Patent US3645918A successfully refreshed from Google Patents.
US3645918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers from esters salts and acids of partial anhydrides of phosphine oxide
Assignee: Monsanto Co
•
Filing: 1970-10-20
•
Granted: 1972-02-29
•
Expires: 1990-10-20
Abstract
Abstract COPOLYMERS PREPARED BY COPOLYMERIZING A POLYHYDRIC COMPOUND OR A POLYAMINE COMPOUND WITH A PARTIAL ANHYDRIDE OF AN ALKYLIDENE PHOSPHONYL PHOSHPINE OXIDE SUCH AS: 2,6-DI(NA-O-),2,4,6-TRI(O=),4-(NA-O-P(=O)(-OH)-CH2-)- 1,2,4,6-OXATRIPHOSPHORINANE OR 2-(NA-O-),2,4,6-TRI(O=),4-(C2H5-O-P(=O)(-OH)-CH2-), 6-(C2H5-O-)-1,2,4,6-OXATRIPHOSPHORINANE
Inventors
- 👤 Al F Kerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:59
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |