Patent US2640830A successfully refreshed from Google Patents.
US2640830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
S-hydroxy-x
Assignee: —
•
Filing: —
•
Granted: 1953-06-02
•
Expires: 1970-06-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:50
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF 5-HYDROXY-4:7-PHENONTHROLINE, 4:7-PHENANTHROLINE HAVING IN 5-POSITION A LOWER ALKOXY GROUP, 4:7-PHENTHROLINE HAVING IN 5-POSITION A PHENOXY GROUP, AND THE ACIDS SALTS OF THE SAID COMPOUNDS.
Claim 2
Dependent Claim
32 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF 5-HYDROXY-4:7-PHENONTHROLINE, 4:7-PHENANTHROLINE HAVING IN 5-POSITION A LOWER ALKOXY GROUP, 4:7-PHENTHROLINE HAVING IN 5-POSITION A PHENOXY GROUP, AND THE ACIDS SALTS OF THE SAID COMPOUNDS.
References Cited (Backward Citations)
US2163946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |