US3754984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica sol compositions and use for coating
Assignee: ChampionX LLC
•
Filing: 1972-02-14
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Granted: 1973-08-28
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Expires: 1992-02-14
Abstract
Abstract Silica sol compositions especially useful for coatings are prepared by homogenizing an aqueous silica sol with a silica powder. The compositions are particularly useful for improving the frictionizing of paper.
Inventors
- 👤 C Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:16
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/0072; C; C01; C01B; C01B33/00; C01B33/113; D21H19/00; D21H19/36; D21H19/38; D21H19/40; D21H27/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
17 words
A process of claim 1 in which said surface is a paper made from felted cellulose fibers.
Claim 2
Dependent Claim
34 words
A process as claimed in claim 1 in which said coating is applied at the rate of 0.05 to 0.5 pound of said coating per 1, 000 ft.2 of said surface, expressed as SiO2.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1 in which the weight ratio of SiO2 from the aqueous colloidal sol to SiO2 fine silica powder is approximately 4:1 to 6:1.
Claim 4
Dependent Claim
19 words
A cellulosic material having a surface coated with a dried coating of a composition as claimed in claim 1.
Claim 5
Dependent Claim
19 words
A cellulosic material having a surface coated with a dried coating of a composition as claimed in claim 3.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |