Patent US3268084A successfully refreshed from Google Patents.
US3268084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulked non-wovens
Assignee: Celanese Corp
•
Filing: 1963-02-20
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Granted: 1966-08-23
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Expires: 1983-02-20
Abstract
No abstract record available.
Inventors
- 👤 Jr William T Allman
- 👤 Charles W Joseph
- 👤 Jr Ralph G Higgins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:45
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
A FILTER CARTRIDGE COMPRISING A PERFORATED CORE CONTAINING A ROLL OF A BULKY NON-WOVEN SHEET MATERIAL COMPRISING SUBSTANTIALLY CONTINUOUS SUBSTANTIALLY RANDOMLY KDIRECTED CELLULOSE ACETATE FILAMENTS FUSED TO ONE ANOTHER AT SPACED POINTS, SAID FILAMENTS RANGING IN DENIER FROM ABOUT 1 TO 20 AND BEING CRIMPED IN THREE DIMENSIONS BETWEEN FUSION POINTS AS A RESULT OF HAVING BEEN CONTACTED WITH STEAM.
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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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |