US3307906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica pigments and preparation thereof
Assignee: Individual
•
Filing: 1965-05-24
•
Granted: 1967-03-07
•
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
2026-11-04 22:30
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN THE PREPARATION OF SILICA PIGMENT BY THE ACIDULATION OF AN AQUEOUS SOLUTION OF ALKALI METAL SILICATE WITH THE AID OF CARBON DIOXIDE, THE IMPROVEMENT WHICH COMPRISES ADDING WATER ESSENTIALLY FREE OF ELECTROLYTE TO THE SOLUTION DURING THAT PART OF THE PERIOD IN THE ACIDULATION THEREOF IN WHICH THE VALUE OF X IN THE COMPOSITION OF THE ALKALI METAL SILICATE DESIGNATED BY THE FORMULA M2O(SIO2)X-WHEREIN M IS ALKALI METAL-HAS BECOME GREATER THAN 3.75; SAID WATER BEING ADDED IN THE PROPORTION OF FROM 10 PARTS TO 150 PARTS PER 100 PARTS OF WATER PRESENT JUST PRIOR TO SUCH ADDITION.
Claim 2
Dependent Claim
98 words
IN THE PREPARATION OF SILICA PIGMENT BY THE ACIDULATION OF AN AQUEOUS SOLUTION OF ALKALI METAL SILICATE WITH THE AID OF CARBON DIOXIDE, THE IMPROVEMENT WHICH COMPRISES ADDING WATER ESSENTIALLY FREE OF ELECTROLYTE TO THE SOLUTION DURING THAT PART OF THE PERIOD IN THE ACIDULATION THEREOF IN WHICH THE VALUE OF X IN THE COMPOSITION OF THE ALKALI METAL SILICATE DESIGNATED BY THE FORMULA M2O(SIO2)X-WHEREIN M IS ALKALI METAL-HAS BECOME GREATER THAN 3.75; SAID WATER BEING ADDED IN THE PROPORTION OF FROM 10 PARTS TO 150 PARTS PER 100 PARTS OF WATER PRESENT JUST PRIOR TO SUCH ADDITION.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |