Patent US3074843A successfully refreshed from Google Patents.
US3074843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating cellulose and other materials
Assignee: LINDEN LAB
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Filing: 1958-10-24
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Granted: 1963-01-22
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Expires: 1978-10-24
Abstract
No abstract record available.
Inventors
- 👤 Lagally Paul
- 👤 Lagally Herta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:28
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70; D21H17/67; D21H17/675
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PRODUCING PAPER PRODUCTS WHICH COMPRISES THE STEPS OF FORMING AN AQUEOUS SLURRY OF CELLULOSE PULP, SUBSTANTIALLY FREE OF POLYVALENT ANIONS, AND AMORPHOUS ALUMINUM HYDROXIDE PRODUCED BY PRECIPITATION OF ALUMINUM HYDROXIDE FROM AN AQUEOUS SOLUTION OF AN ALUMINUM-CONTAINING COMPOUND IN THE PRESENCE OF MONOVALENT ANIONS AND SUBSTANTIALLY IN THE ABSENCE OF NONALUMINUM-CONTAINING POLYVALENT ANIONS, AND FORMING A WEB FROM THE PRODUCT RESULTING FROM INTERACTION OF THE CELLULOSE PULP AND THE ALUMINUM HYDROXIDE, SAID ALUMINUM HYDROXIDE BEING PRESENT IN AN AMOUNT OF FROM 0.5 PERCENT TO 20 PERCENT BASED ON THE WEIGHT OF THE CELLULOSE PULP.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PRODUCING PAPER PRODUCTS WHICH COMPRISES THE STEPS OF FORMING AN AQUEOUS SLURRY OF CELLULOSE PULP, SUBSTANTIALLY FREE OF POLYVALENT ANIONS, AND AMORPHOUS ALUMINUM HYDROXIDE PRODUCED BY PRECIPITATION OF ALUMINUM HYDROXIDE FROM AN AQUEOUS SOLUTION OF AN ALUMINUM-CONTAINING COMPOUND IN THE PRESENCE OF MONOVALENT ANIONS AND SUBSTANTIALLY IN THE ABSENCE OF NONALUMINUM-CONTAINING POLYVALENT ANIONS, AND FORMING A WEB FROM THE PRODUCT RESULTING FROM INTERACTION OF THE CELLULOSE PULP AND THE ALUMINUM HYDROXIDE, SAID ALUMINUM HYDROXIDE BEING PRESENT IN AN AMOUNT OF FROM 0.5 PERCENT TO 20 PERCENT BASED ON THE WEIGHT OF THE CELLULOSE PULP.
References Cited (Backward Citations)
US1713642A
Cited
US2085129A
Cited
FR844945A
Cited
GB631483A
Cited
US2593125A
Cited
US2661288A
Cited
US2825645A
Cited
US2930106A
Cited
US2917426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |