Patent US3271107A successfully refreshed from Google Patents.
US3271107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica pigments from fluosilicic acid
Assignee: International Minerals and Chemical Corp
•
Filing: 1963-07-31
•
Granted: 1966-09-06
•
Expires: 1983-07-31
Abstract
No abstract record available.
Inventors
- 👤 John D Nickerson
- 👤 George M Burkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:36
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/186; C01P; C01P2006/00; C01P2006/22; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN THE PREPARATION OF SILICA BY THE REACTION OF FLUOSILICIC ACID WITH AMMONOUM HYDROXIDE IN AQUEOUS MEDIUM, THE IMPROVEMENT COMPRISING CARRYING OUT THE REACTION IN TWO SEPARATE STAGES WHICH COMPRISES: (A) REACTING FLUOSILICIC ACID WITH AMMONIUM HYDROXIDE IN A REACTION ZONE OF HIGH AGITATION, AND ADJUSTING THE PROPORTIONS OF THE REACTANTS TO MAINTAIN A PH IN THE RANGE OF 6.0 TO 8.0, WHEREBY A SILICACONTAINING SLURRY IS PRODUCED; (B) THEN REACTING SAID SLURRY IN A QUESCENT REATION ZONE WITH ADDITIONAL AMMONIUM HYDROXIDE IN AN AMOUNT SUFFICIENT TO PROVIDE A FINAL PH IN THE RANGE OF 8.3 TO 9.0 FOR A TIME OF ABOUT 20 MINUTES TO 120 MINUTES, AND SEPARATING PRECIPITATED SILICA FROM THE RESULTING SLURRY.
Claim 2
Dependent Claim
116 words
IN THE PREPARATION OF SILICA BY THE REACTION OF FLUOSILICIC ACID WITH AMMONOUM HYDROXIDE IN AQUEOUS MEDIUM, THE IMPROVEMENT COMPRISING CARRYING OUT THE REACTION IN TWO SEPARATE STAGES WHICH COMPRISES: (A) REACTING FLUOSILICIC ACID WITH AMMONIUM HYDROXIDE IN A REACTION ZONE OF HIGH AGITATION, AND ADJUSTING THE PROPORTIONS OF THE REACTANTS TO MAINTAIN A PH IN THE RANGE OF 6.0 TO 8.0, WHEREBY A SILICACONTAINING SLURRY IS PRODUCED; (B) THEN REACTING SAID SLURRY IN A QUESCENT REATION ZONE WITH ADDITIONAL AMMONIUM HYDROXIDE IN AN AMOUNT SUFFICIENT TO PROVIDE A FINAL PH IN THE RANGE OF 8.3 TO 9.0 FOR A TIME OF ABOUT 20 MINUTES TO 120 MINUTES, AND SEPARATING PRECIPITATED SILICA FROM THE RESULTING SLURRY.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |