US2553696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making water-soluble polymers of lower alkylene imines
Assignee: Union Carbide Corp
•
Filing: 1944-01-12
•
Granted: 1951-05-22
•
Expires: 1964-01-12
Abstract
No abstract record available.
Inventors
- 👤 Alexander L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C07; C07D; C07D203/00; C07D203/04; C07D203/06; C07D203/08; C07D203/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR MAKING A WATER-SOLUBLE N,N(ALKYLENE) ALKYLENE POLYAMINE OF THE FORMULA R:N* (R*NH)N*H IN WHICH R IS A LOWER ALKYLENE GROUP HAVING ADJACENT CARBON ATOMS THEREOF ATTACHED TO THE NITROGEN ATOMS AND N IS A SMALL WHOLE NUMBER LESS THAN FOUR, WHICH COMPRISES FORMING AN AQUEOUS, NON-ACIDIC TO MODERATELY ALKALINE SOLUTION OF A WATER-SOLUBLE, SECONDARY LOWER ALKYLENE IMINE AND PERMITTING SAID IMINE TO POLYMERIZE THEREIN, QUENCHING THE POLYMERIZATION REACTION BY THE ADDITION OF ALKALI TO SAID SOLUTION, AND SEPARATING THE RESULTING WATERSOLUBLE POLYMERIZATION PRODUCT FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
89 words
A PROCESS FOR MAKING A WATER-SOLUBLE N,N(ALKYLENE) ALKYLENE POLYAMINE OF THE FORMULA R:N* (R*NH)N*H IN WHICH R IS A LOWER ALKYLENE GROUP HAVING ADJACENT CARBON ATOMS THEREOF ATTACHED TO THE NITROGEN ATOMS AND N IS A SMALL WHOLE NUMBER LESS THAN FOUR, WHICH COMPRISES FORMING AN AQUEOUS, NON-ACIDIC TO MODERATELY ALKALINE SOLUTION OF A WATER-SOLUBLE, SECONDARY LOWER ALKYLENE IMINE AND PERMITTING SAID IMINE TO POLYMERIZE THEREIN, QUENCHING THE POLYMERIZATION REACTION BY THE ADDITION OF ALKALI TO SAID SOLUTION, AND SEPARATING THE RESULTING WATERSOLUBLE POLYMERIZATION PRODUCT FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US471520A
Cited
US511303A
Cited
GB435388A
Cited
US2182306A
Cited
US2296225A
Cited
US2136094A
Cited
US2212146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |