Patent US2692891A successfully refreshed from Google Patents.
US2692891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of thiophosphate esters
Assignee: Pittsburgh Coke and Chemical Co
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Filing: 1950-11-24
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Granted: 1954-10-26
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Expires: 1970-11-24
Abstract
No abstract record available.
Inventors
- 👤 James W Young
- 👤 Hensel Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:15
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A PROCESS FOR THE PRODUCTION OF MIXED THIOPHOSPHORIC ESTERS, THE STEPS WHICH COMPRISE PROVIDING AN AQUEOUS SOLUTION OF A COMPOUND HAVING THE FROMULA: NAOR'', WHEREIN R'' IS AN ARYL RADICAL, CONTAINING A CATALYST FROM THE GROUP CONSISTING OF COPPER METAL POWDER AND COPPER SALTS, VIGOROUSLY AGITATING THE SOLUTION, MIXING A CHLORIDE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
56 words
IN A PROCESS FOR THE PRODUCTION OF MIXED THIOPHOSPHORIC ESTERS, THE STEPS WHICH COMPRISE PROVIDING AN AQUEOUS SOLUTION OF A COMPOUND HAVING THE FROMULA: NAOR'', WHEREIN R'' IS AN ARYL RADICAL, CONTAINING A CATALYST FROM THE GROUP CONSISTING OF COPPER METAL POWDER AND COPPER SALTS, VIGOROUSLY AGITATING THE SOLUTION, MIXING A CHLORIDE HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
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US2471464A
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US2520393A
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US2536647A
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US2624745A
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US2575225A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |