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Patent US2535173A successfully refreshed from Google Patents.
US2535173A
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3-phosphonopropane-1, 1-dicarboxylic acid esters and method of preparation
Assignee: Uniroyal Inc
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Filing: 1949-02-25
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Granted: 1950-12-26
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Expires: 1969-02-25
Abstract
No abstract record available.
Inventors
- 👤 Pliny O Tawney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:10
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
49 words
THE PROCESS WHICH COMPRISES EFFECTING ADDITION REACTION OF A DIALKYL ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF MALONIC ACID AND MONO-ALKYL MALONIC ACIDS AND A DIALKYL ESTER OF ETHENEPHOSPHONIC ACID IN THE PRESENCE OF A BASIC CATALYST AND THEREBY FORMING A COMPOUND HAVING THE TYPE FORMULA
Claim 2
Dependent Claim
49 words
THE PROCESS WHICH COMPRISES EFFECTING ADDITION REACTION OF A DIALKYL ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF MALONIC ACID AND MONO-ALKYL MALONIC ACIDS AND A DIALKYL ESTER OF ETHENEPHOSPHONIC ACID IN THE PRESENCE OF A BASIC CATALYST AND THEREBY FORMING A COMPOUND HAVING THE TYPE FORMULA
References Cited (Backward Citations)
US2356754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |