US2808397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydroxyether amides of polyacrylic acid
Assignee: Bayer AG
•
Filing: 1953-02-16
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Granted: 1957-10-01
•
Expires: 1973-02-16
Abstract
No abstract record available.
Inventors
- 👤 Stroh Rudolf
- 👤 Ebersberger Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:16
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR THE PRODUCTION OF VISCOUS AQUEOUS SOLUTIONS OF WATE-SOLUBLE N-SUBSTITUTED HOMOPOLYACRYLAMIDES, SAID N-SUBSTITUENTS BEING THOSE OF THE FORMULA -R(-O-R-)NOH, WHEREIN R IS THE ALKYLENE RESIDUE OF AN ALPHA, BETA-ALKYLENE EPOXIDE AND N IS AN INTEGER OF AT LEAST 1 WHICH COMPRISES REACTING, IN AQUEOUS SOLUTION AND AT ELEVATED TEMPERATURE, WATER-SOLUBLE POLYACRYLAMIDE HAVING AT LEAST ONE HYDROGENATOM ATTACHED TO THE NITROGEN ATOM WITH A LOWER ALKYLENE OXIDE.
Claim 2
Dependent Claim
68 words
A PROCESS FOR THE PRODUCTION OF VISCOUS AQUEOUS SOLUTIONS OF WATE-SOLUBLE N-SUBSTITUTED HOMOPOLYACRYLAMIDES, SAID N-SUBSTITUENTS BEING THOSE OF THE FORMULA -R(-O-R-)NOH, WHEREIN R IS THE ALKYLENE RESIDUE OF AN ALPHA, BETA-ALKYLENE EPOXIDE AND N IS AN INTEGER OF AT LEAST 1 WHICH COMPRISES REACTING, IN AQUEOUS SOLUTION AND AT ELEVATED TEMPERATURE, WATER-SOLUBLE POLYACRYLAMIDE HAVING AT LEAST ONE HYDROGENATOM ATTACHED TO THE NITROGEN ATOM WITH A LOWER ALKYLENE OXIDE.
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |