US3294723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer of ethylene imine and epichlorohydrin
Assignee: Chemirad Corp
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Filing: 1965-07-09
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Granted: 1966-12-27
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Expires: 1985-07-09
Abstract
No abstract record available.
Inventors
- 👤 Goldstein Albert
- 👤 John W Brook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR PRODUCING A STABLE, WATER-SOLUBLE COPOLYMER OF ETHYLENE IMINE WITH EPICHLOROHYDRIN COMPRISING FEEDING TO A REACTION ZONE A MIXTURE OF ETHYLENE IMINE AND EPICHLOROHYDRIN IN AMOUNTS FALLING WITHIN THE AREA LIMITED BY LINES AB, BC, CD, DE, AND EA OF FIG. 1, REACTING SAID MIXTURE AT A TEMPERATURE IN THE RANGE OF ABOUT 100*C. TO 150*C. AND FURTHER HEATING THE RESULTING COPOLYMER AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 100* C. TO 150*C., AND SEPARATING SAID CO-POLYMER.
Claim 2
Dependent Claim
81 words
A PROCESS FOR PRODUCING A STABLE, WATER-SOLUBLE COPOLYMER OF ETHYLENE IMINE WITH EPICHLOROHYDRIN COMPRISING FEEDING TO A REACTION ZONE A MIXTURE OF ETHYLENE IMINE AND EPICHLOROHYDRIN IN AMOUNTS FALLING WITHIN THE AREA LIMITED BY LINES AB, BC, CD, DE, AND EA OF FIG. 1, REACTING SAID MIXTURE AT A TEMPERATURE IN THE RANGE OF ABOUT 100*C. TO 150*C. AND FURTHER HEATING THE RESULTING COPOLYMER AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 100* C. TO 150*C., AND SEPARATING SAID CO-POLYMER.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |