US2527426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitro-distyrylbenzene-disulfonic acids and a method of making same
Assignee: Novartis AG
•
Filing: 1949-07-11
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Granted: 1950-10-24
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Expires: 1969-07-11
Abstract
No abstract record available.
Inventors
- 👤 Keller Ernst
- 👤 Zweidler Reinhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:45
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A 4-NITRO-4''-STYRYL-STILBENE-2.2''-DISULFONIC ACID OF THE FORMULA
Claim 2
Dependent Claim
6 words
A 4-NITRO-4''-STYRYL-STILBENE-2.2''-DISULFONIC ACID OF THE FORMULA
References Cited (Backward Citations)
US2195790A
Cited
CH240125A
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 |