US2557980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dithiobiuret
Assignee: Wyeth Holdings LLC
•
Filing: 1949-03-15
•
Granted: 1951-06-26
•
Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Leslic C Lane
- 👤 Richard W Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:47
CPC Classifications
C; C07; C07C; C07C335/00; C07C335/04; C07C335/24; C07C335/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE METHOD COMPRISING HEATING A METAL DICYANIMIDE, WATER, AND HYDROGEN SULFIDE AT A TEMPERATURE OF AT LEAST 55* C., AT A PH IN EXCESS OF 7 BUT NOT EXCEEDING ABOUT 10.2 WHEREBY A REACTION MASS COMPRISING DITHIOBIURET IS FORMED.
Claim 2
Independent Claim
39 words
THE METHOD COMPRISING HEATING A METAL DICYANIMIDE, WATER, AND HYDROGEN SULFIDE AT A TEMPERATURE OF AT LEAST 55* C., AT A PH IN EXCESS OF 7 BUT NOT EXCEEDING ABOUT 10.2 WHEREBY A REACTION MASS COMPRISING DITHIOBIURET IS FORMED.
References Cited (Backward Citations)
US2371112A
Cited
US2410862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |