US2686102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cellulose
Assignee: Acordis UK Ltd
•
Filing: 1950-03-01
•
Granted: 1954-08-10
•
Expires: 1970-03-01
Abstract
No abstract record available.
Inventors
- 👤 Hawkes John Arthur
- 👤 Billing Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:35
CPC Classifications
D; D01; D01C; D01C1/00; D01C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN THE PURIFICATION OF COTTON LINTERS BY A PROCESS WHICH INCLUDES BOILING THE LINTERS UNDER PRESSURE IN A 2-5% CAUSTIC ALKALI SOLUTION AND BLEACHING THE LINTERS, THE IMPROVEMENT WHICH CONSISTS IN GIVING THE LINTERS A SUBSEQUENT ADDITIONAL TREATMENT WITH A CAUSTIC SODA SOLUTION OF CONCENTRATION 15-20% AT A TEMPERATURE VARYING FROM 32-50* C. WITH A 15% SOLUTION TO 45-65* C. WITH A 20% SOLUTION.
Claim 2
Dependent Claim
64 words
IN THE PURIFICATION OF COTTON LINTERS BY A PROCESS WHICH INCLUDES BOILING THE LINTERS UNDER PRESSURE IN A 2-5% CAUSTIC ALKALI SOLUTION AND BLEACHING THE LINTERS, THE IMPROVEMENT WHICH CONSISTS IN GIVING THE LINTERS A SUBSEQUENT ADDITIONAL TREATMENT WITH A CAUSTIC SODA SOLUTION OF CONCENTRATION 15-20% AT A TEMPERATURE VARYING FROM 32-50* C. WITH A 15% SOLUTION TO 45-65* C. WITH A 20% SOLUTION.
References Cited (Backward Citations)
GB263938A
Cited
GB269012A
Cited
GB405884A
Cited
US2087263A
Cited
US2317767A
Cited
US2380706A
Cited
US2408849A
Cited
US2546749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |