Patent US2955309A successfully refreshed from Google Patents.
US4756801A
Expired / Lapsed
US
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Paper-making method and a combination of ingredients to be used in it
Assignee: Kemira Oyj
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Filing: 1986-10-24
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Granted: 1988-07-12
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Expires: 2006-10-24
Abstract
Abstract In a paper-making method cellulose is suspended in water and the obtained pulp suspension is dewatered in order to form a fiber web or a fiber sheet, water being removed from a pulp suspension which contains an organic polymer and an inorganic oligomeric Ti, Zr, Sn or B compound.
Inventors
- 👤 Olli J. Jokinen
- 👤 Lars Petander
- 👤 Pirkko J. Virta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:57
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/03; D21H17/05; D21H17/12; D21H17/63; D21H17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
In the method of making paper from a suspension of cellulose pulp and a filler in water, wherein water is removed from said pulp suspension and a web or a sheet is formed, the improvement which consists of increasing the filler retention and overall retention by removing water from said pulp suspension in the presence of a retention aid which consists of a cationic starch and an inorganic oligomeric Ti +4 compound from titanyl sulfate in the amount of 0.1-15% calculated on the basis of the dry weight of the pulp, at a pH of 4-8 wherein said cationic starch and said inorganic oligomeric Ti +4 compound are present in a weight ratio of 0.2-20:1.
Claim 2
Dependent Claim
115 words
In the method of making paper from a suspension of cellulose pulp and a filler in water, wherein water is removed from said pulp suspension and a web or a sheet is formed, the improvement which consists of increasing the filler retention and overall retention by removing water from said pulp suspension in the presence of a retention aid which consists of a cationic starch and an inorganic oligomeric Ti +4 compound from titanyl sulfate in the amount of 0.1-15% calculated on the basis of the dry weight of the pulp, at a pH of 4-8 wherein said cationic starch and said inorganic oligomeric Ti +4 compound are present in a weight ratio of 0.2-20:1.
References Cited (Backward Citations)
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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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |