US2527425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stilbene disulfonic acid products
Assignee: Novartis AG
•
Filing: 1948-10-18
•
Granted: 1950-10-24
•
Expires: 1968-10-18
Abstract
No abstract record available.
Inventors
- 👤 Keller Ernst
- 👤 Zweidler Reinhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:46
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C11; C11D; C11D3/00; C11D3/40; C11D3/42; D; D06; D06L; D06L4/00; D06L4/60; C07C; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A BRIGHTENING AGENT COMPRISING A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
9 words
A BRIGHTENING AGENT COMPRISING A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2195790A
Cited
GB584484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |