US2750345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing sols of 5-8 millimicron silica particles, and product
Assignee: EIDP Inc
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Filing: 1954-02-25
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Granted: 1956-06-12
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Expires: 1974-02-25
Abstract
No abstract record available.
Inventors
- 👤 Guy B Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:30
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/148; C01B33/1485
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A WATER-CLEAR, STABLE SILICA AQUASOL CONTAINING DENSE, DISCRETE SILICA PARTICLES WHICH ARE 5 TO 8 MILLIMICRONS IN DIAMETER, SAID PARTICLE SIZE CORRESPONDING TO A SPECIFIC SURFACE AREA, A OF 350 TO 600 SQUARE METERS PER GRAM, THE SOL HAVING A SILICA CONCENTRATION, AS PER CENT SIO2, OF FROM
Claim 2
Dependent Claim
48 words
A WATER-CLEAR, STABLE SILICA AQUASOL CONTAINING DENSE, DISCRETE SILICA PARTICLES WHICH ARE 5 TO 8 MILLIMICRONS IN DIAMETER, SAID PARTICLE SIZE CORRESPONDING TO A SPECIFIC SURFACE AREA, A OF 350 TO 600 SQUARE METERS PER GRAM, THE SOL HAVING A SILICA CONCENTRATION, AS PER CENT SIO2, OF FROM
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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |