US2886563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of viscose from viscose waste
Assignee: Lenzing AG
•
Filing: 1957-12-10
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Granted: 1959-05-12
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Expires: 1977-12-10
Abstract
No abstract record available.
Inventors
- 👤 Grohganz Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:01
CPC Classifications
D; D01; D01F; D01F13/00; D01F13/02; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS OF RECOVERING VISCOSE FROM FILTER CLOTHS AND VISCOSE MAKING EQUIPMENT, WHICH COMPRISES PREWASHING THE FILTER CLOTHS WITH A LIQUOR WHICH CONTAINS FREE SODIUM HYDROXIDE AND FRESH, NON-AGED VISCOSE, TO REMOVE A MAJOR PORTION OF THE AGED VISCOSE CONTAINED IN THE FILTER CLOTHS AND OBTAIN CONCENTRATED WASHINGS, RE-WASHING THE PRE-WASHED FILTER CLOTHS WITH PERMUTIT WATER HAVING A PH-VALUE NOT LESS THAN 7 TO REMOVE SUBSTANTIALLY ALL VISCOSE FROM SAID CLOTHS AND OBTAIN DILUTE WASHINGS, REMOVING FOREIGN MATTER FROM SAID CONCENTRATED WASHINGS BY CENTRIFUGAL SEPARATION AND THEN USING SAID CONCENTRATED WASHINGS FOR DISSOLVING CELLULOSE XANTHATE, AND USING SAID DILUTE WASHINGS FOR CLEANING SAID VISCOSE MAKING EQUIPMENT.
Claim 2
Dependent Claim
106 words
A PROCESS OF RECOVERING VISCOSE FROM FILTER CLOTHS AND VISCOSE MAKING EQUIPMENT, WHICH COMPRISES PREWASHING THE FILTER CLOTHS WITH A LIQUOR WHICH CONTAINS FREE SODIUM HYDROXIDE AND FRESH, NON-AGED VISCOSE, TO REMOVE A MAJOR PORTION OF THE AGED VISCOSE CONTAINED IN THE FILTER CLOTHS AND OBTAIN CONCENTRATED WASHINGS, RE-WASHING THE PRE-WASHED FILTER CLOTHS WITH PERMUTIT WATER HAVING A PH-VALUE NOT LESS THAN 7 TO REMOVE SUBSTANTIALLY ALL VISCOSE FROM SAID CLOTHS AND OBTAIN DILUTE WASHINGS, REMOVING FOREIGN MATTER FROM SAID CONCENTRATED WASHINGS BY CENTRIFUGAL SEPARATION AND THEN USING SAID CONCENTRATED WASHINGS FOR DISSOLVING CELLULOSE XANTHATE, AND USING SAID DILUTE WASHINGS FOR CLEANING SAID VISCOSE MAKING EQUIPMENT.
References Cited (Backward Citations)
US2647891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |