US3856025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco filters
Assignee: Resonac Holdings Corp
•
Filing: 1973-03-21
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Granted: 1974-12-24
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Expires: 1993-03-21
Abstract
Abstract Tobacco smoke filters mainly consisting of ethylene-vinyl acetate copolymer containing 10 to 80 mol percent of ethylene and saponified to an extent of more than 85 percent.
Inventors
- 👤 W Sato
- 👤 S Yamamoto
- 👤 N Kuwabara
- 👤 S Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
112 words
TOBACCO SMOKE FILTERS ADAPTED FOR USE WITH A TOBACCO SMOKE ARTICLE AND OF A SHAPE TO BE INSERTED IN THE SMOKE PASSAGE OF SUCH TOBACCO SMOKE ARTICLE WHICH COMPRISES A MIXTURE OF 80 TO 20 PARTS BY WEIGHT OF COPOLYMER MATERIAL AND 20 TO 80 PARTS BY WEIGHT OF POLYOLEFIN MATERIAL, SAID COPOLYMER MATERIAL CONSISTING OF ETHYLENE-VINYL ACETATE COPOLYMER CONTAINING 10 TO 80 MOL % OF ETHYLENE, WHICH COPOLYMERS HAS BEEN SAPONIFIED TO AN EXTENT OF AT LEAST 85 PERCENT AND SAID POLYOLEFIN MATERIAL IS SELECTED FROM THE GROUP CONSISTING OF POLYPROPYLENE AND POLYETHYLENE, SAID COPOLYMER MATERIAL AND SAID POLYOLEFIN MATERIAL BEING IN THE FORM OF FIBERS, SPLIT FIBERS, FILMS OR MOLDINGS.
Claim 2
Dependent Claim
112 words
TOBACCO SMOKE FILTERS ADAPTED FOR USE WITH A TOBACCO SMOKE ARTICLE AND OF A SHAPE TO BE INSERTED IN THE SMOKE PASSAGE OF SUCH TOBACCO SMOKE ARTICLE WHICH COMPRISES A MIXTURE OF 80 TO 20 PARTS BY WEIGHT OF COPOLYMER MATERIAL AND 20 TO 80 PARTS BY WEIGHT OF POLYOLEFIN MATERIAL, SAID COPOLYMER MATERIAL CONSISTING OF ETHYLENE-VINYL ACETATE COPOLYMER CONTAINING 10 TO 80 MOL % OF ETHYLENE, WHICH COPOLYMERS HAS BEEN SAPONIFIED TO AN EXTENT OF AT LEAST 85 PERCENT AND SAID POLYOLEFIN MATERIAL IS SELECTED FROM THE GROUP CONSISTING OF POLYPROPYLENE AND POLYETHYLENE, SAID COPOLYMER MATERIAL AND SAID POLYOLEFIN MATERIAL BEING IN THE FORM OF FIBERS, SPLIT FIBERS, FILMS OR MOLDINGS.
Claim 3
Dependent Claim
22 words
Tobacco smoke filters as claimed in claim 1 wherein said copolymer material and said polyolefin material are in the form of fibers.
Claim 4
Dependent Claim
14 words
Tobacco smoke filters as claimed in claim 1 for use with tobacco smoking pipes.
Claim 5
Dependent Claim
15 words
A tobacco smoke filter as claimed in claim 1 for attachment to a single cigarette.
Claim 6
Dependent Claim
14 words
Tobacco smoke filters as claimed in claim 1 for use with a cigarette holder.
Claim 7
Dependent Claim
12 words
Tobacco smoke filters as claimed in claim 1 which are cartridge filters.
Claim 8
Dependent Claim
84 words
A tobacco smoke filter adapted for use with a tobacco smoke article and of a shape to be inserted in the smoke passage of such tobacco smoke article, said filter having a porosity of 50 to 85 percent and comprising as essential filter material ethylene-vinyl acetate copolymer containing 10 to 80 mol percent ethylene and having the vinyl acetate moiety thereof saponified to an extent of at least 85 percent, said filter material being in the form of fibers, split fibers, films or moldings.
Claim 9
Dependent Claim
84 words
A tobacco smoke filter adapted for use with a tobacco smoke article and of a shape to be inserted in the smoke passage of such tobacco smoke article, said filter having a porosity of 50 to 85 percent and comprising as essential filter material ethylene-vinyl acetate copolymer containing 10 to 80 mol percent ethylene and having the vinyl acetate moiety thereof saponified to an extent of at least 85 percent, said filter material being in the form of fibers, split fibers, films or moldings.
Claim 10
Dependent Claim
24 words
A tobacco smoke filter of claim 7 wherein said copolymer contains 20 to 65 mol percent ethylene and is in the form of fibers.
Claim 11
Dependent Claim
16 words
A tobacco smoke filter of claim 8 wherein said saponification extent is at least 90 percent.
Claim 12
Dependent Claim
50 words
A cigarette with attached filter comprising as essential filter material ethylene-vinyl acetate copolymer containing 10 to 80 mol percent ethylene and having the vinyl acetate moiety thereof saponified to an extent of at least 85 percent, said filter material being in the form of fibers, split fibers, films or moldings.
Claim 13
Dependent Claim
50 words
A cigarette with attached filter comprising as essential filter material ethylene-vinyl acetate copolymer containing 10 to 80 mol percent ethylene and having the vinyl acetate moiety thereof saponified to an extent of at least 85 percent, said filter material being in the form of fibers, split fibers, films or moldings.
Claim 14
Independent Claim
66 words
The method of filtering tobacco smoke in a tobacco smoke article which comprises passing the tobacco smoke through a filter which comprises as essential filter material ethylene-vinyl acetate copolymer containing 10 to 80 mol percent ethylene and having the vinyl acetate moiety thereof saponified to an extent of at least 85 percent, said filter material being in the form of fibers, split fibers, films or moldings.
Claim 15
Independent Claim
66 words
The method of filtering tobacco smoke in a tobacco smoke article which comprises passing the tobacco smoke through a filter which comprises as essential filter material ethylene-vinyl acetate copolymer containing 10 to 80 mol percent ethylene and having the vinyl acetate moiety thereof saponified to an extent of at least 85 percent, said filter material being in the form of fibers, split fibers, films or moldings.
Claim 16
Dependent Claim
33 words
The method of claim 11 wherein said filter contains a mixture of 80 to 20 parts by weight of fibers of said copolymer with 20 to 80 parts by weight of polyethylene 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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |