Patent US3250811A successfully refreshed from Google Patents.
US3250811A
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US
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Methylol derivatives of tris(2-carbamoylethyl)phosphine oxide
Assignee: Individual
•
Filing: 1963-02-08
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Granted: 1966-05-10
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Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Leon H Chance
- 👤 Jr George L Drake
- 👤 Wilson A Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:40
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
AN N-METHYLOL DERIVATIVE OF TRIS(2-CARBAMOYLETHYL) PHOSPHINE OXIDE PREPARED BY REACTING TRIS(2-CARBAMOYLETHYL) PHOSPHINE OXIDE WITH FORMALDEHYDE WITHIN A RANGE OF MOLE RATIOS OF FROM 1:1 TO 1:6 IN AN AQUEOUS ALKALINE SOLUTION AT ROOM TEMPERATURE FOR A TIME SUFFICIENT TO FORM SAID N-METHYLOL DERIVATIVE.
Claim 2
Dependent Claim
43 words
AN N-METHYLOL DERIVATIVE OF TRIS(2-CARBAMOYLETHYL) PHOSPHINE OXIDE PREPARED BY REACTING TRIS(2-CARBAMOYLETHYL) PHOSPHINE OXIDE WITH FORMALDEHYDE WITHIN A RANGE OF MOLE RATIOS OF FROM 1:1 TO 1:6 IN AN AQUEOUS ALKALINE SOLUTION AT ROOM TEMPERATURE FOR A TIME SUFFICIENT TO FORM SAID N-METHYLOL DERIVATIVE.
References Cited (Backward Citations)
US2203493A
Cited
US2234889A
Cited
US2961465A
Cited
US3005013A
Cited
US3052719A
Cited
US3067251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |