US2620283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of fibrous filter media
Assignee: Celanese Corp
•
Filing: 1948-09-04
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Granted: 1952-12-02
•
Expires: 1968-09-04
Abstract
No abstract record available.
Inventors
- 👤 Taylor William Ivan
- 👤 Grebby John William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:25
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/10; D01D1/106; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
PROCESS FOR THE PRODUCTION OF A FILTER MEDIUM SUITABLE FOR FILTERING SPINNING SOLUTIONS OF CELLULOSE ACETATE IN ACETONE, WHICH COMPRISES IMPREGNATNG A FELTED SHEET OF CELLULOSE FIBRES WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE CELLULOSE ETHER, WHICH IS ADHERENT TO SAID CELLULOSE FIBRES, COMPRESSING THE IMPREGNATED FELTED SHEET, AND REMOVING THE WATER FROM THE COMPRESSED SHEET BY EVAPORATION WHILE THE SHEET IS STILL HELD IN THE COMPRESSED STATE.
Claim 2
Dependent Claim
68 words
PROCESS FOR THE PRODUCTION OF A FILTER MEDIUM SUITABLE FOR FILTERING SPINNING SOLUTIONS OF CELLULOSE ACETATE IN ACETONE, WHICH COMPRISES IMPREGNATNG A FELTED SHEET OF CELLULOSE FIBRES WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE CELLULOSE ETHER, WHICH IS ADHERENT TO SAID CELLULOSE FIBRES, COMPRESSING THE IMPREGNATED FELTED SHEET, AND REMOVING THE WATER FROM THE COMPRESSED SHEET BY EVAPORATION WHILE THE SHEET IS STILL HELD IN THE COMPRESSED STATE.
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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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |