US2579420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing 6-halo-8-hydroxycinchoninic acids
Assignee: GAF Chemicals Corp
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Filing: 1950-04-18
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Granted: 1951-12-18
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Expires: 1970-04-18
Abstract
No abstract record available.
Inventors
- 👤 Robert F Coles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:20
CPC Classifications
C; C07; C07D; C07D221/00; C07D221/02; C07D221/04; C07D221/18; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/50; C07D215/52; C07D219/00; C07D219/04; C07D219/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
17 words
THE PROCESS OF PREPARING 6-HALO-8-HYDROXYCINCHONINIC ACIDS SELECTED FROM THE GROUP CONSISTING OF THOSE OF THE FOLLOWING FORMULAE:
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) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |