US2786757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a paper product
Assignee: Columbia Southern Chemical Corp
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Filing: 1956-06-28
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Granted: 1957-03-26
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Expires: 1976-06-28
Abstract
No abstract record available.
Inventors
- 👤 Louis B Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:16
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70; D21H17/67; D21H17/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD OF PREPARING PAPER WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF CELLULOSIC PAPER PULP AND AN ACID SUBSTANCE WHICH FORMS A WATER INSOLUBLE ALKALINE EARTH METAL SALT, REACTING WITH SAID SLURRY FINELY DIVIDED ALKALINE EARTH METAL SILICATE AND PRODUCING PAPER FROM THE RESULTING SLURRY, THE AMOUNT OF SAID ACIDIC SUBSTANCE BEING SUFFICIENT TO REACT WITH AT LEAST HALF THE ALKALINE EARTH METAL SILICATE.
Claim 2
Independent Claim
64 words
A METHOD OF PREPARING PAPER WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF CELLULOSIC PAPER PULP AND AN ACID SUBSTANCE WHICH FORMS A WATER INSOLUBLE ALKALINE EARTH METAL SALT, REACTING WITH SAID SLURRY FINELY DIVIDED ALKALINE EARTH METAL SILICATE AND PRODUCING PAPER FROM THE RESULTING SLURRY, THE AMOUNT OF SAID ACIDIC SUBSTANCE BEING SUFFICIENT TO REACT WITH AT LEAST HALF THE ALKALINE EARTH METAL SILICATE.
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) | 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 |