Patent US2651656A successfully refreshed from Google Patents.
US2651656A
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Process of preparing tetraalkyl esters of 1, 2-ethanediphosphonic acid
Assignee: Uniroyal Inc
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Filing: 1950-04-17
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Granted: 1953-09-08
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Expires: 1970-04-17
Abstract
No abstract record available.
Inventors
- 👤 Elbert C Ladd
- 👤 Marlin P Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:26
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; A; A01; A01N; A01N57/00; A01N57/18; A01N57/20; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4025; C07F9/4028; C10M2223/00; C10M2223/06; C10M2223/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE PROCESS OF MAKING A TETRAALKYL ESTER OF 1,2-ETHANEDIPHOSPHONIC ACID WHICH COMPRISES HEATING A MIXTURE OF A DIALKYL PHOSPHITE AND A DIALKYL ESTER OF ETHENEPHOSPHONIC ACID IN THE PRESENCE OF A BASIC CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METALS AND THEIR OXIDES, HYDROXIDES AND ALCOHOLATES, AND RECOVERING SAID TETRAALKYL ESTER FROM THE RESULTING REACTION MIXTURE.
Claim 2
Dependent Claim
60 words
THE PROCESS OF MAKING A TETRAALKYL ESTER OF 1,2-ETHANEDIPHOSPHONIC ACID WHICH COMPRISES HEATING A MIXTURE OF A DIALKYL PHOSPHITE AND A DIALKYL ESTER OF ETHENEPHOSPHONIC ACID IN THE PRESENCE OF A BASIC CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METALS AND THEIR OXIDES, HYDROXIDES AND ALCOHOLATES, AND RECOVERING SAID TETRAALKYL ESTER FROM THE RESULTING REACTION MIXTURE.
References Cited (Backward Citations)
US2478390A
Cited
US2492994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |