US3704192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making tobacco smoke filters from extruded polymer and binder
Assignee: Celanese Corp
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Filing: 1969-02-06
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Granted: 1972-11-28
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Expires: 1989-02-06
Abstract
Abstract CIGARETTE FILTERS ARE PREPARED FROM A RANDOM ARRAY OF CONTINUOUS SPRAY-SPUN SYNTHETIC FILAMENTARY MATERIAL, THE FILAMENTS OF SAID FLAMENTARY MATERIAL VARYING IN DIAMETER WITH THE PERIODICITY CHARACTERISTICS OF THE FILAMENT BEING SUCH THAT THE CHANGE IN DIAMETER OCCURS OVER A RELATIVELY LONG DISTANCE ALONG THE FILAMENT LENGTH.
Inventors
- 👤 John William Soehngen
- 👤 William Sherwood Wagner
- 👤 Saunders Eliot Jamison
- 👤 Dale Kelley Canfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:11
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0229; A24D3/0237
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |