Patent US2852535A successfully refreshed from Google Patents.
US2852535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disulfonic acid amides of the anthraquinone series
Assignee: Sandoz AG
•
Filing: 1957-03-08
•
Granted: 1958-09-16
•
Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Peter Albin
- 👤 Wydler Erhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:27
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A DISULFONIC ACID AMIDE OF THE ANTHRAQUINONE SERIES WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
13 words
A DISULFONIC ACID AMIDE OF THE ANTHRAQUINONE SERIES WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
US2731476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |