US2780228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filters for tobacco smoke comprising cellulose esters and ethers
Assignee: Eastman Kodak Co
•
Filing: 1954-03-03
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Granted: 1957-02-05
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Expires: 1974-03-03
Abstract
No abstract record available.
Inventors
- 👤 George P Touey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:58
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; A24D3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A TOBACCO SMOKE FILTER COMPRISING A STRUCTURALLY UNITARY, ELONGATED, ROD-LIKE MASS OF COEXTENSIVE, CRIMPED FIBERS OF AN ESTER OF CELLULOSE AND A POLYBASIC ACID, THE FIBERS OF THE MASS BEING IN SUBSTANTIAL PARALLELISM WITH THE LONGITUDINAL AXIS THEREOF, SAID ESTER HAVING AT LEAST ONE FREE, REACTIVE ACID GROUP PER TEN ANHYDRGLUCOSE UNITS OF THE CELLULOSE.
Claim 2
Dependent Claim
55 words
A TOBACCO SMOKE FILTER COMPRISING A STRUCTURALLY UNITARY, ELONGATED, ROD-LIKE MASS OF COEXTENSIVE, CRIMPED FIBERS OF AN ESTER OF CELLULOSE AND A POLYBASIC ACID, THE FIBERS OF THE MASS BEING IN SUBSTANTIAL PARALLELISM WITH THE LONGITUDINAL AXIS THEREOF, SAID ESTER HAVING AT LEAST ONE FREE, REACTIVE ACID GROUP PER TEN ANHYDRGLUCOSE UNITS OF THE CELLULOSE.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |