Patent US4433696A successfully refreshed from Google Patents.
US4433696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable dilution filter
Assignee: Philip Morris USA Inc
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Filing: 1981-10-02
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Granted: 1984-02-28
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Expires: 2001-10-02
Abstract
Abstract Smoking article (10) has a filter mouthpiece (14) with a first stage filter element (18) and second stage filter element (19). First stage filter element (18) is rigidly attached to tipping paper (22). Second stage filter element (19) is free to move longitudinally in mouthpiece (14) and may be made to move axially by tapping the cigarette, thus, covering some of the ventilation holes (16) and changing the smoke to air ratio and the flavor.
Inventors
- 👤 John M. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:53
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/041
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
In a smoking article the improvements which comprise: a filter mouthpiece attached to one end of said smoking article by air impervious tipping paper; a second stage filter means mounted in said mouthpiece behind the tobacco portion of said smoking article and free to move in an axial direction in said mouthpiece in response to tapping said mouthpiece on a hard surface; a first stage filter means rigidly mounted in said mouthpiece behind said second stage filter means such that there is space for axial movement of said second stage filter; and ventilation holes in said air impervious tipping paper forward of said first stage filter and behind the tobacco portion of said smoking article.
Claim 2
Dependent Claim
115 words
In a smoking article the improvements which comprise: a filter mouthpiece attached to one end of said smoking article by air impervious tipping paper; a second stage filter means mounted in said mouthpiece behind the tobacco portion of said smoking article and free to move in an axial direction in said mouthpiece in response to tapping said mouthpiece on a hard surface; a first stage filter means rigidly mounted in said mouthpiece behind said second stage filter means such that there is space for axial movement of said second stage filter; and ventilation holes in said air impervious tipping paper forward of said first stage filter and behind the tobacco portion of said smoking article.
Claim 3
Dependent Claim
35 words
A smoking article as in claim 1 wherein a third stage filter means is rigidly mounted in said mouthpiece forward of said second stage filter means and behind the tobacco portion of said smoking article.
Claim 4
Dependent Claim
22 words
A smoking article as in claim 1 wherein said ventilation holes are located immediately behind the tobacco portion of said smoking article.
Claim 5
Dependent Claim
20 words
A smoking article as in claim 1 or 2 wherein said filter means are enclosed in a porous plug wrap.
Claim 6
Dependent Claim
17 words
A smoking article as in claim 1 or 2 wherein said filter means are non-wrapped acetate filters.
Claim 7
Dependent Claim
91 words
A filter mouthpiece comprising: an air impervious outer shell; a third stage filter means rigidly mounted near one end of said outer shell; a first stage filter means rigidly mounted near the opposite end of said outer shell; a second stage filter means mounted in said mouthpiece between said first and third stage filter means and free to move axially in said mouthpiece in response to tapping said mouthpiece on a hard surface; and ventilation holes in said air impervious outer shell between said first stage and third stage filter means.
Claim 8
Dependent Claim
91 words
A filter mouthpiece comprising: an air impervious outer shell; a third stage filter means rigidly mounted near one end of said outer shell; a first stage filter means rigidly mounted near the opposite end of said outer shell; a second stage filter means mounted in said mouthpiece between said first and third stage filter means and free to move axially in said mouthpiece in response to tapping said mouthpiece on a hard surface; and ventilation holes in said air impervious outer shell between said first stage and third stage filter means.
Claim 9
Dependent Claim
25 words
A smoking article as in claim 1 or 2 or 6 wherein said ventilation holes are located immediately forward of said first stage filter means.
Claim 10
Dependent Claim
22 words
A smoking article as in claim 2 or 6 wherein said ventilation holes are located immediately behind said third stage filter means.
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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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |