US2722550A
Expired / Lapsed
US
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Preparation of n, n'-substituted ureas
Assignee: Goodrich Corp
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Filing: 1951-10-18
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Granted: 1955-11-01
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Expires: 1971-10-18
Abstract
No abstract record available.
Inventors
- 👤 Charles S Schollenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:16
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/32; C07D207/325; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/1836; C07C273/1845; C07D295/00; C07D295/16; C07D295/20; C07D295/215
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
THE METHOD OF PREPARING N,N''-TETRA-SUBSTITUTED UREAS AND THIOUREAS WHICH COMPRISES HEATING TO REFLUX A MIXTURE CONTAINING WATER, AND A COMPOUND SELECTED FROM THE CLASS CONSISTING OF N-ORIGANICALLY DISUBSTITUTED CARBAMYL HALIDES AND N-ORGANICALLY DISUBSTITUTED THIOCARBAMYL HALIDES, SAID COMPOUND HAVING AT LEAST ONE N ATOM CONNECTED TO TWO CARBON ATOMS OTHER THAN THE CARBONYL CARBON, AND AT LEAST ONE MOLECULAR EQUIVALENT BASED ON THE ACID HALIDE OF AN INORGANIC ALKALINE MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL HYDROXIDES, CARBONATES, AND BICARBONATES AND ALKALINE EARTH METAL HYDROXIDES, MAINTAINING THE REACTANTS AT REFLUX TEMPERATURE UNTIL THE TETRA-SUBSTITUTED DERIVATIVE IS FORMED AND RECOVERING SAID DERIVATIVE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |