Patent US5557776A successfully refreshed from Google Patents.
Patent US3346632A successfully refreshed from Google Patents.
US3346632A
Expired / Lapsed
US
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Method for preparing thioformamide
Assignee: Merck and Co Inc
•
Filing: 1964-09-28
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Granted: 1967-10-10
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Expires: 1984-09-28
Abstract
No abstract record available.
Inventors
- 👤 Roger J Tull
- 👤 Leonard M Weinstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:42
CPC Classifications
C; C07; C07C; C07C327/00; C07C327/38; C07C327/40; C07C327/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE PROCESS FOR PREPARING THIOFORMAMIDE WHICH COMPRISES TREATING HYDROGEN CYANIDE WITH HYDROGEN SULFIDE AT A TEMPERATURE OF ABOUT 0-150*C. AND IN THE PRESENCE OF A BASE, SAID BASE BEING OTHER THAN A MEMBER OF THE GROUP CONSISTING OF PRIMARY AMINE AND SECONDARY AMINE AND HAVING A PKA VALUE OF 5-12.
Claim 2
Dependent Claim
50 words
THE PROCESS FOR PREPARING THIOFORMAMIDE WHICH COMPRISES TREATING HYDROGEN CYANIDE WITH HYDROGEN SULFIDE AT A TEMPERATURE OF ABOUT 0-150*C. AND IN THE PRESENCE OF A BASE, SAID BASE BEING OTHER THAN A MEMBER OF THE GROUP CONSISTING OF PRIMARY AMINE AND SECONDARY AMINE AND HAVING A PKA VALUE OF 5-12.
References Cited (Backward Citations)
US2280578A
Cited
US2806879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |