Patent US3128223A successfully refreshed from Google Patents.
US3128223A
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Process for improving the retention of mineral fillers in the formation of paper fleeces
Assignee: Hoechst AG
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Filing: 1961-10-24
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Granted: 1964-04-07
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Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 Rosenberg Guido Von
- 👤 Jochinke Hellmut
- 👤 Huber Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:09
CPC Classifications
D; D21; D21H; D21H23/00; D21H17/00; D21H17/63; D21H17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR IMPROVING THE RETENTION OF MINERAL FILLERS IN THE FORMATION OF PAPER FLEECES FROM AN AQUEOUS CELLULOSE PULP WHICH COMPRISES ADDING TO THE PULP CONTAINING A FILLER PRIOR TO THE SHEET FORMATION AS A HYDROGELFORMING SUBSTANCE AT LEAST 0.5% BY WEIGHT CALCULATED ON THE WEIGHT OF THE CELLULOSE OF A BASIC ALUMINUM CHLORIDE OF THE FORMULA AL2(OH)5CL.3H2O.
Claim 2
Dependent Claim
59 words
A PROCESS FOR IMPROVING THE RETENTION OF MINERAL FILLERS IN THE FORMATION OF PAPER FLEECES FROM AN AQUEOUS CELLULOSE PULP WHICH COMPRISES ADDING TO THE PULP CONTAINING A FILLER PRIOR TO THE SHEET FORMATION AS A HYDROGELFORMING SUBSTANCE AT LEAST 0.5% BY WEIGHT CALCULATED ON THE WEIGHT OF THE CELLULOSE OF A BASIC ALUMINUM CHLORIDE OF THE FORMULA AL2(OH)5CL.3H2O.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |