Patent US3757649A successfully refreshed from Google Patents.
US3757649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke filters
Assignee: Molins Machine Co Ltd
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Filing: 1971-10-13
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Granted: 1973-09-11
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Expires: 1991-10-13
Abstract
Abstract A filter for a cigarette or other smoker''s article wherein loose material is held in separate layers by porous elements arranged between the layers and so arranged that smoke passing from one end of the filter to the other is constrained to pass across and through said layers in succession.
Inventors
- 👤 F Labbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
Apparatus for making cigarette filters, comprising means for forming a continuous tubular filter element; means for feeding a continuous wrapper web towards the tubular filter element; means for securing spacer strips at regular intervals across the wrapper web as it approaches the tubular filter element; means for wrapping the wrapper web around the filter element, whereby the spacer strips space the wrapper web from the tubular filter element to form an annular space between the filter element and the surrounding wrapper; and means for cutting the continuous wrapped tubular filter element at regular intervals into sections each comprising at least one filter element unit surrounded by a section of wrapper web spaced from the filter element unit to define therewith an annular space, one end of which is closed by at least a part of one of the spacer strips; and including means for closing the bore of the tubular filter element unit at the end remote from the end of the annular space closed by the spacer strip.
Claim 2
Dependent Claim
169 words
Apparatus for making cigarette filters, comprising means for forming a continuous tubular filter element; means for feeding a continuous wrapper web towards the tubular filter element; means for securing spacer strips at regular intervals across the wrapper web as it approaches the tubular filter element; means for wrapping the wrapper web around the filter element, whereby the spacer strips space the wrapper web from the tubular filter element to form an annular space between the filter element and the surrounding wrapper; and means for cutting the continuous wrapped tubular filter element at regular intervals into sections each comprising at least one filter element unit surrounded by a section of wrapper web spaced from the filter element unit to define therewith an annular space, one end of which is closed by at least a part of one of the spacer strips; and including means for closing the bore of the tubular filter element unit at the end remote from the end of the annular space closed by the spacer strip.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1, including means for forming depressions in the continuous wrapper web as it approaches the tubular filter element, whereby the depressions space the wrapper web from the tubular filter element at regions remote from the spacer strips.
Claim 4
Dependent Claim
41 words
Apparatus according to claim 1 in which the means for forming a continuous tubular filter element comprise means for bending into tubular formation a laminate comprising at least one layer of particulate filter material sandwiched between webs of porous sheet material.
Claim 5
Dependent Claim
164 words
Apparatus for manufacturing a continuous filter rod comprising the following features in combination: a. means to secure discrete seal elements to a continuous porous web at spaced intervals along its length; b. means to deposit finely divided filter material on to the continuous porous web; c. means to cut the porous web longitudinally into a plurality of strips; d. means to stack the said plurality of strips one on top of the other; e. means to fold the stacked strips into the plurality oF concentric tubes to form a cylinder, the concentric tubes being spaced radially from one another by some of the seal elements and the central bore of the cylinder being closed at intervals along its length by others of the seal elements; and f. means for forming a continuous outer wrapper around the cylinder so that the outer wrapper is spaced on the cylinder by the said some seal elements to provide an annular space between the cylinder and the wrapper.
Claim 6
Dependent Claim
164 words
Apparatus for manufacturing a continuous filter rod comprising the following features in combination: a. means to secure discrete seal elements to a continuous porous web at spaced intervals along its length; b. means to deposit finely divided filter material on to the continuous porous web; c. means to cut the porous web longitudinally into a plurality of strips; d. means to stack the said plurality of strips one on top of the other; e. means to fold the stacked strips into the plurality oF concentric tubes to form a cylinder, the concentric tubes being spaced radially from one another by some of the seal elements and the central bore of the cylinder being closed at intervals along its length by others of the seal elements; and f. means for forming a continuous outer wrapper around the cylinder so that the outer wrapper is spaced on the cylinder by the said some seal elements to provide an annular space between the cylinder and the wrapper.
Claim 7
Dependent Claim
38 words
Apparatus as claimed in claim 4 in which means are provided for forming indentations in the said wrapper web, the indentations serving to locate the cylinder laterally in those positions where there is no seal to do this.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |