Patent US3748221A successfully refreshed from Google Patents.
US3748221A
Expired / Lapsed
US
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Process of making paper containing chain extended polyamine resin compositions and paper made therefrom
Assignee: Indopco Inc
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Filing: 1971-10-28
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Granted: 1973-07-24
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Expires: 1991-10-28
Abstract
Abstract HIGH MOLECULAR WEIGHT, CHAIN EXTENDED COPOLYMIDEPOLYAMINE RESIN COMPOSITONS COMPRISING THE REACTION PRODUCT OF A CHAIN EXTENSION REAGENT WITH A COPOLYAMIDEPOLYAMINE INTERMEDIATE WHICH COMPRISES THE REACTION PRODUCT OF A LACTONE OR AN ALKYLESTER OF ACRYLIC OR METHACRYLIC ACID, A POLYALKYLENE POLYAMINE AND A CARBOXYLIC ACID REAGENT. THE RESULTING RESIN COMPOSITIONS DISPLAY GREATER VERSATILITY IN VARIOUS APPLICATIONS SUCH, FOR EXAMPLE, AS WET STRENGTH AND PIGMENT RETENTION ADDITIVES IN THE PAPER MAKING PROCESS.
Inventors
- 👤 H Stockmann
- 👤 Chaudhuri D Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:55
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55; C; C08; C08G; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 0
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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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |