US2644000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New quinoxaline derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1951-05-14
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Granted: 1953-06-30
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Expires: 1971-05-14
Abstract
No abstract record available.
Inventors
- 👤 Landquist Justus Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:46
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/36; C07D241/50; C07D241/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
QUINOXALINE-DI-N-OXIDES SELECTED FROM THE GROUP CONSISTING OF 6:7-DIMENTHYL QUINOXALINE1:4 - DI-N-OXIDE, 6-CHLOROQUKNIOXALINE-1:4-DI-NOXIDE, 6-CHLORO-7-METHYL-QUINOXALINE-1:4-DI-NOXIDE, 6-BROMOQUINOXALINE-1:4-DI-N-OXIDE.
Claim 2
Dependent Claim
14 words
QUINOXALINE-DI-N-OXIDES SELECTED FROM THE GROUP CONSISTING OF 6:7-DIMENTHYL QUINOXALINE1:4 - DI-N-OXIDE, 6-CHLOROQUKNIOXALINE-1:4-DI-NOXIDE, 6-CHLORO-7-METHYL-QUINOXALINE-1:4-DI-NOXIDE, 6-BROMOQUINOXALINE-1:4-DI-N-OXIDE.
References Cited (Backward Citations)
US2416658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |