Patent US3323980A successfully refreshed from Google Patents.
US3323980A
Expired / Lapsed
US
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Process of sizing paper with water-soluble vinylimidazoline polymers
Assignee: BASF SE
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Filing: 1963-03-08
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Granted: 1967-06-06
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Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
- 👤 Poschmann Franz
- 👤 Wolf Hans
- 👤 Marx Matthias
- 👤 Wilhelm Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:19
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; C; C09; C09J; C09J139/00; C09J139/04; D21H17/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A PROCESS FOR THE STOCK SIZING OF PAPER THE IMPROVEMENT WHICH COMPRISES: ADDING TO THE PAPER STOCK AN AQUEOUS SOLUTION CONTAINING FROM 0.1 TO 2% BY WEIGHT BASED ON THE WEIGHT OF THE FIBER CONTENT OF THE STOCK OF A WATER-SOLUBLE POLYMER HAVING A K VALUE OF AT LEAST 20, AT LEAST 5% BY WEIGHT OF SAID POLYMER BEING DERIVED FROM A COMPOUND SELECTED FROM THE GROUP CONSISTING OF NVINYLIMIDAZOLINE, N-VINYLMETHYLIMIDAZOLINE, N-ACRYLOYLIMIDAZOLINE, N-VINYLIMIDAZOLE, 4-METHYL-N-VINYLIMIDAZOLE, N-VINYLBENZIMIDAZOLE, N-ACRYLOYLIMIDAZOLE, AND THE SALTS AND QUATERNIZATION PRODUCTS THEREOF.
Claim 2
Dependent Claim
84 words
IN A PROCESS FOR THE STOCK SIZING OF PAPER THE IMPROVEMENT WHICH COMPRISES: ADDING TO THE PAPER STOCK AN AQUEOUS SOLUTION CONTAINING FROM 0.1 TO 2% BY WEIGHT BASED ON THE WEIGHT OF THE FIBER CONTENT OF THE STOCK OF A WATER-SOLUBLE POLYMER HAVING A K VALUE OF AT LEAST 20, AT LEAST 5% BY WEIGHT OF SAID POLYMER BEING DERIVED FROM A COMPOUND SELECTED FROM THE GROUP CONSISTING OF NVINYLIMIDAZOLINE, N-VINYLMETHYLIMIDAZOLINE, N-ACRYLOYLIMIDAZOLINE, N-VINYLIMIDAZOLE, 4-METHYL-N-VINYLIMIDAZOLE, N-VINYLBENZIMIDAZOLE, N-ACRYLOYLIMIDAZOLE, AND THE SALTS AND QUATERNIZATION PRODUCTS THEREOF.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |