US3650279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco-smoke filter and method of making same
Assignee: OTTO WACHS
•
Filing: 1970-02-13
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Granted: 1972-03-21
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Expires: 1990-02-13
Abstract
Abstract A filter for tobacco smoke consisting of clay, kaolin or feldspars or like aluminum silicate minerals which have been rendered substantially electropositive by an initial cleaning step, preferably by electrodialysis or electrolytic treatment, followed by a cationizing step in which the cationic material is adsorbed onto the mineral particles. The particles may also be rendered suitable for the filtration of tobacco smoke by subjecting them to an electrophoresis or electrolysis whereby the electronegativity is reduced.
Inventors
- 👤 Helmut Gansloser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:15
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/166
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
The method defined in claim 1 wherein said electrical treatment is electrodialysis.
Claim 2
Dependent Claim
12 words
The method defined in claim 1 wherein said electrical treatment involves electrolysis.
Claim 3
Dependent Claim
12 words
The method defined in claim 1 wherein said electrical treatment is electrophoresis.
Claim 4
Dependent Claim
26 words
The method defined in claim 1 wherein said particles are incorporated in a filter in part by dispersing said particles throughout a mass of cellulosic fibers.
Claim 5
Independent Claim
108 words
The method of making an adsorber for the tarry constituent of cigarette smoke, comprising the steps of: a. forming a body of mineral silicate particles selected from the group which consists of clay, kaolin and feldspar and having naturally occurring electronegative character; b. at least partly removing the electronegative charge on said particles; b1. initially cleaning said particles in aqueous suspension to reduce the electronegative character of the particles; b2. thereafter adsorbing a cationizing material on said particles to impart electropositive character thereto and c. incorporating said particles in a tobacco-smoke filter, said cationizing substance being selected from the group which consists of methylene blue and ferrous sulfate.
Claim 6
Dependent Claim
26 words
The method defined in claim 6 wherein said particles are incorporated in a filter in part by dispersing said particles throughout a mass of cellulosic fibers.
Claim 7
Dependent Claim
75 words
A tobacco smoke filter comprising a charge of mineral silicate particles selected from the group consisting of clay, kaolin and feldspar having naturally occurring electronegative character, said charge being shaped to conform to the smoke passageway of a smoking article, the said particles having a reduced electronegative charge thereon by being subjected to electrical treatment operative tO remove ions from the said particles, the filter particles being effective to adsorb tarry constituents from the smoke.
References Cited (Backward Citations)
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US2839065A
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |