US2818868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene terephthalate tobacco smoke filter
Assignee: EIDP Inc
•
Filing: 1954-08-04
•
Granted: 1958-01-07
•
Expires: 1974-08-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph T Rivers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:18
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A FILTER FOR TOBACCO SMOKE COMPRISING POLYETHYLENE TEREPHTHALATE FILAMENTS HAVING A DENIER PER FILAMENT WITHIN A RANGE OF FROM ABOUT 0.1 TO ABOUT 10, AND A RETAINING TUBE HAVING SAID FILAMENT DISPOSED THEREIN.
Claim 2
Dependent Claim
33 words
A FILTER FOR TOBACCO SMOKE COMPRISING POLYETHYLENE TEREPHTHALATE FILAMENTS HAVING A DENIER PER FILAMENT WITHIN A RANGE OF FROM ABOUT 0.1 TO ABOUT 10, AND A RETAINING TUBE HAVING SAID FILAMENT DISPOSED THEREIN.
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
US2688380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |