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Patent US2553049A successfully refreshed from Google Patents.
US2553049A
Expired / Lapsed
US
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Condensation products of the naphthoquinone-imine series
Assignee: Sandoz AG
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Filing: 1950-02-13
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Granted: 1951-05-15
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Expires: 1970-02-13
Abstract
No abstract record available.
Inventors
- 👤 Kartaschoff Valentin
- 👤 Merian Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:26
CPC Classifications
C; C09; C09B; C09B13/00; C09B13/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
10 words
THE CONDENSATION PRODUCT OF THE NAPHTHOQUINONE-IMINE SERIES OF 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 |