US4700723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco filter and fibrous ion exchange resin
Assignee: Toray Industries Inc
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Filing: 1984-01-20
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Granted: 1987-10-20
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Expires: 2004-01-20
Abstract
Abstract A filter for tobacco smoke containing a fibrous ion exchange resin and a fibrous ion exchange resin wherein at least a part of the fiber is fibrillated or split for use in making the filter is disclosed. The filter efficiently removes substances harmful to the human body, e.g., ionic, polar, carcinogenic, and mutagenic substances, and nicotine and tar from tobacco smoke.
Inventors
- 👤 Seiichi Yoshikawa
- 👤 Toshio Yoshioka
- 👤 Masaharu Shimamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:13
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/12; A24D3/08; A24D3/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
26 words
A filter for tobacco smoke which comprises an ion exchange fiber, wherein an ion-exchangeable component itself forms a fibrous structure, the ion-exchangeable component being substantially water-insoluble.
Claim 2
Dependent Claim
26 words
A filter for tobacco smoke which comprises an ion exchange fiber, wherein an ion-exchangeable component itself forms a fibrous structure, the ion-exchangeable component being substantially water-insoluble.
Claim 3
Dependent Claim
28 words
A filter as claimed in claim 1, wherein the amount of the ion exchange fiber is not less than 0.1 milligram per 1 g of tobacco being smoked.
Claim 4
Dependent Claim
20 words
A filter as claimed in claim 1, wherein the moisture content of the ion exchange fiber is 0.5 to 80%.
Claim 5
Dependent Claim
25 words
A filter as claimed in claim 1, wherein the ion exchange fiber is a fiber consisting of a ion exchangeable polymer and a reinforcing polymer.
Claim 6
Dependent Claim
28 words
A filter as claimed in claim 4, wherein the ion exchange fiber is an "island-in-sea" type fiber comprising an ion exchangeable sea component and a reinforcing island component.
Claim 7
Dependent Claim
23 words
A filter as claimed in claim 1, wherein the ion exchange fiber contains a fiber that is at least partially fibrillated or split.
Claim 8
Dependent Claim
22 words
A filter as claimed in claim 1, wherein the ion exchange fiber contains a cation exchange fiber as at least one component.
Claim 9
Dependent Claim
24 words
A filter as claimed in claim 7, wherein the cation exchange fiber is a fiber having a sulfonic acid group as the exchange group.
Claim 10
Dependent Claim
18 words
A filter as claimed in claim 8, wherein the cation exchange fiber contains a --SO 3 H group.
Claim 11
Dependent Claim
15 words
A filter as claimed in claim 1, which contains activated carbon as a filter component.
Claim 12
Dependent Claim
18 words
A filter as claimed in claim 1, which contains the ion exchange fiber dispersed in other filter components.
Claim 13
Dependent Claim
19 words
A filter as claimed in claim 11, wherein one of the other filter components is fibers of cellulose acetate.
Claim 14
Dependent Claim
24 words
A filter as claimed in claim 1, wherein a layer containing said ion exchange fiber is inserted perpendicularly to the axis of the filter.
Claim 15
Dependent Claim
22 words
A fibrous ion exchange resin of fibrillated or split islands-in-sea construction comprising an ion exchangeable sea component reinforced with an island component.
Claim 16
Dependent Claim
22 words
A fibrous ion exchange resin of fibrillated or split islands-in-sea construction comprising an ion exchangeable sea component reinforced with an island component.
Claim 17
Dependent Claim
26 words
A sheet which contains a fibrous ion exchange resin of fibrillated or split islands-in-sea construction comprising an ion exchangeable sea component reinforced with an island component.
Claim 18
Dependent Claim
26 words
A sheet which contains a fibrous ion exchange resin of fibrillated or split islands-in-sea construction comprising an ion exchangeable sea component reinforced with an island component.
Claim 19
Dependent Claim
11 words
A sheet as claimed in claim 15, which contains a pulp.
Claim 20
Dependent Claim
43 words
A filter for tobacco smoke, comprising a sheet comprising an ion exchange fiber, wherein an ion-exchangeable component itself forms a fibrous structure, the ion-exchangeable component being substantially water-insoluble, wherein said sheet is arranged in a position parallel to the axis of the filter.
Claim 21
Dependent Claim
43 words
A filter for tobacco smoke, comprising a sheet comprising an ion exchange fiber, wherein an ion-exchangeable component itself forms a fibrous structure, the ion-exchangeable component being substantially water-insoluble, wherein said sheet is arranged in a position parallel to the axis of the filter.
Claim 22
Dependent Claim
25 words
A filter claimed as claim 17 having a construction of parallel layers of the ion exchange fiber sheet and a fibrous non-ion exchange layer sheet.
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |