US2676984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of guanidine from ammonium thiocyanate
Assignee: Wyeth Holdings LLC
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Filing: 1951-05-15
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Granted: 1954-04-27
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Expires: 1971-05-15
Abstract
No abstract record available.
Inventors
- 👤 Nat H Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:21
CPC Classifications
C; C07; C07C; C07C277/00; C07C277/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE IMPROVED METHOD OF CONVERTING AMMONIUM THIOCYANATE TO A REACTION MASS COMPRISING A GUANIDINE SULFATE THAT COMPRISES HEATING TOGETHER AMMONIUM THIOCYANATE, AMMONIA, AND SULFUR DIOXIDE THE AMMONIA AND SULFUR DIOXIDE EACH BEING EMPLOYED IN MOLAR EXCESS OVER THE AMMONIUM THIOCYANATE AT A TEMPERATURE WITHIN THE RANGE 180* TO 310* C. AND UNDER A PRESSURE OF AT LEAST 50 P.S.I.
Claim 2
Dependent Claim
59 words
THE IMPROVED METHOD OF CONVERTING AMMONIUM THIOCYANATE TO A REACTION MASS COMPRISING A GUANIDINE SULFATE THAT COMPRISES HEATING TOGETHER AMMONIUM THIOCYANATE, AMMONIA, AND SULFUR DIOXIDE THE AMMONIA AND SULFUR DIOXIDE EACH BEING EMPLOYED IN MOLAR EXCESS OVER THE AMMONIUM THIOCYANATE AT A TEMPERATURE WITHIN THE RANGE 180* TO 310* C. AND UNDER A PRESSURE OF AT LEAST 50 P.S.I.
References Cited (Backward Citations)
US2524054A
Cited
US2567955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |