independent Claim
138 words
A method of producing a radial-flow tobacco-smoke filter comprising: A. depositing, at spaced intervals, on a moving band, first disk sections; B. depositing two filter tubes having exterior diameters less said first disk sections on said moving band between each, and eccentric to the axes, of said first disk sections with a space interval between the two filter tubes; C. depositing a second disk section having an exterior diameter substantially the same as said first disk sections on said moving band in each said interval between the two filter tubes; D. bringing said filter tubes and said first and second disk sections into abutting relationship; and E. enrobing the abutting filter tubes and first and second disk sections, with said filter tube eccentric to the axes of said first and second disk sections, in a strip of wrapper.
Claim 7
Independent Claim
138 words
A method of producing a radial-flow tobacco-smoke filter comprising: A. depositing, at spaced intervals, on a moving band, first disk sections; B. depositing two filter tubes having exterior diameters less said first disk sections on said moving band between each, and eccentric to the axes, of said first disk sections with a space interval between the two filter tubes; C. depositing a second disk section having an exterior diameter substantially the same as said first disk sections on said moving band in each said interval between the two filter tubes; D. bringing said filter tubes and said first and second disk sections into abutting relationship; and E. enrobing the abutting filter tubes and first and second disk sections, with said filter tube eccentric to the axes of said first and second disk sections, in a strip of wrapper.
Claim 8
Dependent Claim
56 words
The method of claim 5, in which the interior surface of said wrapper material is coated with a heat-activatable adhesive, including the step of heating said enrobed filter tubes and first and second disk sections to secure said filter tubes and said first and second disk sections in abutting relationship and seal them in said wrapper.
Claim 9
Dependent Claim
34 words
The method of claim 5 which includes the step of cutting the enrobed filter tubes and first and second disk sections into units comprising two filter tubes having a disk sectIon at each end.
Claim 10
Dependent Claim
91 words
The method of claim 5 in which each filter tube has a smaller diameter than said disk sections and in which each first disk section is of a substantially smoke-impervious material having an opening therein, said opening being located so that when said disk section is abutted against a filter tube said opening overlaps with the bore of said filter tube but does not overlap with the outside surface of said filter tube, said disk closing the adjacent end of the crescent-shaped space formed between said filter tube and said wrapper.
Claim 11
Dependent Claim
70 words
The method of claim 8 in which each second disk section is of a substantially smoke-impervious material having longitudinal grooves formed by ribs around the periphery of said second disk, said second disk section, when abutted against a filter tube, closing the adjacent end of the bore of said filter tube, said grooves communicating with the adjacent end of the crescent-shaped space formed between said filter tube and said wrapper.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |