Patent US3523669A successfully refreshed from Google Patents.
Patent US3222245A successfully refreshed from Google Patents.
US3222245A
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US
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Polyvinylsulfonates with alum as precipitants in the protein sizing of paper
Assignee: BASF SE
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Filing: 1965-01-06
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Granted: 1965-12-07
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Expires: 1985-01-06
Abstract
No abstract record available.
Inventors
- 👤 Poschmann Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:42
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/21; D21H17/22; D21H17/63; D21H17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A PROCESS FOR THE INTERNAL SIZING OF PAPER WITH A PROTEIN SIZING SUBSTANCE OF ANIMAL ORIGIN WHEREIN A PRECIPITANT IS ADDED TO A SLURRY OF CELLULOSE FIBERS CONTAINING SAID SIZING SUBSTANCE, THE IMPROVEMENT OF ADDING 1 TO 20% BY WEIGHT, WITH REFERENCE TO THE PROTEIN SIZING AGENT, OF A WATER-SOLUBLE ADDITION POLYMER MADE UP FROM AT LEAST 10% BY WEIGHT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYLSULFONIC ACID AND ITS ALKALI METAL AND AMMONIUM SALTS, TOGETHER WITH ALUMINUM SULFATE AS SAID PRECIPITANT.
Claim 2
Dependent Claim
86 words
IN A PROCESS FOR THE INTERNAL SIZING OF PAPER WITH A PROTEIN SIZING SUBSTANCE OF ANIMAL ORIGIN WHEREIN A PRECIPITANT IS ADDED TO A SLURRY OF CELLULOSE FIBERS CONTAINING SAID SIZING SUBSTANCE, THE IMPROVEMENT OF ADDING 1 TO 20% BY WEIGHT, WITH REFERENCE TO THE PROTEIN SIZING AGENT, OF A WATER-SOLUBLE ADDITION POLYMER MADE UP FROM AT LEAST 10% BY WEIGHT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYLSULFONIC ACID AND ITS ALKALI METAL AND AMMONIUM SALTS, TOGETHER WITH ALUMINUM SULFATE AS SAID PRECIPITANT.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |