US2786758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing siliceous pigment and method of preparing paper from such pigment
Assignee: Columbia Southern Chemical Corp
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Filing: 1954-08-26
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Granted: 1957-03-26
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Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Louis B Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:26
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70; D21H17/67; D21H17/68
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A METHOD OF PREPARING A COMPOSITION OF MATTER WHICH COMPRISES REACTING A FINELY DIVIDED, WATER INSOLUBLE ALKALINE EARTH METAL SILICTE HAVING AN AVERAGE PARTICLE SIZE LESS THAN 1 MICRON IN AN AQUEOUS MEDIUM INITIALLY CONTAINING AT LEAST 0.1 GRAM PER LITER OF CALCIUM SULFATE WITH ALUMINUM SULFATE SUFFICIENT TO RECT WITH AT LEAST A SUBSTANTIAL PORTION OF THE WATER INSOLUBLE ALKALINE EARTH METAL SILICATE.
Claim 2
Independent Claim
64 words
A METHOD OF PREPARING A COMPOSITION OF MATTER WHICH COMPRISES REACTING A FINELY DIVIDED, WATER INSOLUBLE ALKALINE EARTH METAL SILICTE HAVING AN AVERAGE PARTICLE SIZE LESS THAN 1 MICRON IN AN AQUEOUS MEDIUM INITIALLY CONTAINING AT LEAST 0.1 GRAM PER LITER OF CALCIUM SULFATE WITH ALUMINUM SULFATE SUFFICIENT TO RECT WITH AT LEAST A SUBSTANTIAL PORTION OF THE WATER INSOLUBLE ALKALINE EARTH METAL SILICATE.
Claim 3
Independent Claim
94 words
THE METHOD OF PREPARING PAPER WITH COMPRISES REACTING A FINELY DIVIDED WATER INSOLUBLE CALCIUM SILICATE IN AN AQUEOUS PULP MEDIUM CONTAINING INITIALLY AT LEAST ABOUT 0.1 GRAM OF CALCIUM SULFATE PER LITER WITH SUFFICIENT ALUMINUM SULFATE TO REACT WITH AT LEAST A MAJOR PORITON OF SAID WATER INSOLUBLE CALCIUM SILICATE, FORMING PAPER FROM THE RESULTING PULP SLURRY WITH CONSEQUENT RECOVERY OF WHITE WATERS, ESTABLISH A FURTHER PULP CONTAINING AQUEOUS MEDIUM CONTAINING AT LEAST A PORTION OF SAID WHITE WATERS AND REACTING FINELY DIVIDED WATER INSOLUBLE CALCIUM SILICATE WITH ALUMINUM SULFATE IN SAID FURTHER MEDIUM.
Claim 4
Independent Claim
94 words
THE METHOD OF PREPARING PAPER WITH COMPRISES REACTING A FINELY DIVIDED WATER INSOLUBLE CALCIUM SILICATE IN AN AQUEOUS PULP MEDIUM CONTAINING INITIALLY AT LEAST ABOUT 0.1 GRAM OF CALCIUM SULFATE PER LITER WITH SUFFICIENT ALUMINUM SULFATE TO REACT WITH AT LEAST A MAJOR PORITON OF SAID WATER INSOLUBLE CALCIUM SILICATE, FORMING PAPER FROM THE RESULTING PULP SLURRY WITH CONSEQUENT RECOVERY OF WHITE WATERS, ESTABLISH A FURTHER PULP CONTAINING AQUEOUS MEDIUM CONTAINING AT LEAST A PORTION OF SAID WHITE WATERS AND REACTING FINELY DIVIDED WATER INSOLUBLE CALCIUM SILICATE WITH ALUMINUM SULFATE IN SAID FURTHER MEDIUM.
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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) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |