Patent US2711370A successfully refreshed from Google Patents.
US2711370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sized, filled paper
Assignee: Wyeth Holdings LLC
•
Filing: 1954-04-12
•
Granted: 1955-06-21
•
Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 Lurie David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
A METHOD FOR MANUFACTURING SIZED PAPER OF IMPROVED OPACITY AND WEIGHT WHILE DISCHARGING A WHITE WATER HAVING A DISSOLVED SULFATE ION CONTENT NOT MATERIALLY GREATER THAN THE DISSOLVED SULFATE ION CONTENT OF THE MAKEUP WATER, WHICH COMPRISES FORMING A SUSPENSION OF PAPERMAKING CELLULOSIC FIBERS IN MAKE-UP WATER HAVING A DISSOLVED SULFARE ION CONTENT OF LESS THAN ABOUT 800 PARTS PER MILLION, SIZING SAID FIBERS IN SAID SUSPENSION BY ADDITION OF ROSIN SIZE AND ALUM THERETO, ADDING BARIUM CHLORIDE IN AMOUNT AT LEAST ABOUT STOICHIOMETRICALLY EQUIVALENT TO THE SULFATE CONTENT OF SAID ALUM, WHEREBY THE DISSOLVED SULFATE IONS INTRODUCED BY SAID ALUM ARE PRECIPIITATE AS BARIUM SULFATE PARTICLES, ADDING FROM ABOUT 1/4% TO 1/2% OF SODIUM ALUMINATE BASED ON THE DRY WEIGHT OF THE FIBERS, AGING THE SUSPENSION UNTIL A FLOC OF ALUMINUM HYDRATE FORMS WHICH FLOCULATES AND ADSORBS SAID BARIUM SULFATE PARTICLES, AND THE DISSOLVED SULFATE ION CONTENT OF THE WATER IS DECREASED TO A VALUE NOT MATERIALLY GREATER THAN THE DISSOLVED SULFATE ION CONTENTS OF THE MAKE-UP WATER, AND SHEATING AND DRYING SAID FIBERS TO FORM PAPER.
Claim 2
Independent Claim
178 words
A METHOD FOR MANUFACTURING SIZED PAPER OF IMPROVED OPACITY AND WEIGHT WHILE DISCHARGING A WHITE WATER HAVING A DISSOLVED SULFATE ION CONTENT NOT MATERIALLY GREATER THAN THE DISSOLVED SULFATE ION CONTENT OF THE MAKEUP WATER, WHICH COMPRISES FORMING A SUSPENSION OF PAPERMAKING CELLULOSIC FIBERS IN MAKE-UP WATER HAVING A DISSOLVED SULFARE ION CONTENT OF LESS THAN ABOUT 800 PARTS PER MILLION, SIZING SAID FIBERS IN SAID SUSPENSION BY ADDITION OF ROSIN SIZE AND ALUM THERETO, ADDING BARIUM CHLORIDE IN AMOUNT AT LEAST ABOUT STOICHIOMETRICALLY EQUIVALENT TO THE SULFATE CONTENT OF SAID ALUM, WHEREBY THE DISSOLVED SULFATE IONS INTRODUCED BY SAID ALUM ARE PRECIPIITATE AS BARIUM SULFATE PARTICLES, ADDING FROM ABOUT 1/4% TO 1/2% OF SODIUM ALUMINATE BASED ON THE DRY WEIGHT OF THE FIBERS, AGING THE SUSPENSION UNTIL A FLOC OF ALUMINUM HYDRATE FORMS WHICH FLOCULATES AND ADSORBS SAID BARIUM SULFATE PARTICLES, AND THE DISSOLVED SULFATE ION CONTENT OF THE WATER IS DECREASED TO A VALUE NOT MATERIALLY GREATER THAN THE DISSOLVED SULFATE ION CONTENTS OF THE MAKE-UP WATER, AND SHEATING AND DRYING SAID FIBERS TO FORM PAPER.
References Cited (Backward Citations)
US157198A
Cited
US1806474A
Cited
US1885185A
Cited
US2315892A
Cited
US2559221A
Cited
US2548513A
Cited
US2599093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |