US2966495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of nu,nu'-bis-(thiocarbamyl)-hydrazine and 2-amino-5-mercapto-1, 3, 4-thiadiazole
Assignee: Wyeth Holdings LLC
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Filing: 1955-10-27
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Granted: 1960-12-27
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Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 Song John
- 👤 Fitchett Gilmer Trower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:21
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C07D285/125; C07D285/135
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
A PROCESS FOR THE PRODUCTION OF N,N''-BIS-(THIOCARBAMYL)-HYDRAZINE WHICH COMPRISES ADMIXING AN ALKALI METAL HYDROXIDE WITH AN AQUEOUS SLURRY OF HYDRAZINE SULFATE, ADDING AT LEAST A STOICHIOMETRIC AMOUNT OF A SOLUBLE THIOCYANATE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM THIOCYANATE, SODIUM THIOCYANATE, AND POTASSIUM THIOCYANATE, THEN ADDING AT LEAST ABOUT ONE MOL OF SULFURIC ACID PER MOL OF SAID ALKALI METAL HYDROXIDE AND SEPARATING THE THUS FORMED N,N''-BIS-(THIOCARBOMYL)-HYDRAZINE.
Claim 2
Dependent Claim
67 words
A PROCESS FOR THE PRODUCTION OF N,N''-BIS-(THIOCARBAMYL)-HYDRAZINE WHICH COMPRISES ADMIXING AN ALKALI METAL HYDROXIDE WITH AN AQUEOUS SLURRY OF HYDRAZINE SULFATE, ADDING AT LEAST A STOICHIOMETRIC AMOUNT OF A SOLUBLE THIOCYANATE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM THIOCYANATE, SODIUM THIOCYANATE, AND POTASSIUM THIOCYANATE, THEN ADDING AT LEAST ABOUT ONE MOL OF SULFURIC ACID PER MOL OF SAID ALKALI METAL HYDROXIDE AND SEPARATING THE THUS FORMED N,N''-BIS-(THIOCARBOMYL)-HYDRAZINE.
Claim 3
Dependent Claim
92 words
A PROCESS FOR THE PRODUCTION OF 2-AMINO-5-MERCAPTO 1,3,4-THIADIAZOLE WHICH COMPRISES ADMIXING FROM 1/4 TO 1 MOL OF AN ALKALI METAL HYDROXIDE WITH AN AQUEOUS SLURRY OF HYDRAZINE SULFATE, AND TO THE REACTIONN MIXTURE ADDING AT LEAST ABOUT A STOICHIOMETRIC AMOUNT OF A SOLUBLE THIOCYANATE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM THIOCYANATE, SODIUM THIOCYANATE AND POTASSIUM THIOCYANATE, THEN ADDING AT LEAST ONE MOL OF SULFURIC ACID PER MOL OF SAID ALKALI METAL HYDROXIDE, SEPARATING THE THUS FORMED N,N''-BIS-(THIOCARBAMYL)-HYDRAZINE, ADDING WITHOUT DRYING 1- TO 12-NORMAL HYDROCHLORIC ACID AND HEATING UNTIL 2-AMINO-5-MERCAPTO-1,3,4-THIADIAZOLE IS FORMED.
Claim 4
Dependent Claim
92 words
A PROCESS FOR THE PRODUCTION OF 2-AMINO-5-MERCAPTO 1,3,4-THIADIAZOLE WHICH COMPRISES ADMIXING FROM 1/4 TO 1 MOL OF AN ALKALI METAL HYDROXIDE WITH AN AQUEOUS SLURRY OF HYDRAZINE SULFATE, AND TO THE REACTIONN MIXTURE ADDING AT LEAST ABOUT A STOICHIOMETRIC AMOUNT OF A SOLUBLE THIOCYANATE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM THIOCYANATE, SODIUM THIOCYANATE AND POTASSIUM THIOCYANATE, THEN ADDING AT LEAST ONE MOL OF SULFURIC ACID PER MOL OF SAID ALKALI METAL HYDROXIDE, SEPARATING THE THUS FORMED N,N''-BIS-(THIOCARBAMYL)-HYDRAZINE, ADDING WITHOUT DRYING 1- TO 12-NORMAL HYDROCHLORIC ACID AND HEATING UNTIL 2-AMINO-5-MERCAPTO-1,3,4-THIADIAZOLE IS FORMED.
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) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |