Patent US2544087A successfully refreshed from Google Patents.
US2544087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyazo dyestuffs
Assignee: Novartis AG
•
Filing: 1948-09-07
•
Granted: 1951-03-06
•
Expires: 1968-09-07
Abstract
No abstract record available.
Inventors
- 👤 Hindermann Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:58
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
A POLYAZO DYESTUFF CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |