US2806879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dithiooxamide
Assignee: Wyeth Holdings LLC
•
Filing: 1954-07-13
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Granted: 1957-09-17
•
Expires: 1974-07-13
Abstract
No abstract record available.
Inventors
- 👤 Donald W Kaiser
- 👤 Richard P Welcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:30
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
AN IMPROVED METHOD OF PRODUCING SUBSTANTIALLY PURE DITHIOOXAMIDE WHICH CONSIST IN: PROVIDING AN AQUEOUS ALKALINE MENSTRUUM CONSISTING OF WATER AND SUFFICIENT BASIC CATALYST TO ESTABLISH A CONCENTRATION WITHIN THE RANGE OF FROM ABOUT 0.01 NORMAL TO ABOUT 1 NORMAL; SIMULTANEOUSLY INTRODUCING A GASEOUS MIXTURE OF CYANOGEN AND HYDROGEN SULFIDE TO SAID AQUEOUS ALKALINE MENSTRUUM; MAINTAINING A REACTION TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 0*C. TO ABOUT 100*C., AND COLLECTING SUBSTANTIALLY PURE, ORANGE PRECIPIATE OF DITHIOOXAMIDE FROM THE RESULTANT REACTION MIXTURE.
Claim 2
Dependent Claim
81 words
AN IMPROVED METHOD OF PRODUCING SUBSTANTIALLY PURE DITHIOOXAMIDE WHICH CONSIST IN: PROVIDING AN AQUEOUS ALKALINE MENSTRUUM CONSISTING OF WATER AND SUFFICIENT BASIC CATALYST TO ESTABLISH A CONCENTRATION WITHIN THE RANGE OF FROM ABOUT 0.01 NORMAL TO ABOUT 1 NORMAL; SIMULTANEOUSLY INTRODUCING A GASEOUS MIXTURE OF CYANOGEN AND HYDROGEN SULFIDE TO SAID AQUEOUS ALKALINE MENSTRUUM; MAINTAINING A REACTION TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 0*C. TO ABOUT 100*C., AND COLLECTING SUBSTANTIALLY PURE, ORANGE PRECIPIATE OF DITHIOOXAMIDE FROM THE RESULTANT REACTION MIXTURE.
References Cited (Backward Citations)
US2732401A
Cited
US2484257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |