US3280218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft polymers of ethylenimine onto a polyacrylic or polymethacrylic acid backbone
Assignee: Dow Chemical Co
•
Filing: 1963-09-06
•
Granted: 1966-10-18
•
Expires: 1983-09-06
Abstract
No abstract record available.
Inventors
- 👤 Donald J Endsley
- 👤 Billy W Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:37
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08F; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD FOR PREPARING WATER-SOLUBLE GRAFT POLYMERS OF ETHYLENIMINE AND A POLYMERIC INITIATOR SELECTED FROM THE GROUP CONSISTING OF POLYACRYLIC ACID, POLYMETHACRYLIC ACID AND MIXTURE THEREOF, SAID POLYMERIC INITIATOR HAVING A 1 PERCENT SOLUTION VISCOSITY AT 100*F. OF FROM ABOUT 0.8 CENTISTOKE TO ABOUT 8.0 CENTISTOKES WHICH COMPRISES HEATING TOGETHER AT A TEMPERATURE OF FROM ABOUT 70* TO 100*C.; (A) FROM ABOUT 99 TO 70 PARTS BY WEIGHT OF ETHYLENIMINE, AND (B) FROM ABOUT 1 TO 30 PARTS BY WEIGHT OF SAID POLYMERIC INITIATOR, IN AQUEOUS SOLUTION, SAID SOLUTION CONTAINING FROM ABOUT 25 TO 50 WEIGHT PERCENT WATER, FOR A PERIOD OF TIME SUFFICIENT TO YIELD A WATER-SOLUBLE GRAFT POLYMER, SAID WATER SOLUBLE GRAFT POLYMERS HAVING A ONE PERCENT SOLUTION VISCOSITY AT 100*F. OF FROM ABOUT 0.8 CENTISOKE TO ABOUT 4.0 CENTISTOKES.
Claim 2
Independent Claim
132 words
A METHOD FOR PREPARING WATER-SOLUBLE GRAFT POLYMERS OF ETHYLENIMINE AND A POLYMERIC INITIATOR SELECTED FROM THE GROUP CONSISTING OF POLYACRYLIC ACID, POLYMETHACRYLIC ACID AND MIXTURE THEREOF, SAID POLYMERIC INITIATOR HAVING A 1 PERCENT SOLUTION VISCOSITY AT 100*F. OF FROM ABOUT 0.8 CENTISTOKE TO ABOUT 8.0 CENTISTOKES WHICH COMPRISES HEATING TOGETHER AT A TEMPERATURE OF FROM ABOUT 70* TO 100*C.; (A) FROM ABOUT 99 TO 70 PARTS BY WEIGHT OF ETHYLENIMINE, AND (B) FROM ABOUT 1 TO 30 PARTS BY WEIGHT OF SAID POLYMERIC INITIATOR, IN AQUEOUS SOLUTION, SAID SOLUTION CONTAINING FROM ABOUT 25 TO 50 WEIGHT PERCENT WATER, FOR A PERIOD OF TIME SUFFICIENT TO YIELD A WATER-SOLUBLE GRAFT POLYMER, SAID WATER SOLUBLE GRAFT POLYMERS HAVING A ONE PERCENT SOLUTION VISCOSITY AT 100*F. OF FROM ABOUT 0.8 CENTISOKE TO ABOUT 4.0 CENTISTOKES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |