US3924643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilated filter tip cigarette
Assignee: Brown and Williamson Holdings Inc
•
Filing: 1973-12-07
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Granted: 1975-12-09
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Expires: 1993-12-07
Abstract
Abstract An improved ventilated filter cigarette utilizes uniformly porous plug wrap and tipping envelope to provide at least one uniformly porous ventilated region having a predetermined area about the filter. The area and porosity of the region or regions are correlated so as to provide a relationship which, when the limits thereof are observed, provides cigarettes with a more constant, reduced delivery of total particulate matter and gas phase constituents than heretofore obtained by ventilated filter tip cigarettes.
Inventors
- 👤 Thomas Wade Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:36
CPC Classifications
A; A24; A24D; A24D1/00; A24D1/02; A24D1/027
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A ventilated filter tip cigarette comprising: a. a tobacco column; b. a filter enclosed by a porous, air permeable wrapper, characterized by substantially uniform porosity; c. an envelope characterized by substantially uniform porosity enclosing at least a portion of said enclosed filter, said envelope and wrapper being adhered together along at least one preselected region, but not over the entire area of their contiguous surfaces, the remainder of said contiguous surfaces being adhesive free, said envelope being air permeable to permit ambient air flow through a sufficient area of the remainder of said envelope and wrapper so that said area provides a ventilation index of from about 0.5 to 20 cm/sec.
Claim 2
Dependent Claim
111 words
A ventilated filter tip cigarette comprising: a. a tobacco column; b. a filter enclosed by a porous, air permeable wrapper, characterized by substantially uniform porosity; c. an envelope characterized by substantially uniform porosity enclosing at least a portion of said enclosed filter, said envelope and wrapper being adhered together along at least one preselected region, but not over the entire area of their contiguous surfaces, the remainder of said contiguous surfaces being adhesive free, said envelope being air permeable to permit ambient air flow through a sufficient area of the remainder of said envelope and wrapper so that said area provides a ventilation index of from about 0.5 to 20 cm/sec.
Claim 3
Dependent Claim
33 words
The filter tip cigarette of claim 1 in which the area of said envelope and wrapper which is air permeable to permit ambient air flow therethrough is from about 0.5 to 5.0 cm2.
Claim 4
Dependent Claim
18 words
The filter tip cigarette of claim 1 wherein the ventilation index is from about 2.0 to 6.0 cm/sec.
Claim 5
Dependent Claim
90 words
A ventilated filter tip cigarette comprising: a. a tobacco column; b. a filter enclosed by a porous, air permeable wrapper characterized by substantially uniform porosity; c. a porous envelope characterized by substantially uniform porosity enclosing at least a portion of said enclosed filter, at least one surface of said envelope and wrapper being provided with an impervious coating along at least one preselected region, but not over the entire area of said surface, to provide a portion of said area that is air permeable to permit ambient air flow therethrough.
Claim 6
Dependent Claim
90 words
A ventilated filter tip cigarette comprising: a. a tobacco column; b. a filter enclosed by a porous, air permeable wrapper characterized by substantially uniform porosity; c. a porous envelope characterized by substantially uniform porosity enclosing at least a portion of said enclosed filter, at least one surface of said envelope and wrapper being provided with an impervious coating along at least one preselected region, but not over the entire area of said surface, to provide a portion of said area that is air permeable to permit ambient air flow therethrough.
Claim 7
Dependent Claim
40 words
The ventilated filter tip cigarette of claim 4 in which a sufficient area of the air permeable area permits the flow of ambient air therethrough so that said area provides a ventilation index of from about 0.5 to 20 cm/sec.
Claim 8
Dependent Claim
19 words
The ventilated filter tip cigarette of claim 5 wherein the ventilation index is from about 2.0 to 6.0 cm/sec.
Claim 9
Dependent Claim
22 words
The ventilated filter tip cigarette of claim 4 wherein the total area of said remainder is from about 0.5 to 5.0 cm2.
Claim 10
Dependent Claim
108 words
An improved ventilated filter tip cigarette comprising: a. a tobacco column: b. a filter enclosed by a porous, air permeable wrapper characterized by substantially uniform porosity; and c. porous, air permeable tipping paper characterized by substantially uniform porosity enclosing at least a portion of the enclosed filter, at least one surface of said tipping paper or said wrapper being provided with a substantially impervious coating so as to form at least one region which is coating-free to permit ambient air flow therethrough, wherein the area of the at least one saiD region is about 0.5 to 5.0 cm2 and the ventilation index is about 0.5 to 20 cm/sec.
Claim 11
Dependent Claim
108 words
An improved ventilated filter tip cigarette comprising: a. a tobacco column: b. a filter enclosed by a porous, air permeable wrapper characterized by substantially uniform porosity; and c. porous, air permeable tipping paper characterized by substantially uniform porosity enclosing at least a portion of the enclosed filter, at least one surface of said tipping paper or said wrapper being provided with a substantially impervious coating so as to form at least one region which is coating-free to permit ambient air flow therethrough, wherein the area of the at least one saiD region is about 0.5 to 5.0 cm2 and the ventilation index is about 0.5 to 20 cm/sec.
Claim 12
Dependent Claim
25 words
The filter tip cigarette of claim 8 wherein the combined porosity of said wrapper and said tipping paper is from about 1 to 10 cc/sec.
Claim 13
Dependent Claim
91 words
A ventilated filter tip cigarette comprising: a. a tobacco column b. a filter enclosed by a porous, air permeable wrapper, characterized by substantially uniform porosity; c. a porous envelope characterized by substantially uniform porosity enclosing at least a portion of said enclosed filter, said envelope and wrapper being adhered together along at least one preselected region, but not over the entire area of their contiguous surfaces, the remainder of said contiguous surfaces being adhesive free, at least a portion of the remainder being air permeable to permit ambient air flow therethrough.
Claim 14
Dependent Claim
91 words
A ventilated filter tip cigarette comprising: a. a tobacco column b. a filter enclosed by a porous, air permeable wrapper, characterized by substantially uniform porosity; c. a porous envelope characterized by substantially uniform porosity enclosing at least a portion of said enclosed filter, said envelope and wrapper being adhered together along at least one preselected region, but not over the entire area of their contiguous surfaces, the remainder of said contiguous surfaces being adhesive free, at least a portion of the remainder being air permeable to permit ambient air flow therethrough.
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |