Patent DE394065C successfully refreshed from Google Patents.
US3554202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed cellulose tobacco filter rod
Assignee: Celanese Corp
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Filing: 1966-07-01
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Granted: 1971-01-12
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Expires: 1986-07-01
Abstract
Abstract A cylindrical rod particularly suitable as a cigarette filter is described which is comprised predominantly of foamed fibrous cellulose and a water-insoluble polymer having a glass transition temperature of at most 50* C. and a minor amount of wetting agent, the weight ratio of the polymer to the fibrous cellulose being at least about 0.4, said rod being encased by a skin of said polymer.
Inventors
- 👤 Saunders E Jamison
- 👤 Gene H Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:43
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0229; A24D3/0237; A24D3/06; A24D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A tobacco smoke filter according to claim 1 wherein the water-insoluble polymer is vinylacetate homopolymer.
Claim 2
Dependent Claim
14 words
A tobacco smoke filter according to claim 1 wherein the wetting agent is saponin.
References Cited (Backward Citations)
US2386995A
Cited
US2746088A
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US3253967A
Cited
US3338994A
Cited
US3311115A
Cited
US3256372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |