US2697727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing s-alkyl cyanopseudothioureas
Assignee: Wyeth Holdings LLC
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Filing: 1953-04-28
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Granted: 1954-12-21
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Expires: 1973-04-28
Abstract
No abstract record available.
Inventors
- 👤 Donald W Kaiser
- 👤 Church Dagfrid Holm-Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:43
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD OF PREPARING AN S-ALKYL CYANOPSEUDOTHIOUREA WHICH COMPRISES REACTING AN S-ALKYL PSEUDOTHIOUREA WITH CYANOGEN CHLORIDE IN A LIQUID REACTION MEDIUM AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 0* TO 20* C., AND RECOVERING THE THUS-FORMED S-ALKYL CYANOPSEUDOTHIOUREA FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
44 words
A METHOD OF PREPARING AN S-ALKYL CYANOPSEUDOTHIOUREA WHICH COMPRISES REACTING AN S-ALKYL PSEUDOTHIOUREA WITH CYANOGEN CHLORIDE IN A LIQUID REACTION MEDIUM AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 0* TO 20* C., AND RECOVERING THE THUS-FORMED S-ALKYL CYANOPSEUDOTHIOUREA FROM THE REACTION MIXTURE.
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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |