US3337299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica pigments and process for producing same
Assignee: Individual
•
Filing: 1965-05-24
•
Granted: 1967-08-22
•
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
2026-10-28 09:49
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/929; Y10S516/931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A PROCESS FOR PREPARING A SILICA PIGMENT WHICH INCLUDES THE STEPS OF (A) MIXING AN AQUEOUS SODIUM SILICATE SOLUTION AND CARBON DIOXIDE TO FORM A SLURRY OF WET SILICA PIGMENT, AND (B) SUBJECTING THE SAID SLURRY TO AFTER TREATMENT INCLUDING FILTERING, THE IMPROVEMENT WHICH COMPRISES: (C) CONDUCTING AT LEAST THE LATTER PART OF THE MIXING IN STEP (A) UNDER CONDITIONS OF SHEAR ESSENTIALLY AS LOW AS THAT PRODUCED BY ROTATION AT 50 R.P.M. IN A REACTOR OF 3 FOOT INSIDE DIAMETER, OF AN AGITATING ARM WHICH IS 6 INCHES ABOVE THE BOTTOM OF THE REACTOR AND 2 1/2 FEET LONG BY 1 1/2 INCHES HIGH IN CROSS SECTION, WHEREBY THERE IS PRODUCED A WET SILICA PIGMENT OF A STRUCTURE HAVING A FILTRATION NUMBER LESS THAN 30 AS MEASURED BY STANDARD TEST A SET FORTH IN THE FOREGOING SPECIFICATION.
Claim 2
Dependent Claim
139 words
IN A PROCESS FOR PREPARING A SILICA PIGMENT WHICH INCLUDES THE STEPS OF (A) MIXING AN AQUEOUS SODIUM SILICATE SOLUTION AND CARBON DIOXIDE TO FORM A SLURRY OF WET SILICA PIGMENT, AND (B) SUBJECTING THE SAID SLURRY TO AFTER TREATMENT INCLUDING FILTERING, THE IMPROVEMENT WHICH COMPRISES: (C) CONDUCTING AT LEAST THE LATTER PART OF THE MIXING IN STEP (A) UNDER CONDITIONS OF SHEAR ESSENTIALLY AS LOW AS THAT PRODUCED BY ROTATION AT 50 R.P.M. IN A REACTOR OF 3 FOOT INSIDE DIAMETER, OF AN AGITATING ARM WHICH IS 6 INCHES ABOVE THE BOTTOM OF THE REACTOR AND 2 1/2 FEET LONG BY 1 1/2 INCHES HIGH IN CROSS SECTION, WHEREBY THERE IS PRODUCED A WET SILICA PIGMENT OF A STRUCTURE HAVING A FILTRATION NUMBER LESS THAN 30 AS MEASURED BY STANDARD TEST A SET FORTH IN THE FOREGOING SPECIFICATION.
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |