US4297163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying of potassium silicate
Assignee: PQ Corp
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Filing: 1980-01-07
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Granted: 1981-10-27
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Expires: 2000-01-07
Abstract
Abstract Potassium silicate solutions combined with silanes that contain a hydrophilic functionality can be spray dried effectively to provide free-flowing powdered products.
Inventors
- 👤 Jeffrey R. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:21
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/16; B01D1/18; Y; Y10; Y10S; Y10S159/00; Y10S159/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
In the process of spray drying potassium silicate solution to obtain powders, comprising the steps of atomizing said potassium silicate solution in a spray drying tower and subjecting the resulting droplets to elevated temperatures in said spray tower thereby removing water from the droplets and drying them: the improvement consisting of dispersing a hydrophilic silane in said potassium silicate before atomizing the solution, wherein 0.05 to 2.5 parts by weight of the hydrophilic silane are added for each 100 parts by weight of potassium silicate solids contained in said potassium silicate solution.
Claim 2
Dependent Claim
92 words
In the process of spray drying potassium silicate solution to obtain powders, comprising the steps of atomizing said potassium silicate solution in a spray drying tower and subjecting the resulting droplets to elevated temperatures in said spray tower thereby removing water from the droplets and drying them: the improvement consisting of dispersing a hydrophilic silane in said potassium silicate before atomizing the solution, wherein 0.05 to 2.5 parts by weight of the hydrophilic silane are added for each 100 parts by weight of potassium silicate solids contained in said potassium silicate solution.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the hydrophilic silane is selected from that group of silanes which contain acrylate, epoxy, amine or carboxylate groups.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |