Patent US2839532A successfully refreshed from Google Patents.
US2839532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridazone compounds and process of
Assignee: —
•
Filing: —
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Granted: 1958-06-17
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Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:28
CPC Classifications
C; C07; C07D; C07D237/00; C07D237/02; C07D237/06; C07D237/10; C07D237/14; C07D417/00; C07D417/02; C07D417/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A PROCESS FOR THE MANAFACTURE OF PYRIDAZONE-(3) COMPOUNDS; WHICH COMPRISES REACTING A HYDRAZINE WHICH CONTAINS AT LEAST THREE HYDROGEN ATOMS ATTACHED TO THE NITROGEN ATOMS, SAID HYDROGEN ATOMS BEING THE ONLY REACTIVE GROUPS OF THE HYDRAZINE, WITH THE TWO COMPONENTS (A) AN A-DIOXO COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYOXAL, A-DIEKETONES AND A-KETOALDEHYDES, THE REACTIVE GROUPS OF WHICH BEING THE TWO OXO GROUPS, AND BISULFITE DERIVATIVES OF SAID DIOXO COMPOUNDS, (B) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN A-SUBSTITUTED ACETIC ACID CONTAINING AN A-METHYLENE GROUP, THE ONLY REACTIVE GROUPING OF WHICH BESIDES THE CARBOXYL GROUP BEING SAID A-METHYLENE GROUPING, AND LOWER ALKYL ESTERS THEREOF, THE REACTION BEING CARRIED OUT IN THE PRESENCE OF A BASIC CONDENSING AGENT FOR RING CLOSURE.
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE MANAFACTURE OF PYRIDAZONE-(3) COMPOUNDS; WHICH COMPRISES REACTING A HYDRAZINE WHICH CONTAINS AT LEAST THREE HYDROGEN ATOMS ATTACHED TO THE NITROGEN ATOMS, SAID HYDROGEN ATOMS BEING THE ONLY REACTIVE GROUPS OF THE HYDRAZINE, WITH THE TWO COMPONENTS (A) AN A-DIOXO COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYOXAL, A-DIEKETONES AND A-KETOALDEHYDES, THE REACTIVE GROUPS OF WHICH BEING THE TWO OXO GROUPS, AND BISULFITE DERIVATIVES OF SAID DIOXO COMPOUNDS, (B) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN A-SUBSTITUTED ACETIC ACID CONTAINING AN A-METHYLENE GROUP, THE ONLY REACTIVE GROUPING OF WHICH BESIDES THE CARBOXYL GROUP BEING SAID A-METHYLENE GROUPING, AND LOWER ALKYL ESTERS THEREOF, THE REACTION BEING CARRIED OUT IN THE PRESENCE OF A BASIC CONDENSING AGENT FOR RING CLOSURE.
Claim 3
Dependent Claim
32 words
A 4-CYANO-PYRIDAZONE-(3), BEING UNSUBSTITUTED IN 1-POSITION AND HAVING IN EACH OF THE 2,5- AND 6-POSITIONS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, LOWER ALKYL, PHENYL, HALOGENO-PHENYL, LOWER ALKYL-PHENYL AND LOWER ALKOXY-PHENYL.
Claim 4
Dependent Claim
32 words
A 4-CYANO-PYRIDAZONE-(3), BEING UNSUBSTITUTED IN 1-POSITION AND HAVING IN EACH OF THE 2,5- AND 6-POSITIONS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, LOWER ALKYL, PHENYL, HALOGENO-PHENYL, LOWER ALKYL-PHENYL AND LOWER ALKOXY-PHENYL.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |