Patent US2649385A successfully refreshed from Google Patents.
US2649385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically bleached fibrous material
Assignee: —
•
Filing: —
•
Granted: 1953-08-18
•
Expires: 1970-08-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
D; D01; D01F; D01F2/00; C; C08; C08B; C08B5/00; D06; D06P; D06P1/00; D06P1/13; D21; D21H; D21H11/00; D21H11/16; D21H11/20; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
FIBROUS MATERIALS COMPRISING FIBRES OF ORGANIC DERIVATIVES OF CELLULOSE HAVING ADSORBED THERETO A COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
18 words
FIBROUS MATERIALS COMPRISING FIBRES OF ORGANIC DERIVATIVES OF CELLULOSE HAVING ADSORBED THERETO A COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2528323A
Cited
US2072908A
Cited
US2108485A
Cited
GB522672A
Cited
US2334348A
Cited
GB566810A
Cited
US2468431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |