Patent US2953584A successfully refreshed from Google Patents.
US2953584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphinic acid derivatives and methods for preparing same
Assignee: Wyeth Holdings LLC
•
Filing: 1957-06-27
•
Granted: 1960-09-20
•
Expires: 1977-06-27
Abstract
No abstract record available.
Inventors
- 👤 Sheldon A Buckler
- 👤 Vernon P Wystrach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:07
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/301; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
A PHOSPHINIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF THE BIS(1-ALKYL-1CARBOXY-1-HYDROXYMETHYL)PHOSPHINIC ACID CHARACTERIZED BY THE FORMULA
Claim 2
Dependent Claim
17 words
A PHOSPHINIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF THE BIS(1-ALKYL-1CARBOXY-1-HYDROXYMETHYL)PHOSPHINIC ACID CHARACTERIZED BY THE FORMULA
Claim 3
Dependent Claim
51 words
A PROCESS FOR PRODUCING A BIS-1-ALKYL-1-CARBOXY-1HYDROXYMETHYL) PHOSPHINIC ACID WHICH COMPRISES, REACTING AT LEAST TWO MOL PROPORTIONS OF AN A-KETOALKONIC ACID CONTAINING OF FROM 3 TO 19 CARBON ATOMS WITH ABOUT ONE MOL PROPORTION OF HYPOPHOSPHOROUS ACID AT A TEMPERATURE UP TO ABOUT 100*C., AND RECOVERING THE RESULTANT BIS (1ALKYL-1-CARBOXY-1-HYDROXYMETHYL) PHOSPHINIC ACID.
Claim 4
Dependent Claim
51 words
A PROCESS FOR PRODUCING A BIS-1-ALKYL-1-CARBOXY-1HYDROXYMETHYL) PHOSPHINIC ACID WHICH COMPRISES, REACTING AT LEAST TWO MOL PROPORTIONS OF AN A-KETOALKONIC ACID CONTAINING OF FROM 3 TO 19 CARBON ATOMS WITH ABOUT ONE MOL PROPORTION OF HYPOPHOSPHOROUS ACID AT A TEMPERATURE UP TO ABOUT 100*C., AND RECOVERING THE RESULTANT BIS (1ALKYL-1-CARBOXY-1-HYDROXYMETHYL) PHOSPHINIC ACID.
References Cited (Backward Citations)
CH69243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |