US3126416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aryl secondary
Assignee: —
•
Filing: —
•
Granted: 1964-03-24
•
Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:09
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/46; C07F9/025; C07F9/30; C07F9/304
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD OF PURIFICATION OF A CRUDE DIARYLPHOSPHINE OXIDE WHICH COMPRISES THE STEPS OF REACTING THE SAID PHOSPHINE OXIDE WITH A LOWER ALKYL KETONE, ISOLATING THE DIARYL (HYDROXYISOALKYL) PHOSPHINE OXIDE SO FORMED AND HEATING THE SAID DIARYL (HYDROXYISOALKYL) PHOSPHINE OXIDE IN THE ABSENCE OF OXYGEN AND MOISTURE TO REGENERATE THE PURE DIARYLPHOSPHINE OXIDE.
Claim 2
Independent Claim
53 words
A METHOD OF PURIFICATION OF A CRUDE DIARYLPHOSPHINE OXIDE WHICH COMPRISES THE STEPS OF REACTING THE SAID PHOSPHINE OXIDE WITH A LOWER ALKYL KETONE, ISOLATING THE DIARYL (HYDROXYISOALKYL) PHOSPHINE OXIDE SO FORMED AND HEATING THE SAID DIARYL (HYDROXYISOALKYL) PHOSPHINE OXIDE IN THE ABSENCE OF OXYGEN AND MOISTURE TO REGENERATE THE PURE DIARYLPHOSPHINE OXIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |