US2784207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of o, omicron-dimethyl omicron-phenyl thiophosphates
Assignee: Wyeth Holdings LLC
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Filing: 1954-01-29
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Granted: 1957-03-05
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Expires: 1974-01-29
Abstract
No abstract record available.
Inventors
- 👤 Geoghegan John Thomas
- 👤 Jr James Beverley Mcpherson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:31
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C07F9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN AN IMPROVED PROCESS FOR PREPARING AN O,O-DIMETHYL O-PHENYL THIOPHOSPHATE PRODUCT OF HIGH YIELD AND PURITY BY REACTING SUBSTANTIALLY EQUIMOLAR QUANTITIES OF A PHENOL AND ANHYDROUS O,O-DIMETHYL CHLOROTHIOPHOSPHATE IN AN AROMATIC HYDROCARBON DILUENT AND IN THE PRESENCE OF AN ANHYDROUS ACID BINDING AGENT, THE IMPROVEMENT WHICH CONSISTS IN THE STEPS OF: REACTING SAID COMPONENTS IN THE PRESENCE OF FROM 0.002 TO 0.005 MOLE OF CUPROUS CHLORIDE CATALYST PER MOLE OF O,O-DIMETHYL CHLOROTHIOPHOSPHATE UNDER REFLUX WITH AZEROTROPIC WATER REMOVAL AT SUBATMOSPHERIC PRESSUER.
Claim 2
Dependent Claim
81 words
IN AN IMPROVED PROCESS FOR PREPARING AN O,O-DIMETHYL O-PHENYL THIOPHOSPHATE PRODUCT OF HIGH YIELD AND PURITY BY REACTING SUBSTANTIALLY EQUIMOLAR QUANTITIES OF A PHENOL AND ANHYDROUS O,O-DIMETHYL CHLOROTHIOPHOSPHATE IN AN AROMATIC HYDROCARBON DILUENT AND IN THE PRESENCE OF AN ANHYDROUS ACID BINDING AGENT, THE IMPROVEMENT WHICH CONSISTS IN THE STEPS OF: REACTING SAID COMPONENTS IN THE PRESENCE OF FROM 0.002 TO 0.005 MOLE OF CUPROUS CHLORIDE CATALYST PER MOLE OF O,O-DIMETHYL CHLOROTHIOPHOSPHATE UNDER REFLUX WITH AZEROTROPIC WATER REMOVAL AT SUBATMOSPHERIC PRESSUER.
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |