US2763650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivatives of x
Assignee: —
•
Filing: —
•
Granted: 1956-09-18
•
Expires: 1973-09-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:42
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
AN OPTICAL BLEACHING AGENT CONSISTING ESSENTIALLY OF AN ALKALI SALT OF A 4:4''-DIAMINOSTILBENE-DISULFONIC ACID(2:2'') OF THE FORMULA
Claim 2
Dependent Claim
17 words
AN OPTICAL BLEACHING AGENT CONSISTING ESSENTIALLY OF AN ALKALI SALT OF A 4:4''-DIAMINOSTILBENE-DISULFONIC ACID(2:2'') OF THE FORMULA
References Cited (Backward Citations)
US564835A
Cited
US2595030A
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US2221361A
Cited
US2171427A
Cited
US2376743A
Cited
US2368844A
Cited
US2473475A
Cited
GB624052A
Cited
US2612501A
Cited
US2539766A
Cited
US2666054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |