US3281216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing amorphous saltfree silica powder capable of forming a sol in aqueous lower alkyl amine solutions
Assignee: ChampionX LLC
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Filing: 1961-11-03
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Granted: 1966-10-25
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Expires: 1981-11-03
Abstract
No abstract record available.
Inventors
- 👤 Mindick Morris
- 👤 Harold I Patzelt
- 👤 Lewis E Reven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/145; C01B33/18; C01B33/181; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE METHOD OF PRODUCING AN AMORPHOUS SALT-FREE NON-SPHEROIDAL SILICA POWDER HAVING AT LEAST ONE LINEAR DIMENSION OF 0.5-50 MICRONS AND COMPOSED OF WEAKLY BONDED, DISCRETE SALT-FREE SILICA PARTICLES A SURFACE AREA OF AT LEAST 120 M.2/G., SAID POWDER CAPABLE OF FORMING A SOL UPON SLURRYING IN AQUEOUS SOLUTIONS OF LOWER ALKYL AMINES CONTAINING LESS THAN 6 CARBON ATOMS, WHICH COMPRISES THE STEPS OF PROVIDING A SALT-FREE SILICA SOL CONTAINING DENSE, DISCRETEE SILICA PARTICLES HAVING A SURFACE AREA OF AT LEAST 120 M.2/G. AS A DISPERSED PHASE, UNIFORMLY DISPERSED IN A LIQUID PHASE, AND SUBJECTING SAID SOL TO FLASH EVAPORATION WHEREBY THE LIQUID PHASE IS RAPIDLY EVAPORATED FROM THE DISPERSED PHASE AND SAID AMORPHOUS SILICA POWDER IS FORMED.
Claim 2
Independent Claim
117 words
THE METHOD OF PRODUCING AN AMORPHOUS SALT-FREE NON-SPHEROIDAL SILICA POWDER HAVING AT LEAST ONE LINEAR DIMENSION OF 0.5-50 MICRONS AND COMPOSED OF WEAKLY BONDED, DISCRETE SALT-FREE SILICA PARTICLES A SURFACE AREA OF AT LEAST 120 M.2/G., SAID POWDER CAPABLE OF FORMING A SOL UPON SLURRYING IN AQUEOUS SOLUTIONS OF LOWER ALKYL AMINES CONTAINING LESS THAN 6 CARBON ATOMS, WHICH COMPRISES THE STEPS OF PROVIDING A SALT-FREE SILICA SOL CONTAINING DENSE, DISCRETEE SILICA PARTICLES HAVING A SURFACE AREA OF AT LEAST 120 M.2/G. AS A DISPERSED PHASE, UNIFORMLY DISPERSED IN A LIQUID PHASE, AND SUBJECTING SAID SOL TO FLASH EVAPORATION WHEREBY THE LIQUID PHASE IS RAPIDLY EVAPORATED FROM THE DISPERSED PHASE AND SAID AMORPHOUS SILICA POWDER IS FORMED.
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |