US2649388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silica filled materials
Assignee: PQ Corp
•
Filing: 1948-08-24
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Granted: 1953-08-18
•
Expires: 1968-08-24
Abstract
No abstract record available.
Inventors
- 👤 Wills John Haines
- 👤 Hazel James Frederic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/131; B; B22; B22C; B22C9/00; B22C9/12; B22C9/126; C01; C01B; C01B33/00; C01B33/113; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C03C25/00; C03C25/10; C03C25/42; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09C; C09C1/00; C09C1/28; C09C1/32; C09C3/00; C09C3/06; D; D06; D06M; D06M11/00; D06M11/77; D06M11/79; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/10; C01P2004/20; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/22; C01P2006/60; C01P2006/80; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2218/00; C03C2218/10; C03C2218/11; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE MANUFACTURE OF NON-SEGREGATING, SILICA-IMPREGNATED AND COATED MATERIALS, THE PROCESS WHICH COMPRISES FORMING A LIQUID DISPERSION OF A FINELY-DIVIDED INERT MATERIAL TO BE IMPREGNATED IN A LIQUID AQUEOUS SILICA SOL WHICH IS SUBJECT TO IRREVERSIBLE FREEZING, SUBJECTING THE SAID DISPERSION TO FREEZING TEMPERATURES UNDER CONDITIONS PRODUCING COMPLETE FREEZING WITHIN LESS THAN ONE HOUR AND BEFORE ANY SUBSTANTIAL GEL FORMATION TAKES PLACE, THAWING THE FROZEN MASS AND RECOVERING THE RESULTING SILICA-IMPREGNATED MATERIAL THEREFROM.
Claim 2
Dependent Claim
73 words
IN THE MANUFACTURE OF NON-SEGREGATING, SILICA-IMPREGNATED AND COATED MATERIALS, THE PROCESS WHICH COMPRISES FORMING A LIQUID DISPERSION OF A FINELY-DIVIDED INERT MATERIAL TO BE IMPREGNATED IN A LIQUID AQUEOUS SILICA SOL WHICH IS SUBJECT TO IRREVERSIBLE FREEZING, SUBJECTING THE SAID DISPERSION TO FREEZING TEMPERATURES UNDER CONDITIONS PRODUCING COMPLETE FREEZING WITHIN LESS THAN ONE HOUR AND BEFORE ANY SUBSTANTIAL GEL FORMATION TAKES PLACE, THAWING THE FROZEN MASS AND RECOVERING THE RESULTING SILICA-IMPREGNATED MATERIAL THEREFROM.
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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) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |