US4452721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspensions containing microfibrillated cellulose
Assignee: Rayonier Inc
•
Filing: 1982-11-15
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Granted: 1984-06-05
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Expires: 2002-11-15
Abstract
Abstract A suspension of a finely divided material in a liquid suspending medium which swells cellulose, the suspension containing microfibrillated cellulose in an amount sufficient to produce a stable, homogeneous suspension. The finely divided material is a dense solid such as coal or sand.
Inventors
- 👤 Albin F. Turbak
- 👤 Fred W. Snyder
- 👤 Karen R. Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:12
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; C08L; C08L1/00; C08L1/02; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; D; D21; D21C; D21C9/00; D21C9/001; C08J2301/00; C08J2301/02; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/929; Y10S516/93
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A suspension of a finely divided dense solid selected from the group consisting of sand and coal material in a liquid suspending medium which swells cellulose, said suspension containing microfibrillated cellulose in an amount sufficient to produce a stable, homogeneous suspension.
Claim 2
Dependent Claim
41 words
A suspension of a finely divided dense solid selected from the group consisting of sand and coal material in a liquid suspending medium which swells cellulose, said suspension containing microfibrillated cellulose in an amount sufficient to produce a stable, homogeneous suspension.
Claim 3
Dependent Claim
48 words
The suspension of claim 1 in which the microfibrillated cellulose is present in an amount ranging from 0.25% to the major ingredient of the suspension, said proportions being based on the weight of cellulose solids present as microfibrillated cellulose as compared to the total weight of the suspension.
Claim 4
Dependent Claim
12 words
The suspension of claim 1 in which the dense solid is sand.
Claim 5
Dependent Claim
12 words
The suspension of claim 1 in which the dense solid is coal.
References Cited (Backward Citations)
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |