Patent US2647891A successfully refreshed from Google Patents.
US2647891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscose recovery
Assignee: EIDP Inc
•
Filing: 1949-09-26
•
Granted: 1953-08-04
•
Expires: 1969-09-26
Abstract
No abstract record available.
Inventors
- 👤 Warburton Ryland Royster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:04
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01D; D01D4/00; D01D4/04; D01F13/00; D01F13/02; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A PROCESS FOR CONVERTING VISCOSE ENTRAINED IN A FILTER PRESS TO A VISCOSE CAPABLE OF BEING EMPLOYED IN THE PRODUCTION OF SHAPED ARTICLES WHICH COMPRISES FILTERING VISCOSE THROUGH A PRESS CONTAINING ABOUT 30 FILTER CLOTHS; FORCING ANY UNFILTERED VISCOSE THROUGH SAID PRESS BY FORCING ABOUT 834 GAL. OF SOFT WATER AT 12* C. THROUGH THE SAID PRESS; REPEATING SAID WASHING ABOUT 3 TIMES TO OBTAIN THEREBY ABOUT 7076 LBS. OF DILUTE FILTERED VISCOSE SOLUTION; ADDING TO SAID DILUTE SOLUTION ABOUT 974 LBS. OF 24% CAUSTIC AND ABOUT 2339 LBS. OF CELLULOSE XANTHATE TO OBTAIN THEREBY A CONCENTRATED VISCOSE.
References Cited (Backward Citations)
US1032091A
Cited
US1221554A
Cited
US2159676A
Cited
US2492421A
Cited
US2523977A
Cited
GB620919A
Cited
US2513652A
Cited
US2484013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |