Patent US4753250A successfully refreshed from Google Patents.
US4753250A
Expired / Lapsed
US
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Process for producing tobacco filter to adsorb materials harmful to health, especially aldehydes in the smoke of tobacco
Assignee: PECSI DOHANYGYAR A HUNGARIAN Co
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Filing: 1985-10-18
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Granted: 1988-06-28
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Expires: 2005-10-18
Abstract
Abstract A process for producing cigarette filters comprising a compound containing L-ascorbic acid and having the compound added to an adsorptional filter material in a quantity of 5-200% of the amount of said adsorptional filter.
Inventors
- 👤 Istvan Bitter
- 👤 Jozsef Gabor
- 👤 Sandor Hernadi
- 👤 Viktoria Horvath
- 👤 Sandor Irimi
- 👤 Adam Molnar
- 👤 Istvan Rusznak
- 👤 Lajos Trezl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:58
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/166; A24D3/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A process for producing cigarette filters to adsorb substances which represent a health hazard in cigarette smoke, the process including providing a filter element of adsorptional material, adding to said filter element a compound in a manner whereby said compound reacts, within the filter element with substances including aldehydes not adsorbed by said filter element with a reaction speed increasing proportionally with the rise of the temperature and prevents the desorption of aldehydes, thereby decreasing the amount of harmful materials in the cigarette smoke, characterized by (a) said compound containing enediol structural elements comprising L-ascorbic acid, (b) adding said L-ascorbic acid to said adsorptional filter material in a quantity of 5-200% of the amount of said adsorptional filter material to form a homogenized mixture, (c) applying said homogenized mixture to a fibrous filtering material base.
Claim 2
Dependent Claim
135 words
A process for producing cigarette filters to adsorb substances which represent a health hazard in cigarette smoke, the process including providing a filter element of adsorptional material, adding to said filter element a compound in a manner whereby said compound reacts, within the filter element with substances including aldehydes not adsorbed by said filter element with a reaction speed increasing proportionally with the rise of the temperature and prevents the desorption of aldehydes, thereby decreasing the amount of harmful materials in the cigarette smoke, characterized by (a) said compound containing enediol structural elements comprising L-ascorbic acid, (b) adding said L-ascorbic acid to said adsorptional filter material in a quantity of 5-200% of the amount of said adsorptional filter material to form a homogenized mixture, (c) applying said homogenized mixture to a fibrous filtering material base.
Claim 3
Dependent Claim
38 words
The process according to claim 1, further characterized by adding to said filter element 5-30% finely pulverized CuSO 4 .5H 2 O to provide a catalyst to increase the chemosorptional effect of said compound containing enediol structural elements.
Claim 4
Dependent Claim
30 words
The process according to claim 1, characterized by (a) spreading said L-ascorbic acid in pulverized, granular form on said fibrous filtering material in the quantity of 10-100 milligrams per cigarette.
Claim 5
Dependent Claim
35 words
The process according to claim 16, further characterized by (a) impregnating said fibrous filtering material with 5-25% aqueous solution of said L-ascorbic acid to obtain a quantity of 10-100 milligrams of L-ascorbic acid per cigarette.
Claim 6
Dependent Claim
77 words
The process according to claim 1, further characterized by (a) providing said filter element in the form of two fibrous structured filters, (b) arranging said two fibrous structured filters to form a gap therebetween, (c) said compound containing enediol structural elements comprising L-ascorbic acid, (d) providing an homogenized mixture of porous L-ascorbic acid, and (e) applying said homogenized mixture of porous L-ascorbic acid to said gap to provide a quantity of 10-100 milligrams L-ascorbic acid per cigarette.
Claim 7
Dependent Claim
14 words
The process of claim 1, in which (a) said adsorptional filter is activated charcoal.
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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |