US2745830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
c cxnh
Assignee: —
•
Filing: —
•
Granted: 1956-05-15
•
Expires: 1973-05-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:54
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
15 words
AN ALKALI METAL SALT OF A DERIVATIVE OF 4:4''DIAMINOSTILBENE-DISULFONIC ACID-(2:2) WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
15 words
AN ALKALI METAL SALT OF A DERIVATIVE OF 4:4''DIAMINOSTILBENE-DISULFONIC ACID-(2:2) WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
US2376743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |