Patent US2652426A successfully refreshed from Google Patents.
US2652426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkane phosphonic acids
Assignee: California Research LLC
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Filing: 1950-08-28
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Granted: 1953-09-15
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Expires: 1970-08-28
Abstract
No abstract record available.
Inventors
- 👤 Richard D Stayner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:52
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4071; C07F9/4075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE METHOD OF PREPARING A LONG-CHAIN ALKANE PHOSPHONIC ACID HAVING FROM 10 TO 18 CARBON ATOMS IN THE ALKYL GROUP ATTACHED TO THE PHOSPHORUS ATOM, SAID METHOD COMPRISING HEATING TO ITS BOILING POINT A SUBSTANTIALLY ANHYDROUS MIXTURE OF 1 MOLE OF A LONG-CHAIN ALKANE PHOSPHONYL DICHLORIDE HAVING FROM 10 TO 18 CARBON ATOMS IN THE ALKYL GROUP ATTACHED TO THE PHOSPHORUS ATOM, AND AT LEAST 2 MOLES OF A LOW MOLECULAR WEIGHT SATURATED ALIPHATIC MONOCARBOXYLIC ACID, THE ACID CHLORIDE OF WHICH BOILS AT A TEMPERATURE BELOW THE BOILING POINT OF SAID LONGCHAIN ALKANE PHOSPHONYL DICHLORIDE.
Claim 2
Independent Claim
95 words
THE METHOD OF PREPARING A LONG-CHAIN ALKANE PHOSPHONIC ACID HAVING FROM 10 TO 18 CARBON ATOMS IN THE ALKYL GROUP ATTACHED TO THE PHOSPHORUS ATOM, SAID METHOD COMPRISING HEATING TO ITS BOILING POINT A SUBSTANTIALLY ANHYDROUS MIXTURE OF 1 MOLE OF A LONG-CHAIN ALKANE PHOSPHONYL DICHLORIDE HAVING FROM 10 TO 18 CARBON ATOMS IN THE ALKYL GROUP ATTACHED TO THE PHOSPHORUS ATOM, AND AT LEAST 2 MOLES OF A LOW MOLECULAR WEIGHT SATURATED ALIPHATIC MONOCARBOXYLIC ACID, THE ACID CHLORIDE OF WHICH BOILS AT A TEMPERATURE BELOW THE BOILING POINT OF SAID LONGCHAIN ALKANE PHOSPHONYL DICHLORIDE.
References Cited (Backward Citations)
US2304157A
Cited
US2492994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |