Patent US3372046A successfully refreshed from Google Patents.
US3372046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica pigments and process for producing same
Assignee: Individual
•
Filing: 1965-05-24
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Granted: 1968-03-05
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Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Oliver W Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:07
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A SILICA PIGMENT WHICH HAS BEEN PREPARED BY CONTACTING AN AQUEOUS SOLUTION OF ALKALI METAL SILICATE HAVING A TEMPERATURE OF 80$10*C. WITH DILUTE CARBON DIOXIDE HAVING A TEMPERATURE IN EXCESS OF 374*C. DERIVED FROM A HYDROCARBON RICH FLAME, SAID PIGMENT CONTAINING CONSTITUENTS DERIVED FROM THE CRACKING OF HYDROCARBON IN THE HYDROCARBON RICH FLAME AND RETAINED BY HE PIGMENT DURING FILTERING AND WASHING.
Claim 2
Dependent Claim
62 words
A SILICA PIGMENT WHICH HAS BEEN PREPARED BY CONTACTING AN AQUEOUS SOLUTION OF ALKALI METAL SILICATE HAVING A TEMPERATURE OF 80$10*C. WITH DILUTE CARBON DIOXIDE HAVING A TEMPERATURE IN EXCESS OF 374*C. DERIVED FROM A HYDROCARBON RICH FLAME, SAID PIGMENT CONTAINING CONSTITUENTS DERIVED FROM THE CRACKING OF HYDROCARBON IN THE HYDROCARBON RICH FLAME AND RETAINED BY HE PIGMENT DURING FILTERING AND WASHING.
Claim 3
Dependent Claim
75 words
IN A PROCESS FOR PREPARING A SILICA PIGMENT WHICH INCLUDES THE STEPS OF (A) MIXING AN AQUEOUS ALKALI METAL SILICATE SOLUTION AND CARBON DIOXIDE TO FORM A SLURRY OF WET SILICA PIGMENT, THE IMPROVEMENT WHICH CONSISTS IN: (B) CONDUCITNG AT LEAST THE LATTER PART OF THE MIXING IN STEP (A) AT LEAST IN PART BY INTRODUCING HOT GASEOUS COMBUSTION PRODUCTS OF HYDROCARBON COMPRISING CARBON DIOXIDE INTO THE SOLUTION AT A TEMPERATURE IN EXCESS OF 374*C.
Claim 4
Dependent Claim
75 words
IN A PROCESS FOR PREPARING A SILICA PIGMENT WHICH INCLUDES THE STEPS OF (A) MIXING AN AQUEOUS ALKALI METAL SILICATE SOLUTION AND CARBON DIOXIDE TO FORM A SLURRY OF WET SILICA PIGMENT, THE IMPROVEMENT WHICH CONSISTS IN: (B) CONDUCITNG AT LEAST THE LATTER PART OF THE MIXING IN STEP (A) AT LEAST IN PART BY INTRODUCING HOT GASEOUS COMBUSTION PRODUCTS OF HYDROCARBON COMPRISING CARBON DIOXIDE INTO THE SOLUTION AT A TEMPERATURE IN EXCESS OF 374*C.
References Cited (Backward Citations)
US3085861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |