US2553046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products of naphthoquinone imines and process of making same
Assignee: Sandoz AG
•
Filing: 1947-04-22
•
Granted: 1951-05-15
•
Expires: 1967-04-22
Abstract
No abstract record available.
Inventors
- 👤 Kartaschoff Valentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:09
CPC Classifications
C; C09; C09B; C09B13/00; C09B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A CONDENSATION PRODUCT OF THE NAPTHOQUINONE IMINE SERIES WHICH CORRESPONDS TO THE FORMULA:
Claim 2
Dependent Claim
13 words
A CONDENSATION PRODUCT OF THE NAPTHOQUINONE IMINE SERIES WHICH CORRESPONDS TO THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |