US3652203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneous preparation of carbonyl sulfide and ammonium thiocyanate
Assignee: Sagami Chemical Research Institute
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Filing: 1970-09-29
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Granted: 1972-03-28
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Expires: 1990-09-29
Abstract
Abstract A process for the simultaneous preparation of carbonyl sulfide and ammonium thiocyanate, which comprises heating and reacting urea with carbon disulfide at liquid phase, in aliphatic monohydric alcohol of one to four carbon atoms serving as the reaction medium.
Inventors
- 👤 Shizuo Nakamura
- 👤 Masanobu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:22
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/20; C01B; C01B32/00; C01B32/70; C01B32/77
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
The process of claim 1, wherein the reaction temperature ranges from 100* to 190* C.
Claim 2
Dependent Claim
15 words
The process of claim 1, wherein the reaction temperature ranges from 120* to 160* C.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein the reaction time ranges from 10 minutes to 5 hours.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein the quantity of reaction medium is at least sufficient to maintain the reaction mixture at homogeneous phase at the reaction temperature.
Claim 5
Dependent Claim
11 words
The process of claim 1, wherein the reaction medium is methanol.
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) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |