Patent US2567676A successfully refreshed from Google Patents.
US2567676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of guanidine sulfate
Assignee: Wyeth Holdings LLC
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Filing: 1949-03-15
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Granted: 1951-09-11
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Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Nat H Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:50
CPC Classifications
C; C07; C07C; C07C277/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
THE PROCESS OF PREPARING A GUANIDINE SULFATE COMPRISING REACTING UREA WITH A MEMBER OF THE GROUP CONSISTING OF DIAMMONIUM IMIDODISULFONATE AND TRIAMMONIUM IMIDODISULFONATE AT A TEMPERATURE WITHIN THE RANGE OF SUBSTANTIALLY 190*-300* C.
Claim 2
Dependent Claim
33 words
THE PROCESS OF PREPARING A GUANIDINE SULFATE COMPRISING REACTING UREA WITH A MEMBER OF THE GROUP CONSISTING OF DIAMMONIUM IMIDODISULFONATE AND TRIAMMONIUM IMIDODISULFONATE AT A TEMPERATURE WITHIN THE RANGE OF SUBSTANTIALLY 190*-300* C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |