US2593213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alpha hydroxy phosphonates
Assignee: Shell Development Co
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Filing: 1948-10-26
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Granted: 1952-04-15
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Expires: 1968-10-26
Abstract
No abstract record available.
Inventors
- 👤 Alan R Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:00
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4015; C07F9/4006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A PROCESS WHICH COMPRISES MIXING A DIALKYL ACID ESTER OF PHOSPHOROUS ACID AND A SATURATED ALIPHATIC ALDEHYDE AND MAINTAINING THE MIXTURE AT TEMPERATURES OF FROM ABOUT 0* C. TO 200* C. TO EFFECT REACTION WHEREBY THERE IS PRODUCED DIALKYL ESTER OF A HYDROXY-SUBSTITUTED SATURATED ALIPHATIC PHOSPHONIC ACID HAVING BOTH HYDROXY AND PHOSPHORUS DIRECTLY SUBSTITUTED ON A SINGLE CARBON ATOM.
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) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |