US2957910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing ureas
Assignee: Texaco Inc
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Filing: 1958-12-26
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Granted: 1960-10-25
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Expires: 1978-12-26
Abstract
No abstract record available.
Inventors
- 👤 John A Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:12
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN A PROCESS FOR PREPARING UREAS FROM CARBON MONOXIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND ALKYL PRIMARY MONOAMINES HAVING UP TO 10 CARBON ATOMS AT A TEMPERATURE BETWEEN ABOUT 150 AND 300*F., AT A PRESSURE FROM 200 TO 2000 P.S.I.G. AND AT A MOL RATIO OF COMPOUND: CARBON MONOXIDE BETWEEN ABOUT 10.1 AND 0.1:1 IN A REACTION ZONE CONTAINING INERT LIQUID REACTION VEHICLE, SAID VEHICLE COMPOSING BETWEEN 40 AND 95 WT. PERCENT OF THE REACTION MIXTURE, THE IMPROVEMENT WHICH COMPRISES SUPPLYING TO THE REACTION ZONE A POLYSULFIDE HAVING 3 TO 5 SULFUR ATOMS SELECTED FROM THE GROUP CONSISTING OF DI-N-BUTYL POLYSULFIDE, DI-TERTIARY BUTYL POLYSULFIDE, DIALLYL POLYSULFIDE, DICYCLOHEXYL POLYSULFIDE, DIPHENYL POLYSULFIDE, DI-P-TOYL POLYSULFIDE, DIBENZYL POLYSULFIDE, AND 4,4-DIMETHYL-1,2POLYTHIACYCLOPENTANE IN A MOL RATIO OF BETWEEN ABOUT 0.1 AND 10 GRAMS PER MOL OF SAID COMPOUND PER GRAM ATOM OF SULFUR IN SAID POLYSULFIDE.
Claim 2
Dependent Claim
145 words
IN A PROCESS FOR PREPARING UREAS FROM CARBON MONOXIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND ALKYL PRIMARY MONOAMINES HAVING UP TO 10 CARBON ATOMS AT A TEMPERATURE BETWEEN ABOUT 150 AND 300*F., AT A PRESSURE FROM 200 TO 2000 P.S.I.G. AND AT A MOL RATIO OF COMPOUND: CARBON MONOXIDE BETWEEN ABOUT 10.1 AND 0.1:1 IN A REACTION ZONE CONTAINING INERT LIQUID REACTION VEHICLE, SAID VEHICLE COMPOSING BETWEEN 40 AND 95 WT. PERCENT OF THE REACTION MIXTURE, THE IMPROVEMENT WHICH COMPRISES SUPPLYING TO THE REACTION ZONE A POLYSULFIDE HAVING 3 TO 5 SULFUR ATOMS SELECTED FROM THE GROUP CONSISTING OF DI-N-BUTYL POLYSULFIDE, DI-TERTIARY BUTYL POLYSULFIDE, DIALLYL POLYSULFIDE, DICYCLOHEXYL POLYSULFIDE, DIPHENYL POLYSULFIDE, DI-P-TOYL POLYSULFIDE, DIBENZYL POLYSULFIDE, AND 4,4-DIMETHYL-1,2POLYTHIACYCLOPENTANE IN A MOL RATIO OF BETWEEN ABOUT 0.1 AND 10 GRAMS PER MOL OF SAID COMPOUND PER GRAM ATOM OF SULFUR IN SAID POLYSULFIDE.
References Cited (Backward Citations)
US2857431A
Cited
US2857430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |