US4219030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aeration groove filter
Assignee: Liggett Group LLC
•
Filing: 1978-10-26
•
Granted: 1980-08-26
•
Expires: 1998-10-26
Abstract
Abstract The filter plug of the cigarette is provided with an annular peripheral groove to enable air to pass directly into the fibrous body of the filter material after passing through apertures in the tipping paper. Use is made of ordinary plug wrap paper instead of a high porosity tea bag paper to wrap the fibrous filter material. The groove extends through the layer of plug wrap paper and thus communicates directly with the filter material.
Inventors
- 👤 Floyd V. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:19
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/043; A24D3/02; A24D3/025; A24D3/0258
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A filter plug having a body of entrainment-type fibrous filter material, a layer of plug wrap paper of predetermined thickness circumferentially about said body, and a peripheral annular groove of a depth at least equal to the thickness of said layer of plug wrap paper, said groove extending through said layer of plug wrap paper to communicate the exterior of the filter plug with said body of filter material.
Claim 2
Dependent Claim
69 words
A filter plug having a body of entrainment-type fibrous filter material, a layer of plug wrap paper of predetermined thickness circumferentially about said body, and a peripheral annular groove of a depth at least equal to the thickness of said layer of plug wrap paper, said groove extending through said layer of plug wrap paper to communicate the exterior of the filter plug with said body of filter material.
Claim 3
Dependent Claim
34 words
A filter as set forth in claim 1 wherein said groove is of a depth greater than the thickness of said layer of plug wrap paper and penetrates into said body of filter material.
Claim 4
Dependent Claim
75 words
A filter plug for a high air dilution cigarette having a cylindrical body of entrainment-type fibrous filter material, a layer of plug wrap paper of predetermined thickness circumferentially about said body, and an annular peripheral groove of a depth at least equal to the thickness of said layer of plug wrap paper, said groove extending through said layer of plug wrap and communicating the exterior of the filter directly with said body of filter material.
Claim 5
Dependent Claim
75 words
A filter plug for a high air dilution cigarette having a cylindrical body of entrainment-type fibrous filter material, a layer of plug wrap paper of predetermined thickness circumferentially about said body, and an annular peripheral groove of a depth at least equal to the thickness of said layer of plug wrap paper, said groove extending through said layer of plug wrap and communicating the exterior of the filter directly with said body of filter material.
Claim 6
Dependent Claim
82 words
A filter plug for forming a multiplicity of filters having an elongated body of entrainment-type fibrous filter material, a layer of plug wrap paper of predetermined thickness circumferentially about said body, and at least two spaced apart peripheral grooves, each said groove extending through said layer of plug wrap paper and being of a depth at least equal to the thickness of said layer of plug wrap paper to communicate the exterior of the plug directly with said body of filter material.
Claim 7
Dependent Claim
82 words
A filter plug for forming a multiplicity of filters having an elongated body of entrainment-type fibrous filter material, a layer of plug wrap paper of predetermined thickness circumferentially about said body, and at least two spaced apart peripheral grooves, each said groove extending through said layer of plug wrap paper and being of a depth at least equal to the thickness of said layer of plug wrap paper to communicate the exterior of the plug directly with said body of filter material.
Claim 8
Dependent Claim
111 words
A high air dilution type filter cigarette comprising a tobacco column; a filter plug abutting one end of said tobacco column, said filter plug having a cylindrical body of entrainment-type fibrous filter material, a layer of plug wrap paper circumferentially about said body, and at least one annular peripheral groove extending through said layer of plug wrap paper and communicating the exterior of said filter with said body of filter material; and a layer of tipping paper joining said filter plug and said tobacco column together, said layer of tipping paper having a circumferential array of perforations aligned with said groove in said filter for admitting air into said filter body.
Claim 9
Dependent Claim
111 words
A high air dilution type filter cigarette comprising a tobacco column; a filter plug abutting one end of said tobacco column, said filter plug having a cylindrical body of entrainment-type fibrous filter material, a layer of plug wrap paper circumferentially about said body, and at least one annular peripheral groove extending through said layer of plug wrap paper and communicating the exterior of said filter with said body of filter material; and a layer of tipping paper joining said filter plug and said tobacco column together, said layer of tipping paper having a circumferential array of perforations aligned with said groove in said filter for admitting air into said filter body.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |