Patent US4045344A successfully refreshed from Google Patents.
Patent US2599094A successfully refreshed from Google Patents.
US2599094A
Expired / Lapsed
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Cellulosic fibrous calcium silicate pigment, a method of making it and a sheet of paper containing it
Assignee: Vanderbilt Chemicals LLC
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Filing: 1949-12-10
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Granted: 1952-06-03
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Expires: 1969-12-10
Abstract
No abstract record available.
Inventors
- 👤 William L Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:32
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70; D21H17/67; D21H17/68
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
THE METHOD OF PRODUCING A PIGMENTED AND GELATINIZED CELLULOSIC FIBROUS STOCK PARTICULARLY ADAPTED FOR ADMIXTURE WITH UNPIGMENTED CELLULOSE FIBROUS STOCK IN THE MANUFACTURE OF PAPER WHICH COMPRISES SUBJECTING, AT ORDINARY TEMPERATURES, AN AQUEOUS SUSPENSION OF CELLULOSIC FIBERS TO THE ACTION OF A SOLUTION OF CALCIUM CHLORIDE UNTIL THE CALCIUM CHLORIDE BRINGS ABOUT A GELATINIZATION OF THE CELLULOSIC FIBERS, AND ADDING A SOLUTION OF SODIUM SILICATE TO THE GELATINIZED CELLULOSIC FIBERS CONTAINING THE CALCIUM CHLORIDE TO REACT THEREWITH AND PRECIPITATE FINELY-DIVIDED HYDRATED CALCIUM SILICATE IN AND ON THE FIBERS, THE AMOUNT OF CALCIUM CHLORIDE IN THE SOLUTION AND THE AMOUNT OF SODIUM SILICATE ADDED TO THE CELLULOSIC FIBERS BEING SUFFICIENT THAT THE AMOUNT OF PRECIPITATED HYDRATED CALCIUM SILICATE REMAINING IN AND ON THE FIBERS IS IN EXCESS OF THE WEIGHT OF THE FIBERS.
Claim 2
Independent Claim
132 words
THE METHOD OF PRODUCING A PIGMENTED AND GELATINIZED CELLULOSIC FIBROUS STOCK PARTICULARLY ADAPTED FOR ADMIXTURE WITH UNPIGMENTED CELLULOSE FIBROUS STOCK IN THE MANUFACTURE OF PAPER WHICH COMPRISES SUBJECTING, AT ORDINARY TEMPERATURES, AN AQUEOUS SUSPENSION OF CELLULOSIC FIBERS TO THE ACTION OF A SOLUTION OF CALCIUM CHLORIDE UNTIL THE CALCIUM CHLORIDE BRINGS ABOUT A GELATINIZATION OF THE CELLULOSIC FIBERS, AND ADDING A SOLUTION OF SODIUM SILICATE TO THE GELATINIZED CELLULOSIC FIBERS CONTAINING THE CALCIUM CHLORIDE TO REACT THEREWITH AND PRECIPITATE FINELY-DIVIDED HYDRATED CALCIUM SILICATE IN AND ON THE FIBERS, THE AMOUNT OF CALCIUM CHLORIDE IN THE SOLUTION AND THE AMOUNT OF SODIUM SILICATE ADDED TO THE CELLULOSIC FIBERS BEING SUFFICIENT THAT THE AMOUNT OF PRECIPITATED HYDRATED CALCIUM SILICATE REMAINING IN AND ON THE FIBERS IS IN EXCESS OF THE WEIGHT OF THE FIBERS.
Claim 3
Dependent Claim
32 words
HIGHLY-PIGMENTED GELATINIZED CELLULOSIC FIBERS PRODUCED IN ACCORDANCE WITH THE METHOD OF CLAIM 1 AND CONTAINING AN AMOUNT OF FINELYDIVIDED, PRECIPITATED, HYDRATED CALCIUM SILICATE IN EXCESS OF THE DRY WEIGHT OF THE FIBERS.
Claim 4
Dependent Claim
36 words
A NEW SHEET OF PAPER MADE OF ADMIXED FIBERS, FROM 5% TO 25% OF WHICH ARE HIGHLY PIGMENTED GELATINIZED CELLULOSIC FIBERS AS DEFINED IN CLAIM 8 AND THE REMAINDER OF THE FIBERS ARE UNGELATINIZED CELLULOSIC FIBERS.
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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |