US4189511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Celanese Corp
•
Filing: 1977-01-07
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Granted: 1980-02-19
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Expires: 1997-01-07
Abstract
Abstract Improved tobacco smoke filters, particularly cigarette filters, are prepared from a web of synthetic polymeric fibers having applied to at least one surface thereof a film-forming derivative of cellulose. Continuous processes and apparatus for the production of the web and filter are also described.
Inventors
- 👤 William E. Levers
- 👤 Charles H. Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:06
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0204; A24D3/0212; A24D3/022; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/24595; Y10T428/24603; Y10T428/24612
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
An intermediate product adapted for use in the manufacture of improved cigarette filters comprising a web of polyolefin filaments and a dried flexing fracturable film of cellulose acetate, said film coating one surface of said web; said web being comprised of a random stereo reticulated array of filaments produced by causing successive portions of the filaments of said web to be looped about and laid down over preceding filament portions, substantially all of said web having a total denier of about 25,000 to about 120,000 and a surface area of from about 0.1 to about 2.0 square meters per gram, said intermediate product having a pattern configuration impressed into at least one surface thereof.
Claim 2
Dependent Claim
114 words
An intermediate product adapted for use in the manufacture of improved cigarette filters comprising a web of polyolefin filaments and a dried flexing fracturable film of cellulose acetate, said film coating one surface of said web; said web being comprised of a random stereo reticulated array of filaments produced by causing successive portions of the filaments of said web to be looped about and laid down over preceding filament portions, substantially all of said web having a total denier of about 25,000 to about 120,000 and a surface area of from about 0.1 to about 2.0 square meters per gram, said intermediate product having a pattern configuration impressed into at least one surface thereof.
Claim 3
Dependent Claim
29 words
The intermediate product of claim 1 wherein said cellulose acetate is present in an amount of about 10 to 40 percent, based on the weight of the intermediate product.
Claim 4
Dependent Claim
24 words
The intermediate product of claim 1 wherein said pattern configuration comprises grooves defining a path substantially parallel to the longitudinal axis of said web.
References Cited (Backward Citations)
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Cited
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Cited
US3282771A
Cited
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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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |