US2840610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing corrosion inhibitors
Assignee: Texaco Inc
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Filing: 1956-07-02
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Granted: 1958-06-24
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Expires: 1976-07-02
Abstract
No abstract record available.
Inventors
- 👤 Tillman R Pullig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:25
CPC Classifications
C; C07; C07C; C07C335/00; C07C335/04; C07C335/06; C07C335/10; C07C335/12; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23F11/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS FOR PREPARING A SYMMETRICAL DISUBSTITUTED THIOUREA BY REACTION OF CARBON DISULFIDE WITH A PHENYL-SUBTITUTED LOWER ALKYL PRIMARY AMINE, THE LOWER ALKYL GROUP OF SAID AMINE HAVING FROM 1 TO 3 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES FORMING A REACTION MIXTURE CONSISTING ESSENTIALLY OF SUBSTANTIALLY STOICHIOMETRIC QUANTITIES OF THE AMINE AND CARBON DISULFIDE, SAID REACTION MIXTURE BEING FORMED WITHOUT INERT SOLVENT, AND MAINTAINING SAID REACTION MIXTURE UNDER AUTOGENOUS PRESSURE AT A TEMPERATURE IN THE RANGE OF ABOUT 115* TO ABOUT 270*C. UNTIL A SYMMETRICAL DISUBSTITUTED THIOUREA IS FORMED.
Claim 2
Dependent Claim
90 words
IN A PROCESS FOR PREPARING A SYMMETRICAL DISUBSTITUTED THIOUREA BY REACTION OF CARBON DISULFIDE WITH A PHENYL-SUBTITUTED LOWER ALKYL PRIMARY AMINE, THE LOWER ALKYL GROUP OF SAID AMINE HAVING FROM 1 TO 3 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES FORMING A REACTION MIXTURE CONSISTING ESSENTIALLY OF SUBSTANTIALLY STOICHIOMETRIC QUANTITIES OF THE AMINE AND CARBON DISULFIDE, SAID REACTION MIXTURE BEING FORMED WITHOUT INERT SOLVENT, AND MAINTAINING SAID REACTION MIXTURE UNDER AUTOGENOUS PRESSURE AT A TEMPERATURE IN THE RANGE OF ABOUT 115* TO ABOUT 270*C. UNTIL A SYMMETRICAL DISUBSTITUTED THIOUREA IS FORMED.
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |