US2507754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyazo dyestuffs
Assignee: Novartis AG
•
Filing: 1947-02-10
•
Granted: 1950-05-16
•
Expires: 1967-02-10
Abstract
No abstract record available.
Inventors
- 👤 Bossard Werner
- 👤 Keller Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/50; C09B35/52; C09B35/38; C09B35/44; C09B35/46; C09B35/463; C09B35/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
THE POLYAZO DYESTUFF CAPABLE OF BEING COPPERED AND CORRESPONDING, IN THE FREE STATE, TO THE FORMULA
References Cited (Backward Citations)
FR474331A
Cited
US1901387A
Cited
FR818154A
Cited
US2243020A
Cited
US2277262A
Cited
US2268935A
Cited
GB543100A
Cited
US2417306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |