US3608564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cigarette filter
Assignee: Mitsubishi Chemical Corp
•
Filing: 1969-05-15
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Granted: 1971-09-28
•
Expires: 1989-05-15
Abstract
Abstract Cigarette filters comprising one graft polymer selected from the group consisting of polyvinyl alcohol grafted with at least one monoethylenically unsaturated vinyl monomer and partially saponified polyvinyl alcohol grafted with at least one monoethylenically unsaturated vinyl monomer. A plug comprising a bundle of opened fibers to fit a cigarette carries said polymer.
Inventors
- 👤 Hiroji Takahashi
- 👤 Atsushi Saito
- 👤 Kazuo Kuwahara
- 👤 Katsumi Hayashi
- 👤 Takashi Kaneko
- 👤 Shigeya Hayashi
- 👤 Kenji Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:47
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
23 words
Cigarette filters of claim 1 wherein said partially saponified polyvinyl alcohol has a saponification value ranging from about 60 to about 92 percent.
Claim 2
Dependent Claim
18 words
Cigarette filters of claim 1 wherein said grafted polymer has a polymerization degree of from 300 to 10,000.
Claim 3
Dependent Claim
35 words
Cigarette filters of claim 1 wherein at least one of said vinyl monomers is a compound selected from the group consisting of lower alkyl esters of acrylic acid and lower alkyl esters of methacrylic acid.
Claim 4
Dependent Claim
29 words
Cigarette filters of claim 4 wherein said lower alkyl ester of acrylic acid is a compound selected from the group consisting of methyl acrylate, ethyl acrylate and butyl acrylate.
Claim 5
Dependent Claim
16 words
Cigarette filters of claim 4 wherein said lower alkyl ester of methacrylic acid is methyl methacrylate.
Claim 6
Dependent Claim
25 words
Cigarette filters of claim 1 wherein the grafting ratio ranges from about 10 to about 310 percent by weight of the polymer to be grafted.
Claim 7
Dependent Claim
26 words
Cigarette filters of claim 1 wherein said grafted polymer is a finely divided powder having a particle size ranging from about 10 to about 300 mesh.
Claim 8
Dependent Claim
26 words
Cigarette filters of claim 8 wherein said grafted polymer is a finely divided powder having a particle size of from about 60 to about 80 mesh.
Claim 9
Dependent Claim
22 words
Cigarette filters of claim 8 wherein said finely divided powder has a surface area of from about 15 to about 200 m.2/g.
Claim 10
Dependent Claim
24 words
Cigarette filters of claim 8 wherein said finely divided powder is porous and has a specific gravity of from about 0.2 to about 1.1.
Claim 11
Dependent Claim
12 words
Cigarette filters of claim 8 wherein said plug is a fiber tow.
Claim 12
Dependent Claim
28 words
Cigarette filters of claim 8 wherein the weight of said finely divided powder ranges from about 5 to about 80 percent based on the weight of said plug.
Claim 13
Dependent Claim
36 words
Cigarette filters of claim 1 wherein said plug comprises a crimped fiber bundle having a monofilament size ranging from about 1.6 to about 15 denier and from about 30,000 to about 90, 000 total filament denier.
Claim 14
Dependent Claim
16 words
Cigarette filters of claim 14 wherein said fibers have crimps of from about 5 to 30/inch.
Claim 15
Dependent Claim
12 words
Cigarette filters of claim 14 wherein said fibers are cellulose diacetate fibers.
Claim 16
Dependent Claim
11 words
Cigarette filters of claim 14 wherein said fibers are polypropylene fibers.
Claim 17
Dependent Claim
11 words
Cigarette filters of claim 14 wherein said fibers are viscose fibers.
Claim 18
Dependent Claim
30 words
Cigarette filters of claim 1 wherein said plug comprises fibers treated with an adhesive consisting of a solution or dispersion containing more than 20 percent by weight of a plasticizer.
Claim 19
Dependent Claim
27 words
Cigarette filters of claim 19 wherein said fibers are sprayed with said adhesive in an amount of from 5 to 18 percent by weight of said fibers.
Claim 20
Dependent Claim
30 words
Cigarette filters of claim 19 wherein said plasticizer is a compound selected from the group consisting of triacetin, etHylene glycol acetate, polyethylene glycol acetate, methyl ethyl ether, and vinyl acetate.
Claim 21
Dependent Claim
17 words
Cigarette filters of claim 14 wherein the monofilament size of the fiber bundle ranges from 1.6-8.0 denier.
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |