Patent US3344142A successfully refreshed from Google Patents.
US3344142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dichlorination of 3-aminopyrazinoic acid esters
Assignee: Merck and Co Inc
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Filing: 1965-11-03
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Granted: 1967-09-26
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Expires: 1985-11-03
Abstract
No abstract record available.
Inventors
- 👤 Burwell F Powell
- 👤 Edward W Tristram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:48
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/10; C07D241/14; C07D241/24; C07D241/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS WHEREIN CHLORINE IS CAUSED TO REACT WITH AN ESTER OF 3-AMINOPYRAZINOIC ACID IN THE PRESENCE OF A POLAR NON-PROTIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF ACETONITRILE, DIMETHYLFORMAMIDE, DIMETHYLACETAMIDE, DIOXANE, TETRAHYDROFURAN, ETHYLENE DICHLORIDE, A MIXTURE OF CARBON TETRACHLORIDE AND A SMALL AMOUNT OF DIMETHYLFORMAMIDE, AND A MIXTURE OF CARBON TETRACHLORIDE AND A SMALL AMOUNT OF ACETONITRILE AND AT A TEMPERATURE RANGING BETWEEN ROOM TEMPERTURE AND A REFLUX TEMPERATURE TO FORM AN ESTER OF 3-AMINO-5,6-DICHLOROPYRAZINOIC ACID.
Claim 2
Dependent Claim
77 words
A PROCESS WHEREIN CHLORINE IS CAUSED TO REACT WITH AN ESTER OF 3-AMINOPYRAZINOIC ACID IN THE PRESENCE OF A POLAR NON-PROTIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF ACETONITRILE, DIMETHYLFORMAMIDE, DIMETHYLACETAMIDE, DIOXANE, TETRAHYDROFURAN, ETHYLENE DICHLORIDE, A MIXTURE OF CARBON TETRACHLORIDE AND A SMALL AMOUNT OF DIMETHYLFORMAMIDE, AND A MIXTURE OF CARBON TETRACHLORIDE AND A SMALL AMOUNT OF ACETONITRILE AND AT A TEMPERATURE RANGING BETWEEN ROOM TEMPERTURE AND A REFLUX TEMPERATURE TO FORM AN ESTER OF 3-AMINO-5,6-DICHLOROPYRAZINOIC ACID.
References Cited (Backward Citations)
US3185686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |