US3009955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of thiosemicarbazide
Assignee: Berlin-Brandenburg Academy of Sciences and Humanities
•
Filing: 1959-07-08
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Granted: 1961-11-21
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Expires: 1979-07-08
Abstract
No abstract record available.
Inventors
- 👤 Rieche Alfred
- 👤 Hilgetag Gunter
- 👤 Martini Anneliese
- 👤 Phillipson Rainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:49
CPC Classifications
C; C07; C07C; C07C337/00; C07C337/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR THE PREPARATION OF THIOSEMICARBAZIDE WHICH COMPRISES HEATING HYDRAZINE THIOCYANATE IN AN AQUEOUS SOLUTION ADJUSTED TO A PH OF 3-4 TO A TEMPERATURE IN THE RANGE OF 75 TO 105*C. IN THE PRESENCE OF A CATALYST IN THE AMOUNT FROM 0.1 TO 20% BY WEIGHT CALCULATED ON THE HYDRAZINE THIOCYANATE, SAID CATALYST HAVING THE FORMULA
Claim 2
Dependent Claim
57 words
A PROCESS FOR THE PREPARATION OF THIOSEMICARBAZIDE WHICH COMPRISES HEATING HYDRAZINE THIOCYANATE IN AN AQUEOUS SOLUTION ADJUSTED TO A PH OF 3-4 TO A TEMPERATURE IN THE RANGE OF 75 TO 105*C. IN THE PRESENCE OF A CATALYST IN THE AMOUNT FROM 0.1 TO 20% BY WEIGHT CALCULATED ON THE HYDRAZINE THIOCYANATE, SAID CATALYST HAVING THE FORMULA
References Cited (Backward Citations)
US2450406A
Cited
US2731496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |