Patent US2579810A successfully refreshed from Google Patents.
US2579810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing substituted hydroxymethylphosphonic esters
Assignee: Research Corp
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Filing: 1949-08-18
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Granted: 1951-12-25
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Expires: 1969-08-18
Abstract
No abstract record available.
Inventors
- 👤 Ellis K Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:09
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS WHICH COMPRISES REACTIG A PHOSPHITE DIESTER WITH A CARBONYL COMPOUND IN THE PRESENCE OF A BASIC CATALYST OF THE GROUP CONSISTING OF ORGANIC TERTIARY NITROGEN BASES AND ALKALI AND ALKALINE EARTH SALTS OF WEAK ACIDS AND RECOVERING THE SUBSTITUTED HYDROXYMETHYLPHOSPHONIC ACID DIESTER THEREBY PRODUCED.
Claim 2
Dependent Claim
46 words
A PROCESS WHICH COMPRISES REACTIG A PHOSPHITE DIESTER WITH A CARBONYL COMPOUND IN THE PRESENCE OF A BASIC CATALYST OF THE GROUP CONSISTING OF ORGANIC TERTIARY NITROGEN BASES AND ALKALI AND ALKALINE EARTH SALTS OF WEAK ACIDS AND RECOVERING THE SUBSTITUTED HYDROXYMETHYLPHOSPHONIC ACID DIESTER THEREBY PRODUCED.
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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |