Patent US2512810A successfully refreshed from Google Patents.
Patent US2515244A successfully refreshed from Google Patents.
US2515244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of guanidine sulfates
Assignee: Wyeth Holdings LLC
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Filing: 1946-12-24
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Granted: 1950-07-18
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Expires: 1966-12-24
Abstract
No abstract record available.
Inventors
- 👤 Johnstone S Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:15
CPC Classifications
C; C07; C07C; C07C277/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS OF PREPARING A GUANIDINE SULFATE COMPRISING REACTING CARBON DIOXIDE, AMMONIA, AND SULFUR TRIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF SUBSTANTIALLY 250*-400*C. EMPLOYING A MOLECULAR RATIO OF SUBSTANTIALLY 1 MOL OF CO2:1-2 MOLS OF SO3:2-6 MOLS OF NH3.
Claim 2
Dependent Claim
40 words
A PROCESS OF PREPARING A GUANIDINE SULFATE COMPRISING REACTING CARBON DIOXIDE, AMMONIA, AND SULFUR TRIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF SUBSTANTIALLY 250*-400*C. EMPLOYING A MOLECULAR RATIO OF SUBSTANTIALLY 1 MOL OF CO2:1-2 MOLS OF SO3:2-6 MOLS OF NH3.
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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |