Patent US4149549A successfully refreshed from Google Patents.
US4149549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cigarette and filter
Assignee: Montclair Research Corp
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Filing: 1977-12-19
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Granted: 1979-04-17
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Expires: 1997-12-19
Abstract
Abstract A filter for tobacco smoke employs synthetic, inorganic, water-insoluble, anhydrous fibers having a positive zeta potential at the pH of tobacco smoke. To increase the effectiveness of the filter, the tobacco associated with the filter has mixed therewith and deposited thereon particles of a water-insoluble, hydrophobic, moisture-laden, negative charge-imparting substance.
Inventors
- 👤 Harold Grossman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:06
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A filter for tobacco smoke comprising non-toxic, synthetic, inorganic, water-insoluble, anhydrous fibers having a positive zeta potential at the pH of tobacco smoke, the fibers being of a length to enable the interlocking of the fibers, and the fibers being exposed for contact with particulates in the smoke.
Claim 2
Dependent Claim
48 words
A filter for tobacco smoke comprising non-toxic, synthetic, inorganic, water-insoluble, anhydrous fibers having a positive zeta potential at the pH of tobacco smoke, the fibers being of a length to enable the interlocking of the fibers, and the fibers being exposed for contact with particulates in the smoke.
Claim 3
Dependent Claim
29 words
A filter according to claim 1 wherein the fibers are selected from the group consisting of alumina, zirconia, mixtures of alumina and alumina-silica, and mixtures of zirconia and alumina-silica.
Claim 4
Dependent Claim
11 words
A filter according to claim 1 wherein the fibers are hydrophobic.
Claim 5
Dependent Claim
11 words
A filter according to claim 1 wherein the fibers are hydrophilic.
Claim 6
Dependent Claim
11 words
A filter according to claim 1 wherein the fibers are alumina.
Claim 7
Dependent Claim
21 words
A filter according to claim 5 wherein the alumina fibers are hydrophilic and coated with a positive zeta potential enhancing agent.
Claim 8
Dependent Claim
17 words
A filter according to claim 6 wherein the positive zeta potential enhancing agent is Fe(OH) 3 .
Claim 9
Dependent Claim
25 words
A filter according to claim 5 wherein the alumina fibers have a positive zeta potential at the pH of tobacco smoke of approximately 48 millivolts.
Claim 10
Dependent Claim
21 words
A filter according to claim 8 wherein the alumina fibers are hydrophilic and coated with a positive zeta potential enhancing agent.
Claim 11
Dependent Claim
20 words
A filter according to claim 1 wherein the fibers are hydrophilic and coated with a positive zeta potential enhancing agent.
Claim 12
Dependent Claim
25 words
A filter according to claim 1 wherein the fibers have a positive zeta potential at the pH of tobacco smoke of at least 48 millivolts.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |