Patent US3077430A successfully refreshed from Google Patents.
US3077430A
Expired / Lapsed
US
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Paper containing acrylamide copolymer
Assignee: Wyeth Holdings LLC
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Filing: 1959-09-25
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Granted: 1963-02-12
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Expires: 1979-09-25
Abstract
No abstract record available.
Inventors
- 👤 Sewell T Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:36
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/37; D21H17/42; D21H17/43; D21H17/455
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
PROCESS FOR MANUFACTURING PAPER OF IMPROVED DRY STRENGTH, WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF CELLULOSIC PAPERMAKING FIBERS, ADDING A SMALL AMOUNT OF A CATIONIC, WATER-SOLUBLE DIALLYLMELAMINE-ACRYLAMIDE ACRYLIC ACID COPOLYMER AS STRENGTHENING AGENT THEREBY ADSORBING SAID COPOLYMER ON SAID FIBERS, ADDING ALUM AS COMPLEXING AGENT FOR SAID COPOLYMER, SHEET SAID FIBERS TO FORM A WATERLAID WEB, AND DRYING SAID WEB.
References Cited (Backward Citations)
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Cited
US2712004A
Cited
US2729560A
Cited
US2727015A
Cited
US2801169A
Cited
US2972560A
Cited
US2930106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |