US2681920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phosphonates
Assignee: Shell Development Co
•
Filing: 1951-01-16
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Granted: 1954-06-22
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Expires: 1971-01-16
Abstract
No abstract record available.
Inventors
- 👤 John L Van Winkle
- 👤 Rupert C Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:32
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C10; C10M; C10M3/00; C10M2223/00; C10M2223/06; C10M2223/065; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE PREPARATION OF A PHOSPHONATE, THE STEP WHICH COMPRISES REACTING AT A TEMPERATURE OF FROM ABOUT 50* C. TO 250* C. AN ALKALI METAL SALT OF A DIESTER OF PHOSPHOROUS ACID WITH AN ESTER OF FATTY ACID COMPOSED ONLY OF HYDROGEN, CARBON AND OXYGEN, TO PRODUCE AN ESTER OF A PHOSPHONIC ACID WHEREIN THE CARBON ATOM THAT IS DIRECTLY LINKED TO THE PHOSPHORUS ATOM IS THE CARBON ATOM THAT, IN THE CARBOXYLIC ACID ESTER, WAS DIRECTLY ATTACHED TO THE ACYLOXY GROUP BY A BOND TO THE OXY OXYGEN ATOM OF THE CARBONYLOXY GROUP THEREOF.
Claim 2
Dependent Claim
95 words
IN THE PREPARATION OF A PHOSPHONATE, THE STEP WHICH COMPRISES REACTING AT A TEMPERATURE OF FROM ABOUT 50* C. TO 250* C. AN ALKALI METAL SALT OF A DIESTER OF PHOSPHOROUS ACID WITH AN ESTER OF FATTY ACID COMPOSED ONLY OF HYDROGEN, CARBON AND OXYGEN, TO PRODUCE AN ESTER OF A PHOSPHONIC ACID WHEREIN THE CARBON ATOM THAT IS DIRECTLY LINKED TO THE PHOSPHORUS ATOM IS THE CARBON ATOM THAT, IN THE CARBOXYLIC ACID ESTER, WAS DIRECTLY ATTACHED TO THE ACYLOXY GROUP BY A BOND TO THE OXY OXYGEN ATOM OF THE CARBONYLOXY GROUP THEREOF.
References Cited (Backward Citations)
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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) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |