US2653976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guanidine sulfate from urea and sulfur dioxide
Assignee: Wyeth Holdings LLC
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Filing: 1951-05-15
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Granted: 1953-09-29
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Expires: 1971-05-15
Abstract
No abstract record available.
Inventors
- 👤 Johnstone S Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:01
CPC Classifications
C; C07; C07C; C07C277/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS WHICH COMPRISES HEATING TOGETHER UREA AND SULFUR DIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 190* TO 300* C. IN A CLOSED VESSEL UNDER A PRESSURE OF AT LEAST 100 P. S. I. WHEREBY A REACTION MASS CONTAINING A GUANIDINE SULFATE IS FORMED.
Claim 2
Dependent Claim
46 words
THE PROCESS WHICH COMPRISES HEATING TOGETHER UREA AND SULFUR DIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 190* TO 300* C. IN A CLOSED VESSEL UNDER A PRESSURE OF AT LEAST 100 P. S. I. WHEREBY A REACTION MASS CONTAINING A GUANIDINE SULFATE IS FORMED.
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) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |