US3890983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing cigarette filter
Assignee: Daicel Corp
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Filing: 1973-08-22
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Granted: 1975-06-24
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Expires: 1993-08-22
Abstract
Abstract A method for preparing a cigarette filter of cellulose acetate fibers is provided, which is characterized by blooming a tow composed of cellulose acetate fibers, adding to the bloomed tow 1 to 20% by weight (based on the cellulose acetate fibers) of a plasticizer comprising as an ingredient a diglycerol ester compound and gathering the thus treated bloomed tow.
Inventors
- 👤 Hideo Sawada
- 👤 Junji Kawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:48
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; A24D3/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
A TOBACCO SMOKE FILTER COMPRISING A BUNDLE OF SUBSTANTIALLY LONGITUDINALLY EXTENDING CELLULOSE ACETATE FIBERS HAVING A SIZE OF FROM 1 TO 16 DENIER PER FIBER, SAID FIBERS BEING SUBSTANTIALLY UNIFORMLY COATED WITH FROM 1 TO 20% BY WEIGHT, BASED ON THE WEIGHT OF THE FIBERS, OF A PLASTICIZER COMPRISING AS AN INGREDIENT A COMPOUND OR A MIXTURE OF COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
62 words
A TOBACCO SMOKE FILTER COMPRISING A BUNDLE OF SUBSTANTIALLY LONGITUDINALLY EXTENDING CELLULOSE ACETATE FIBERS HAVING A SIZE OF FROM 1 TO 16 DENIER PER FIBER, SAID FIBERS BEING SUBSTANTIALLY UNIFORMLY COATED WITH FROM 1 TO 20% BY WEIGHT, BASED ON THE WEIGHT OF THE FIBERS, OF A PLASTICIZER COMPRISING AS AN INGREDIENT A COMPOUND OR A MIXTURE OF COMPOUNDS HAVING THE FORMULA:
Claim 3
Dependent Claim
30 words
A tobacco smoke filter according to claim 1, in which the amount of plasticizer is from 5 to 10% by weight, based on the weight of the cellulose acetate fibers.
Claim 4
Independent Claim
56 words
A method for preparing a cigarette filter of cellulose acetate fibers, which comprises blooming a tow composed of cellulose acetate fibers, distributing uniformly throughout the bloomed tow from 1 to 20% by weight, based on the cellulose acetate fibers, of a plasticizer comprising as an ingredient a compound or a mixture of compounds having the formula:
Claim 5
Independent Claim
56 words
A method for preparing a cigarette filter of cellulose acetate fibers, which comprises blooming a tow composed of cellulose acetate fibers, distributing uniformly throughout the bloomed tow from 1 to 20% by weight, based on the cellulose acetate fibers, of a plasticizer comprising as an ingredient a compound or a mixture of compounds having the formula:
Claim 6
Dependent Claim
14 words
A method according to claim 3, wherein said plasticizer consists essentially of said ingredient.
Claim 7
Dependent Claim
18 words
A method according to claim 3, wherein said plasticizer contains at least 50% by weight of said ingredient.
Claim 8
Dependent Claim
32 words
A method according to claim 5, wherein the remainder of said plasticizer is a substance selected from the group consisting of triacetin and the diacetate, dipropionate and dibutyrate esters of polyethylene glycol.
Claim 9
Dependent Claim
23 words
A method according to claim 3, wherein the amount of said plasticizer is from 5 to 10%, based on the cellulose acetate fibers.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |