US2562830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivatives
Assignee: —
•
Filing: —
•
Granted: 1951-07-31
•
Expires: 1968-07-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:15
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/41; A61K31/415; A61K31/4152; C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26; C07D401/00; C07D401/02; C07D401/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A PROCESS WHICH COMPRISES CONDENSING DIETHYL MALONATE WITH 1:2-DI-PHENYL-HYDRAZINE IN THE PRESENCE OF AN ALKALI METAL ALCOHOLATE AND TREATING THE ISOLATED 1:2-DI-PHENYL-3:5-DIOXOPYRAZOLIDINE IN THE PRESENCE OF A HYDROGENATION CATALYST WITH HYDROGEN AND WITH A CARBONYL COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
39 words
A PROCESS WHICH COMPRISES CONDENSING DIETHYL MALONATE WITH 1:2-DI-PHENYL-HYDRAZINE IN THE PRESENCE OF AN ALKALI METAL ALCOHOLATE AND TREATING THE ISOLATED 1:2-DI-PHENYL-3:5-DIOXOPYRAZOLIDINE IN THE PRESENCE OF A HYDROGENATION CATALYST WITH HYDROGEN AND WITH A CARBONYL COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
12 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA
Claim 4
Dependent Claim
12 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS 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) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |